779 lines
20 KiB
Ruby
779 lines
20 KiB
Ruby
# frozen_string_literal: true
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class TopicView
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MEGA_TOPIC_POSTS_COUNT = 10000
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MIN_POST_READ_TIME = 4.0
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attr_reader(
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:topic,
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:posts,
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:guardian,
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:filtered_posts,
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:chunk_size,
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:print,
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:message_bus_last_id,
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:queued_posts_enabled,
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:personal_message,
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:can_review_topic
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)
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attr_accessor(
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:draft,
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:draft_key,
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:draft_sequence,
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:user_custom_fields,
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:post_custom_fields,
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:post_number
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)
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def self.print_chunk_size
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1000
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end
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def self.chunk_size
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20
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end
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def self.default_post_custom_fields
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@default_post_custom_fields ||= [Post::NOTICE_TYPE, Post::NOTICE_ARGS, "action_code_who", "requested_group_id"]
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end
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def self.post_custom_fields_whitelisters
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@post_custom_fields_whitelisters ||= Set.new
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end
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def self.add_post_custom_fields_whitelister(&block)
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post_custom_fields_whitelisters << block
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end
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def self.whitelisted_post_custom_fields(user)
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wpcf = default_post_custom_fields + post_custom_fields_whitelisters.map { |w| w.call(user) }
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wpcf.flatten.uniq
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end
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def initialize(topic_or_topic_id, user = nil, options = {})
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@topic = find_topic(topic_or_topic_id)
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@user = user
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@guardian = Guardian.new(@user)
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check_and_raise_exceptions
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@message_bus_last_id = MessageBus.last_id("/topic/#{@topic.id}")
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@print = options[:print].present?
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options.each do |key, value|
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self.instance_variable_set("@#{key}".to_sym, value)
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end
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@post_number = [@post_number.to_i, 1].max
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@page = [@page.to_i, 1].max
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@include_suggested = options.fetch(:include_suggested) { true }
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@include_related = options.fetch(:include_related) { true }
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@chunk_size =
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case
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when @print then TopicView.print_chunk_size
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else TopicView.chunk_size
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end
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@limit ||= @chunk_size
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setup_filtered_posts
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@initial_load = true
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@index_reverse = false
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filter_posts(options)
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if @posts && !@skip_custom_fields
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if (added_fields = User.whitelisted_user_custom_fields(@guardian)).present?
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@user_custom_fields = User.custom_fields_for_ids(@posts.pluck(:user_id), added_fields)
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end
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if (whitelisted_fields = TopicView.whitelisted_post_custom_fields(@user)).present?
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@post_custom_fields = Post.custom_fields_for_ids(@posts.pluck(:id), whitelisted_fields)
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end
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end
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@draft_key = @topic.draft_key
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@draft_sequence = DraftSequence.current(@user, @draft_key)
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@can_review_topic = @guardian.can_review_topic?(@topic)
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@queued_posts_enabled = NewPostManager.queue_enabled?
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@personal_message = @topic.private_message?
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end
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def show_read_indicator?
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return false unless @user || topic.private_message?
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topic.allowed_groups.any? do |group|
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group.publish_read_state? && group.users.include?(@user)
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end
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end
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def canonical_path
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path = relative_url.dup
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path <<
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if @page > 1
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"?page=#{@page}"
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else
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page = ((@post_number - 1) / @limit) + 1
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page > 1 ? "?page=#{page}" : ""
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end
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path
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end
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def contains_gaps?
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@contains_gaps
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end
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def gaps
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return unless @contains_gaps
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@gaps ||= begin
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if is_mega_topic?
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nil
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else
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Gaps.new(filtered_post_ids, unfiltered_posts.order(:sort_order).pluck(:id))
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end
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end
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end
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def last_post
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return nil if @posts.blank?
