discourse/lib/topic_view.rb

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require_dependency 'guardian'
require_dependency 'topic_query'
require_dependency 'summarize'
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class TopicView
attr_reader :topic, :posts, :index_offset, :index_reverse, :guardian
attr_accessor :draft, :draft_key, :draft_sequence
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def initialize(topic_id, user=nil, options={})
@topic = find_topic(topic_id)
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raise Discourse::NotFound if @topic.blank?
@guardian = Guardian.new(user)
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# 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?
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raise Discourse::NotLoggedIn.new
end
guardian.ensure_can_see!(@topic)
@post_number, @page = options[:post_number], options[:page]
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@limit = options[:limit] || SiteSetting.posts_per_page;
@filtered_posts = @topic.posts
@filtered_posts = @filtered_posts.with_deleted if user.try(:staff?)
@filtered_posts = @filtered_posts.best_of if options[:best_of].present?
@filtered_posts = @filtered_posts.where('posts.post_type <> ?', Post.types[:moderator_action]) if options[:best].present?
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if options[:username_filters].present?
usernames = options[:username_filters].map{|u| u.downcase}
@filtered_posts = @filtered_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
@user = user
@initial_load = true
@index_reverse = false
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filter_posts(options)
@draft_key = @topic.draft_key
@draft_sequence = DraftSequence.current(user, @draft_key)
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end
def canonical_path
path = @topic.relative_url
path << if @post_number
page = ((@post_number.to_i - 1) / SiteSetting.posts_per_page) + 1
(page > 1) ? "?page=#{page}" : ""
else
(@page && @page.to_i > 1) ? "?page=#{@page}" : ""
end
path
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end
def next_page
last_post = @filtered_posts.last
if last_post.present? && (@topic.highest_post_number > last_post.post_number)
(@filtered_posts[0].post_number / SiteSetting.posts_per_page) + 1
end
end
def next_page_path
"#{@topic.relative_url}?page=#{next_page}"
end
def absolute_url
"#{Discourse.base_url}#{@topic.relative_url}"
end
def relative_url
@topic.relative_url
end
def title
@topic.title
end
def filtered_posts_count
@filtered_posts_count ||= @filtered_posts.count
end
def summary
return nil if posts.blank?
Summarize.new(posts.first.cooked).summary
end
def image_url
return nil if posts.blank?
posts.first.user.small_avatar_url
end
def filter_posts(opts = {})
return filter_posts_near(opts[:post_number].to_i) if opts[:post_number].present?
return filter_posts_before(opts[:posts_before].to_i) if opts[:posts_before].present?
return filter_posts_after(opts[:posts_after].to_i) if opts[:posts_after].present?
return filter_best(opts[:best]) if opts[:best].present?
filter_posts_paged(opts[:page].to_i)
end
# Find the sort order for a post in the topic
def sort_order_for_post_number(post_number)
Post.where(topic_id: @topic.id, post_number: post_number)
.with_deleted
.select(:sort_order)
.first
.try(:sort_order)
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end
# Filter to all posts near a particular post number
def filter_posts_near(post_number)
# Find the closest number we have
closest_post_id = @filtered_posts.order("@(post_number - #{post_number})").first.try(:id)
return nil if closest_post_id.blank?
closest_index = filtered_post_ids.index(closest_post_id)
return nil if closest_index.blank?
