285 lines
7.8 KiB
Ruby
285 lines
7.8 KiB
Ruby
require_dependency 'guardian'
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require_dependency 'topic_query'
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require_dependency 'summarize'
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class TopicView
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attr_accessor :topic, :min, :max, :draft, :draft_key, :draft_sequence, :posts
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def initialize(topic_id, user=nil, options={})
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@topic = find_topic(topic_id)
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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.new(user).ensure_can_see!(@topic)
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@min, @max = 1, SiteSetting.posts_per_page
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@post_number, @page = options[:post_number], options[:page]
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@posts = @topic.posts
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@posts = @posts.with_deleted if user.try(:admin?)
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@posts = @posts.best_of if options[:best_of].present?
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if options[:username_filters].present?
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usernames = options[:username_filters].map{|u| u.downcase}
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@posts = @posts.where('post_number = 1 or user_id in (select u.id from users u where username_lower in (?))', usernames)
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end
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@user = user
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@initial_load = true
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@all_posts = @posts
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filter_posts(options)
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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) / SiteSetting.posts_per_page) + 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 next_page
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last_post = @posts.last
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if last_post.present? && (@topic.highest_post_number > last_post.post_number)
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(@posts[0].post_number / SiteSetting.posts_per_page) + 1
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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 summary
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return nil if posts.blank?
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Summarize.new(posts.first.cooked).summary
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end
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def image_url
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return nil if posts.blank?
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posts.first.user.small_avatar_url
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end
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def filter_posts(opts = {})
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if opts[:post_number].present?
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# Get posts near a post
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filter_posts_near(opts[:post_number].to_i)
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elsif opts[:posts_before].present?
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filter_posts_before(opts[:posts_before].to_i)
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elsif opts[:posts_after].present?
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filter_posts_after(opts[:posts_after].to_i)
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else
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# No filter? Consider it a paged view, default to page 0 which is the first segment
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filter_posts_paged(opts[:page].to_i)
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end
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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, @max = post_range(post_number)
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filter_posts_in_range(@min, @max)
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end
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def post_numbers
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@post_numbers ||= @posts.order(:post_number).pluck(:post_number)
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end
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def filter_posts_paged(page)
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page ||= 0
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min = (SiteSetting.posts_per_page * page)
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max = min + SiteSetting.posts_per_page
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max_val = (post_numbers.length - 1)
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# If we're off the charts, return nil
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return nil if min > max_val
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# Pin max to the last post
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max = max_val if max > max_val
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filter_posts_in_range(post_numbers[min], post_numbers[max])
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end
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# Filter to all posts before a particular post number
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def filter_posts_before(post_number)
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@initial_load = false
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@max = post_number - 1
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@posts = @posts.reverse_order.where("post_number < ?", post_number)
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@posts = @posts.includes(:topic).joins(:user).limit(SiteSetting.posts_per_page)
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@min = @max - @posts.size
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@min = 1 if @min < 1
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end
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# Filter to all posts after a particular post number
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def filter_posts_after(post_number)
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@initial_load = false
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@min = post_number
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@posts = @posts.regular_order.where("post_number > ?", post_number)
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@posts = @posts.includes(:topic).joins(:user).limit(SiteSetting.posts_per_page)
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@max = @min + @posts.size
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end
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def read?(post_number)
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read_posts_set.include?(post_number)
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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.where(user_id: @user.id).first
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end
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end
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def posts_count
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@posts_count ||= Post.where(topic_id: @topic.id).group(:user_id).order('count_all desc').limit(24).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: posts_count.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 voted_in_topic?
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return false
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# all post_actions is not the way to do this, cut down on the query, roll it up into topic if we need it
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@voted_in_topic ||= begin
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return false unless all_post_actions.present?
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all_post_actions.values.flatten.map {|ac| ac.keys}.flatten.include?(PostActionType.types[:vote])
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end
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end
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def post_action_visibility
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@post_action_visibility ||= begin
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result = []
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PostActionType.types.each do |k, v|
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result << v if Guardian.new(@user).can_see_post_actors?(@topic, v)
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end
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result
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end
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end
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def links
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@links ||= @topic.links_grouped
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end
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def link_counts
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@link_counts ||= TopicLinkClick.counts_for(@topic, posts)
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end
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# Binary search for closest value
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def self.closest(array, target, min, max)
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return min if max <= min
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return max if (max - min) == 1
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middle_idx = ((min + max) / 2).floor
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middle_val = array[middle_idx]
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return middle_idx if target == middle_val
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return closest(array, target, min, middle_idx) if middle_val > target
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return closest(array, target, middle_idx, max)
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end
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# Find a range of posts, allowing for gaps by deleted posts.
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def post_range(post_number)
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closest_index = TopicView.closest(post_numbers, post_number, 0, post_numbers.size - 1)
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min_idx = closest_index - (SiteSetting.posts_per_page.to_f / 4).floor
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min_idx = 0 if min_idx < 0
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max_idx = min_idx + (SiteSetting.posts_per_page - 1)
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if max_idx > (post_numbers.length - 1)
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max_idx = post_numbers.length - 1
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min_idx = max_idx - SiteSetting.posts_per_page
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min_idx = 0 if min_idx < 0
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end
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[post_numbers[min_idx], post_numbers[max_idx]]
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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 ||= @all_posts.maximum(:post_number)
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end
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def recent_posts
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@all_posts.by_newest.with_user.first(25)
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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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posts_max = @max > (topic_user.last_read_post_number || 1 ) ? (topic_user.last_read_post_number || 1) : @max
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PostTiming.select(:post_number)
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.where("topic_id = ? AND user_id = ? AND post_number BETWEEN ? AND ?",
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@topic.id, @user.id, @min, posts_max)
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.each {|t| result << t.post_number}
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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_in_range(min, max)
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@min, @max = min, max
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@posts = @posts.where("post_number between ? and ?", @min, @max).includes(:user).regular_order
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end
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def find_topic(topic_id)
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Topic.where(id: topic_id).includes(:category).first
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end
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end
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