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@last_post ||= @posts.last
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end
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def prev_page
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@page > 1 && posts.size > 0 ? @page - 1 : nil
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end
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def next_page
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@next_page ||= begin
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if last_post && highest_post_number && (highest_post_number > last_post.post_number)
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@page + 1
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end
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end
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end
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def prev_page_path
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if prev_page > 1
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"#{relative_url}?page=#{prev_page}"
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else
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relative_url
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end
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end
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def next_page_path
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"#{relative_url}?page=#{next_page}"
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end
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def absolute_url
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"#{Discourse.base_url_no_prefix}#{relative_url}"
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end
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def relative_url
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"#{@topic.relative_url}#{@print ? '/print' : ''}"
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end
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def page_title
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title = @topic.title
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if SiteSetting.topic_page_title_includes_category
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if @topic.category_id != SiteSetting.uncategorized_category_id && @topic.category_id && @topic.category
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title += " - #{@topic.category.name}"
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elsif SiteSetting.tagging_enabled && @topic.tags.exists?
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title += " - #{@topic.tags.order('tags.topic_count DESC').first.name}"
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end
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end
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title
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end
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def title
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@topic.title
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end
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def desired_post
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return @desired_post if @desired_post.present?
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return nil if posts.blank?
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@desired_post = posts.detect { |p| p.post_number == @post_number }
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@desired_post ||= posts.first
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@desired_post
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end
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def summary(opts = {})
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return nil if desired_post.blank?
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# TODO, this is actually quite slow, should be cached in the post table
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excerpt = desired_post.excerpt(500, opts.merge(strip_links: true, text_entities: true))
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(excerpt || "").gsub(/\n/, ' ').strip
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end
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def read_time
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return nil if @post_number > 1 # only show for topic URLs
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if @topic.word_count && SiteSetting.read_time_word_count > 0
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[
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@topic.word_count / SiteSetting.read_time_word_count,
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@topic.posts_count * MIN_POST_READ_TIME / 60
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].max.ceil
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end
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end
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def like_count
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return nil if @post_number > 1 # only show for topic URLs
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@topic.like_count
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end
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def published_time
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return nil if desired_post.blank?
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if desired_post.wiki && desired_post.post_number == 1 && desired_post.revisions.size > 0
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desired_post.revisions.last.updated_at.strftime('%FT%T%:z')
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else
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desired_post.created_at.strftime('%FT%T%:z')
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end
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end
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def image_url
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if @post_number > 1 && @desired_post.present?
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if @desired_post.image_url.present?
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@desired_post.image_url
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elsif @desired_post.user
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# show poster avatar
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@desired_post.user.avatar_template_url.gsub("{size}", "200")
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end
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else
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@topic.image_url
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end
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end
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def filter_posts(opts = {})
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return filter_posts_near(opts[:post_number].to_i) if opts[:post_number].present?
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return filter_posts_by_ids(opts[:post_ids]) if opts[:post_ids].present?
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if opts[:filter_post_number].present?
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return filter_posts_by_post_number(opts[:filter_post_number], opts[:asc])
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end
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return filter_best(opts[:best], opts) if opts[:best].present?
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filter_posts_paged(@page)
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end
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def primary_group_names
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return @group_names if @group_names
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primary_group_ids = Set.new
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@posts.each do |p|
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primary_group_ids << p.user.primary_group_id if p.user.try(:primary_group_id)
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end
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result = {}
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unless primary_group_ids.empty?
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Group.where(id: primary_group_ids.to_a).pluck(:id, :name).each do |g|
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result[g[0]] = g[1]
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end
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end
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@group_names = result
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end
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# Find the sort order for a post in the topic
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def sort_order_for_post_number(post_number)
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posts = Post.where(topic_id: @topic.id, post_number: post_number).with_deleted
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posts = filter_post_types(posts)
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posts.select(:sort_order).first.try(:sort_order)
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end
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# Filter to all posts near a particular post number
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def filter_posts_near(post_number)
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posts_before = (@limit.to_f / 4).floor
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posts_before = 1 if posts_before.zero?