# Make sure to get at least one post before, even with rounding
posts_before = (SiteSetting.posts_per_page.to_f / 4).floor
posts_before = 1 if posts_before == 0
min_idx = closest_index - posts_before
min_idx = 0 if min_idx < 0
max_idx = min_idx + (SiteSetting.posts_per_page - 1)
# Get a full page even if at the end
upper_limit = (filtered_post_ids.length - 1)
if max_idx >= upper_limit
max_idx = upper_limit
min_idx = (upper_limit - SiteSetting.posts_per_page) + 1
end
filter_posts_in_range(min_idx, max_idx)
end
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def filtered_post_ids
@filtered_post_ids ||= @filtered_posts.order(:sort_order).pluck(:id)
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end
def filter_posts_paged(page)
page = [page, 1].max
min = SiteSetting.posts_per_page * (page - 1)
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max = min + SiteSetting.posts_per_page
filter_posts_in_range(min, max)
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end
# Filter to all posts before a particular post number
def filter_posts_before(post_number)
@initial_load = false
sort_order = sort_order_for_post_number(post_number)
return nil unless sort_order
# Find posts before the `sort_order`
@posts = @filtered_posts.order('sort_order desc').where("sort_order < ?", sort_order)
@index_offset = @posts.count
@index_reverse = true
@posts = @posts.includes(:reply_to_user).includes(:topic).joins(:user).limit(@limit)
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end
# Filter to all posts after a particular post number
def filter_posts_after(post_number)
@initial_load = false
sort_order = sort_order_for_post_number(post_number)
return nil unless sort_order
@index_offset = @filtered_posts.where("sort_order <= ?", sort_order).count
@posts = @filtered_posts.order('sort_order').where("sort_order > ?", sort_order)
@posts = @posts.includes(:reply_to_user).includes(:topic).joins(:user).limit(@limit)
end
def filter_best(max)
@index_offset = 0
@posts = @filtered_posts.order('percent_rank asc, sort_order asc').where("post_number > 1")
@posts = @posts.includes(:reply_to_user).includes(:topic).joins(:user).limit(max)
@posts = @posts.to_a
@posts.sort!{|a,b| a.post_number <=> b.post_number}
@posts
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end
def read?(post_number)
read_posts_set.include?(post_number)
end
def topic_user
@topic_user ||= begin
return nil if @user.blank?
@topic.topic_users.where(user_id: @user.id).first
end
end
def post_counts_by_user
@post_counts_by_user ||= Post.where(topic_id: @topic.id).group(:user_id).order('count_all desc').limit(24).count
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end
def participants
@participants ||= begin
participants = {}
User.where(id: post_counts_by_user.map {|k,v| k}).each {|u| participants[u.id] = u}
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participants
end
end
def all_post_actions
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@all_post_actions ||= PostAction.counts_for(posts, @user)
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end
def voted_in_topic?
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
@voted_in_topic ||= begin
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
end
def post_action_visibility
@post_action_visibility ||= begin
result = []
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PostActionType.types.each do |k, v|
result << v if guardian.can_see_post_actors?(@topic, v)
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end
result
end
end
def links
@links ||= TopicLink.topic_summary(guardian, @topic.id)
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end
def link_counts
@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
# user post counts, etc.
def initial_load?
@initial_load
end
def suggested_topics
return nil if topic.private_message?
@suggested_topics ||= TopicQuery.new(@user).list_suggested_for(topic)
end
# 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
# the cache on topics is not correct if there are deleted posts at
# the end of the stream (for mods), nor is it correct for filtered
# streams
def highest_post_number
@highest_post_number ||= @filtered_posts.maximum(:post_number)
end
def recent_posts
@filtered_posts.by_newest.with_user.first(25)
end
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protected
def read_posts_set
@read_posts_set ||= begin
result = Set.new
return result unless @user.present?
return result unless topic_user.present?
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post_numbers = PostTiming.select(:post_number)
.where(topic_id: @topic.id, user_id: @user.id)
.where(post_number: @posts.pluck(:post_number))
.pluck(:post_number)
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post_numbers.each {|pn| result << pn}
result
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end
end
private
def filter_posts_in_range(min, max)
post_count = (filtered_post_ids.length - 1)
max = [max, post_count].min
return @posts = [] if min > max
min = [[min, max].min, 0].max
@index_offset = min
# TODO: Sort might be off
@posts = Post.where(id: filtered_post_ids[min..max])
.includes(:user)
.includes(:reply_to_user)
.order('sort_order')
@posts = @posts.with_deleted if @user.try(:staff?)
@posts
end
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def find_topic(topic_id)
Topic.where(id: topic_id).includes(:category).first
end
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end