411 lines
10 KiB
Ruby
411 lines
10 KiB
Ruby
require_dependency 'guardian'
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require_dependency 'topic_query'
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require_dependency 'filter_best_posts'
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require_dependency 'summarize'
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require_dependency 'gaps'
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class TopicView
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attr_reader :topic, :posts, :guardian, :filtered_posts
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attr_accessor :draft, :draft_key, :draft_sequence, :user_custom_fields
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def initialize(topic_id, user=nil, options={})
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@user = user
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@guardian = Guardian.new(@user)
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@topic = find_topic(topic_id)
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check_and_raise_exceptions
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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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@page = @page.to_i
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@page = 1 if @page.zero?
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@limit ||= SiteSetting.posts_chunksize
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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 SiteSetting.public_user_custom_fields.present? && @posts
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@user_custom_fields = User.custom_fields_for_ids(@posts.map(&:user_id), SiteSetting.public_user_custom_fields.split('|'))
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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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end
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def canonical_path
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path = @topic.relative_url
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path << if @post_number
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page = ((@post_number.to_i - 1) / @limit) + 1
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(page > 1) ? "?page=#{page}" : ""
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else
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(@page && @page.to_i > 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.new(filtered_post_ids, unfiltered_posts.order(:sort_order).pluck(:id))
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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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if @page && @page > 1 && posts.length > 0
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@page - 1
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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 next_page
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@next_page ||= begin
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if last_post && (@topic.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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"#{@topic.relative_url}?page=#{prev_page}"
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else
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@topic.relative_url
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end
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end
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def next_page_path
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"#{@topic.relative_url}?page=#{next_page}"
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end
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def absolute_url
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"#{Discourse.base_url}#{@topic.relative_url}"
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end
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def relative_url
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@topic.relative_url
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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.to_i}
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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
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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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Summarize.new(desired_post.cooked).summary
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end
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def image_url
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return nil if desired_post.blank?
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desired_post.user.try(:small_avatar_url)
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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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return filter_best(opts[:best], opts) if opts[:best].present?
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filter_posts_paged(opts[:page].to_i)
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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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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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Post.where(topic_id: @topic.id, post_number: post_number)
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.with_deleted
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.select(:sort_order)
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.first
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.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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min_idx, max_idx = get_minmax_ids(post_number)
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filter_posts_in_range(min_idx, max_idx)
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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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max = (min + @limit) - 1
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filter_posts_in_range(min, max)
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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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def post_counts_by_user
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@post_counts_by_user ||= Post.where(topic_id: @topic.id)
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.group(:user_id)
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.order("count_all DESC")
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.limit(24)
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.count
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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.map {|k,v| k}).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 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 all_active_flags
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@all_active_flags ||= PostAction.active_flags_counts_for(@posts)
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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 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 suggested_topics
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return nil if topic.private_message?
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@suggested_topics ||= TopicQuery.new(@user).list_suggested_for(topic)
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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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def current_post_ids
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@current_post_ids ||= if @posts.is_a?(Array)
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@posts.map {|p| p.id }
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else
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@posts.pluck(:post_number)
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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 ||= filter_post_ids_by(:sort_order)
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end
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protected
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def read_posts_set
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@read_posts_set ||= begin
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result = Set.new
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return result unless @user.present?
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return result unless topic_user.present?
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post_numbers = PostTiming
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.where(topic_id: @topic.id, user_id: @user.id)
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.where(post_number: current_post_ids)
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.pluck(:post_number)
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post_numbers.each {|pn| result << pn}
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result
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end
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end
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private
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def filter_posts_by_ids(post_ids)
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# TODO: Sort might be off
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@posts = Post.where(id: post_ids, topic_id: @topic.id)
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.includes(:user, :reply_to_user)
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.order('sort_order')
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@posts = @posts.with_deleted if @guardian.can_see_deleted_posts?
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@posts
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end
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def filter_posts_in_range(min, max)
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post_count = (filtered_post_ids.length - 1)
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max = [max, post_count].min
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return @posts = [] if min > max
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min = [[min, max].min, 0].max
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@posts = filter_posts_by_ids(filtered_post_ids[min..max])
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@posts
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end
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def find_topic(topic_id)
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finder = Topic.where(id: topic_id).includes(:category)
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finder = finder.with_deleted if @guardian.can_see_deleted_topics?
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finder.first
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end
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def unfiltered_posts
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result = @topic.posts
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result = result.with_deleted if @guardian.can_see_deleted_posts?
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result = @topic.posts.where("user_id IS NOT NULL") if @exclude_deleted_users
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result
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end
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def setup_filtered_posts
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# Certain filters might leave gaps between posts. If that's true, we can return a gap structure
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@contains_gaps = false
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@filtered_posts = unfiltered_posts
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# Filters
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if @filter == 'summary'
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@filtered_posts = @filtered_posts.summary
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@contains_gaps = true
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end
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if @best.present?
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@filtered_posts = @filtered_posts.where('posts.post_type <> ?', Post.types[:moderator_action])
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@contains_gaps = true
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end
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# Username filters
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if @username_filters.present?
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usernames = @username_filters.map{|u| u.downcase}
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@filtered_posts = @filtered_posts.where('post_number = 1 OR posts.user_id IN (SELECT u.id FROM users u WHERE username_lower IN (?))', usernames)
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@contains_gaps = true
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end
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# Deleted
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# This should be last - don't want to tell the admin about deleted posts that clicking the button won't show
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# copy the filter for has_deleted? method
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@predelete_filtered_posts = @filtered_posts.spawn
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if @guardian.can_see_deleted_posts? && !@show_deleted && has_deleted?
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@filtered_posts = @filtered_posts.where("deleted_at IS NULL OR post_number = 1")
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@contains_gaps = true
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end
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end
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def check_and_raise_exceptions
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raise Discourse::NotFound if @topic.blank?
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# Special case: If the topic is private and the user isn't logged in, ask them
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# to log in!
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if @topic.present? && @topic.private_message? && @user.blank?
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raise Discourse::NotLoggedIn.new
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end
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guardian.ensure_can_see!(@topic)
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end
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def filter_post_ids_by(sort_order)
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@filtered_posts.order(sort_order).pluck(:id)
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end
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def get_minmax_ids(post_number)
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# Find the closest number we have
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closest_index = closest_post_to(post_number)
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return nil if closest_index.nil?
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# Make sure to get at least one post before, even with rounding
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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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min_idx = closest_index - posts_before
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min_idx = 0 if min_idx < 0
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max_idx = min_idx + (@limit - 1)
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# Get a full page even if at the end
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ensure_full_page(min_idx, max_idx)
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end
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def ensure_full_page(min, max)
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upper_limit = (filtered_post_ids.length - 1)
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if max >= upper_limit
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return (upper_limit - @limit) + 1, upper_limit
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else
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return min, max
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end
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end
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def closest_post_to(post_number)
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closest_posts = filter_post_ids_by("@(post_number - #{post_number})")
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return nil if closest_posts.empty?
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filtered_post_ids.index(closest_posts.first)
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end
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end
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