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sort_order = get_sort_order(post_number)
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before_post_ids = @filtered_posts.order(sort_order: :desc)
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.where("posts.sort_order < ?", sort_order)
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.limit(posts_before)
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.pluck(:id)
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post_ids = before_post_ids + @filtered_posts.order(sort_order: :asc)
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.where("posts.sort_order >= ?", sort_order)
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.limit(@limit - before_post_ids.length)
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.pluck(:id)
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if post_ids.length < @limit
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post_ids = post_ids + @filtered_posts.order(sort_order: :desc)
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.where("posts.sort_order < ?", sort_order)
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.offset(before_post_ids.length)
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.limit(@limit - post_ids.length)
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.pluck(:id)
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end
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filter_posts_by_ids(post_ids)
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end
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def filter_posts_paged(page)
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page = [page, 1].max
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min = @limit * (page - 1)
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# Sometimes we don't care about the OP, for example when embedding comments
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min = 1 if min == 0 && @exclude_first
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@posts = filter_posts_by_ids(
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@filtered_posts.order(:sort_order)
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.offset(min)
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.limit(@limit)
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.pluck(:id)
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)
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end
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def filter_best(max, opts = {})
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filter = FilterBestPosts.new(@topic, @filtered_posts, max, opts)
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@posts = filter.posts
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@filtered_posts = filter.filtered_posts
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end
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def read?(post_number)
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return true unless @user
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read_posts_set.include?(post_number)
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end
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def has_deleted?
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@predelete_filtered_posts.with_deleted
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.where("posts.deleted_at IS NOT NULL")
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.where("posts.post_number > 1")
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.exists?
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end
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def topic_user
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@topic_user ||= begin
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return nil if @user.blank?
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@topic.topic_users.find_by(user_id: @user.id)
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end
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end
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MAX_PARTICIPANTS = 24
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def post_counts_by_user
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@post_counts_by_user ||= begin
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if is_mega_topic?
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{}
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else
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post_ids = unfiltered_post_ids
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return {} if post_ids.blank?
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sql = <<~SQL
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SELECT user_id, count(*) AS count_all
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FROM posts
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WHERE id in (:post_ids)
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AND user_id IS NOT NULL
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GROUP BY user_id
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ORDER BY count_all DESC
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LIMIT #{MAX_PARTICIPANTS}
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SQL
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Hash[*DB.query_single(sql, post_ids: post_ids)]
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end
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end
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end
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# if a topic has more that N posts no longer attempt to
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# get accurate participant count, instead grab cached count
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# from topic
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MAX_POSTS_COUNT_PARTICIPANTS = 500
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def participant_count
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@participant_count ||=
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begin
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if participants.size == MAX_PARTICIPANTS
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if @topic.posts_count > MAX_POSTS_COUNT_PARTICIPANTS
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@topic.participant_count
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else
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sql = <<~SQL
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SELECT COUNT(DISTINCT user_id)
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FROM posts
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WHERE id IN (:post_ids)
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AND user_id IS NOT NULL
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SQL
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DB.query_single(sql, post_ids: unfiltered_post_ids).first.to_i
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end
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else
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participants.size
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end
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end
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end
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def participants
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@participants ||= begin
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participants = {}
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User.where(id: post_counts_by_user.keys).includes(:primary_group).each { |u| participants[u.id] = u }
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participants
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end
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end
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def group_allowed_user_ids
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return @group_allowed_user_ids unless @group_allowed_user_ids.nil?
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group_ids = @topic.allowed_groups.map(&:id)
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@group_allowed_user_ids = Set.new(GroupUser.where(group_id: group_ids).pluck('distinct user_id'))
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end
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def all_post_actions
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@all_post_actions ||= PostAction.counts_for(@posts, @user)
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end
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def links
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@links ||= TopicLink.topic_map(@guardian, @topic.id)
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end
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def user_post_bookmarks
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@user_post_bookmarks ||= Bookmark.where(user: @user, post_id: unfiltered_post_ids)
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end
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def reviewable_counts
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if @reviewable_counts.nil?
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post_ids = @posts.map(&:id)
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sql = <<~SQL
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SELECT target_id,
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MAX(r.id) reviewable_id,
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COUNT(*) total,
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SUM(CASE WHEN s.status = :pending THEN 1 ELSE 0 END) pending
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FROM reviewables r
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JOIN reviewable_scores s ON reviewable_id = r.id
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WHERE r.target_id IN (:post_ids) AND
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r.target_type = 'Post'
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GROUP BY target_id
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SQL
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@reviewable_counts = {}
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DB.query(
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sql,
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pending: ReviewableScore.statuses[:pending],
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post_ids: post_ids
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).each do |row|
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@reviewable_counts[row.target_id] = {
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total: row.total,
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pending: row.pending,
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reviewable_id: row.reviewable_id
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}
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end
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end
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@reviewable_counts
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end
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def pending_posts
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@pending_posts ||= ReviewableQueuedPost.pending.where(created_by: @user, topic: @topic).order(:created_at)
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end
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def actions_summary
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return @actions_summary unless @actions_summary.nil?
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@actions_summary = []
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return @actions_summary unless post = posts&.first
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PostActionType.topic_flag_types.each do |sym, id|
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@actions_summary << {
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id: id,
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count: 0,
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hidden: false,
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can_act: @guardian.post_can_act?(post, sym)
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}
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end
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@actions_summary
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end
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def link_counts
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@link_counts ||= TopicLink.counts_for(@guardian, @topic, posts)
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end
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# Are we the initial page load? If so, we can return extra information like
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# user post counts, etc.
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def initial_load?
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@initial_load
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end
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def pm_params
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@pm_params ||= TopicQuery.new(@user).get_pm_params(topic)
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end
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def suggested_topics
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if @include_suggested
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@suggested_topics ||= TopicQuery.new(@user).list_suggested_for(topic, pm_params: pm_params)
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else
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nil
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end
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end
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def related_messages
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if @include_related
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@related_messages ||= TopicQuery.new(@user).list_related_for(topic, pm_params: pm_params)
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else
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nil
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end
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end
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# This is pending a larger refactor, that allows custom orders
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# for now we need to look for the highest_post_number in the stream
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# the cache on topics is not correct if there are deleted posts at
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# the end of the stream (for mods), nor is it correct for filtered
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# streams
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def highest_post_number
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@highest_post_number ||= @filtered_posts.maximum(:post_number)
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end
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def recent_posts
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@filtered_posts.by_newest.with_user.first(25)
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end
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# Returns an array of [id, days_ago] tuples.
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# `days_ago` is there for the timeline calculations.
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def filtered_post_stream
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@filtered_post_stream ||= begin
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posts = @filtered_posts
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.order(:sort_order)
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columns = [:id]
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if !is_mega_topic?
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columns << 'EXTRACT(DAYS FROM CURRENT_TIMESTAMP - created_at)::INT AS days_ago'
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end
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posts.pluck(*columns)
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end
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end
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def filtered_post_ids
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@filtered_post_ids ||= filtered_post_stream.map do |tuple|
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if is_mega_topic?
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tuple
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else
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tuple[0]
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end
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end
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end
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def unfiltered_post_ids
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@unfiltered_post_ids ||=
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begin
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if @contains_gaps
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unfiltered_posts.pluck(:id)
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else
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filtered_post_ids
|
|
end
|
|
end
|
|
end
|
|
|
|
def filtered_post_id(post_number)
|
|
@filtered_posts.where(post_number: post_number).pluck_first(:id)
|
|
end
|
|
|
|
def is_mega_topic?
|
|
@is_mega_topic ||= (@topic.posts_count >= MEGA_TOPIC_POSTS_COUNT)
|
|
end
|
|
|
|
def first_post_id
|
|
@filtered_posts.order(sort_order: :asc).pluck_first(:id)
|
|
end
|
|
|
|
def last_post_id
|
|
@filtered_posts.order(sort_order: :desc).pluck_first(:id)
|
|
end
|
|
|
|
def current_post_number
|
|
if highest_post_number.present?
|
|
post_number > highest_post_number ? highest_post_number : post_number
|
|
end
|
|
end
|
|
|
|
def queued_posts_count
|
|
ReviewableQueuedPost.viewable_by(@user).where(topic_id: @topic.id).pending.count
|
|
end
|
|
|
|
protected
|
|
|
|
def read_posts_set
|
|
@read_posts_set ||= begin
|
|
result = Set.new
|
|
return result unless @user.present?
|
|
return result unless topic_user.present?
|
|
|
|
post_numbers = PostTiming
|
|
.where(topic_id: @topic.id, user_id: @user.id)
|
|
.where(post_number: @posts.pluck(:post_number))
|
|
.pluck(:post_number)
|
|
|
|
post_numbers.each { |pn| result << pn }
|
|
result
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
def get_sort_order(post_number)
|
|
sql = <<~SQL
|
|
SELECT posts.sort_order
|
|
FROM posts
|
|
WHERE posts.post_number = #{post_number.to_i}
|
|
AND posts.topic_id = #{@topic.id.to_i}
|
|
LIMIT 1
|
|
SQL
|
|
|
|
sort_order = DB.query_single(sql).first
|
|
|
|
if !sort_order
|
|
sql = <<~SQL
|
|
SELECT posts.sort_order
|
|
FROM posts
|
|
WHERE posts.topic_id = #{@topic.id.to_i}
|
|
ORDER BY @(post_number - #{post_number.to_i})
|
|
LIMIT 1
|
|
SQL
|
|
|
|
sort_order = DB.query_single(sql).first
|
|
end
|
|
|
|
sort_order
|
|
end
|
|
|
|
def filter_post_types(posts)
|
|
visible_types = Topic.visible_post_types(@user)
|
|
|
|
if @user.present?
|
|
posts.where("posts.user_id = ? OR post_type IN (?)", @user.id, visible_types)
|
|
else
|
|
posts.where(post_type: visible_types)
|
|
end
|
|
end
|
|
|
|
def filter_posts_by_post_number(post_number, asc)
|
|
sort_order = get_sort_order(post_number)
|
|
|
|
posts =
|
|
if asc
|
|
@filtered_posts
|
|
.where("sort_order > ?", sort_order)
|
|
.order(sort_order: :asc)
|
|
else
|
|
@filtered_posts
|
|
.where("sort_order < ?", sort_order)
|
|
.order(sort_order: :desc)
|
|
end
|
|
|
|
posts = posts.limit(@limit) if !@skip_limit
|
|
filter_posts_by_ids(posts.pluck(:id))
|
|
|
|
@posts = @posts.unscope(:order).order(sort_order: :desc) if !asc
|
|
end
|
|
|
|
def filter_posts_by_ids(post_ids)
|
|
# TODO: Sort might be off
|
|
@posts = Post.where(id: post_ids, topic_id: @topic.id)
|
|
.includes({ user: :primary_group }, :reply_to_user, :deleted_by, :incoming_email, :topic)
|
|
.order('sort_order')
|
|
@posts = filter_post_types(@posts)
|
|
@posts = @posts.with_deleted if @guardian.can_see_deleted_posts?
|
|
@posts
|
|
end
|
|
|
|
def find_topic(topic_or_topic_id)
|
|
if topic_or_topic_id.is_a?(Topic)
|
|
topic_or_topic_id
|
|
else
|
|
# with_deleted covered in #check_and_raise_exceptions
|
|
finder = Topic.with_deleted.where(id: topic_or_topic_id).includes(:category)
|
|
finder.first
|
|
end
|
|
end
|
|
|
|
def unfiltered_posts
|
|
result = filter_post_types(@topic.posts)
|
|
result = result.with_deleted if @guardian.can_see_deleted_posts?
|
|
result = result.where("user_id IS NOT NULL") if @exclude_deleted_users
|
|
result = result.where(hidden: false) if @exclude_hidden
|
|
result
|
|
end
|
|
|
|
def setup_filtered_posts
|
|
# Certain filters might leave gaps between posts. If that's true, we can return a gap structure
|
|
@contains_gaps = false
|
|
@filtered_posts = unfiltered_posts
|
|
|
|
sql = <<~SQL
|
|
SELECT ignored_user_id
|
|
FROM ignored_users as ig
|
|
JOIN users as u ON u.id = ig.ignored_user_id
|
|
WHERE ig.user_id = :current_user_id
|
|
AND ig.ignored_user_id <> :current_user_id
|
|
AND NOT u.admin
|
|
AND NOT u.moderator
|
|
SQL
|
|
|
|
ignored_user_ids = DB.query_single(sql, current_user_id: @user&.id)
|
|
|
|
if ignored_user_ids.present?
|
|
@filtered_posts = @filtered_posts.where.not("user_id IN (?) AND id <> ?", ignored_user_ids, first_post_id)
|
|
@contains_gaps = true
|
|
end
|
|
|
|
# Filters
|
|
if @filter == 'summary'
|
|
@filtered_posts = @filtered_posts.summary(@topic.id)
|
|
@contains_gaps = true
|
|
end
|
|
|
|
if @best.present?
|
|
@filtered_posts = @filtered_posts.where('posts.post_type = ?', Post.types[:regular])
|
|
@contains_gaps = true
|
|
end
|
|
|
|
# Username filters
|
|
if @username_filters.present?
|
|
usernames = @username_filters.map { |u| u.downcase }
|
|
|
|
@filtered_posts = @filtered_posts.where('
|
|
posts.post_number = 1
|
|
OR posts.user_id IN (SELECT u.id FROM users u WHERE u.username_lower IN (?))
|
|
', usernames)
|
|
|
|
@contains_gaps = true
|
|
end
|
|
|
|
# Deleted
|
|
# This should be last - don't want to tell the admin about deleted posts that clicking the button won't show
|
|
# copy the filter for has_deleted? method
|
|
@predelete_filtered_posts = @filtered_posts.spawn
|
|
|
|
if @guardian.can_see_deleted_posts? && !@show_deleted && has_deleted?
|
|
@filtered_posts = @filtered_posts.where(
|
|
"posts.deleted_at IS NULL OR posts.post_number = 1"
|
|
)
|
|
|
|
@contains_gaps = true
|
|
end
|
|
|
|
end
|
|
|
|
def check_and_raise_exceptions
|
|
raise Discourse::NotFound if @topic.blank?
|
|
# Special case: If the topic is private and the user isn't logged in, ask them
|
|
# to log in!
|
|
if @topic.present? && @topic.private_message? && @user.blank?
|
|
raise Discourse::NotLoggedIn.new
|
|
end
|
|
# can user see this topic?
|
|
raise Discourse::InvalidAccess.new("can't see #{@topic}", @topic) unless @guardian.can_see?(@topic)
|
|
# log personal message views
|
|
if SiteSetting.log_personal_messages_views && @topic.present? && @topic.private_message? && @topic.all_allowed_users.where(id: @user.id).blank?
|
|
unless UserHistory.where(acting_user_id: @user.id, action: UserHistory.actions[:check_personal_message], topic_id: @topic.id).where("created_at > ?", 1.hour.ago).exists?
|
|
StaffActionLogger.new(@user).log_check_personal_message(@topic)
|
|
end
|
|
end
|
|
end
|
|
end
|