discourse/lib/topic_view.rb

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require_dependency 'guardian'
require_dependency 'topic_query'
require_dependency 'filter_best_posts'
require_dependency 'summarize'
require_dependency 'gaps'
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class TopicView
attr_reader :topic, :posts, :guardian, :filtered_posts
attr_accessor :draft, :draft_key, :draft_sequence
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def initialize(topic_id, user=nil, options={})
@user = user
@topic = find_topic(topic_id)
@guardian = Guardian.new(@user)
check_and_raise_exceptions
options.each do |key, value|
self.instance_variable_set("@#{key}".to_sym, value)
end
@page = @page.to_i
@page = 1 if @page.zero?
@limit ||= SiteSetting.posts_per_page
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setup_filtered_posts
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@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
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page = ((@post_number.to_i - 1) / @limit) + 1
(page > 1) ? "?page=#{page}" : ""
else
(@page && @page.to_i > 1) ? "?page=#{@page}" : ""
end
path
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end
def contains_gaps?
@contains_gaps
end
def gaps
return unless @contains_gaps
Gaps.new(filtered_post_ids, unfiltered_posts.order(:sort_order).pluck(:id))
end
def last_post
return nil if @posts.blank?
@last_post ||= @posts.last
end
def next_page
@next_page ||= begin
if last_post && (@topic.highest_post_number > last_post.post_number)
@page + 1
end
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 desired_post
return @desired_post if @desired_post.present?
return nil if posts.blank?
@desired_post = posts.detect {|p| p.post_number == @post_number.to_i}
@desired_post ||= posts.first
@desired_post
end
def summary
return nil if desired_post.blank?
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# TODO, this is actually quite slow, should be cached in the post table
Summarize.new(desired_post.cooked).summary
end
def image_url
return nil if desired_post.blank?
desired_post.user.try(: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_by_ids(opts[:post_ids]) if opts[:post_ids].present?
return filter_best(opts[:best], opts) 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)
min_idx, max_idx = get_minmax_ids(post_number)
filter_posts_in_range(min_idx, max_idx)
end
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def filter_posts_paged(page)
page = [page, 1].max
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min = @limit * (page - 1)
# Sometimes we don't care about the OP, for example when embedding comments
min = 1 if min == 0 && @exclude_first
max = (min + @limit) - 1
filter_posts_in_range(min, max)
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end
def filter_best(max, opts={})
filter = FilterBestPosts.new(@topic, @filtered_posts, max, opts)
@posts = filter.posts
@filtered_posts = filter.filtered_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 links
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@links ||= TopicLink.topic_map(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
def current_post_ids
@current_post_ids ||= if @posts.is_a?(Array)
@posts.map {|p| p.id }
else
@posts.pluck(:post_number)
end
end
def filtered_post_ids
@filtered_post_ids ||= filter_post_ids_by(:sort_order)
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
.where(topic_id: @topic.id, user_id: @user.id)
.where(post_number: current_post_ids)
.pluck(:post_number)
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post_numbers.each {|pn| result << pn}
result
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end
end
private
def filter_posts_by_ids(post_ids)
# TODO: Sort might be off
@posts = Post.where(id: post_ids)
.includes(:user)
.includes(:reply_to_user)
.order('sort_order')
@posts = @posts.with_deleted if @user.try(:staff?)
@posts
end
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
@posts = filter_posts_by_ids(filtered_post_ids[min..max])
@posts
end
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def find_topic(topic_id)
finder = Topic.where(id: topic_id).includes(:category)
finder = finder.with_deleted if @user.try(:staff?)
finder.first
end
def unfiltered_posts
result = @topic.posts
result = result.where(hidden: false) unless @user.try(:staff?)
result = result.with_deleted if @user.try(:staff?)
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
@filtered_posts = @filtered_posts.with_deleted if @user.try(:staff?)
# Filters
if @filter == 'summary'
@filtered_posts = @filtered_posts.summary
@contains_gaps = true
end
if @best.present?
@filtered_posts = @filtered_posts.where('posts.post_type <> ?', Post.types[:moderator_action])
@contains_gaps = true
end
if @username_filters.present?
usernames = @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)
@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
guardian.ensure_can_see!(@topic)
end
def filter_post_ids_by(sort_order)
@filtered_posts.order(sort_order).pluck(:id)
end
def get_minmax_ids(post_number)
# Find the closest number we have
closest_index = closest_post_to(post_number)
return nil if closest_index.nil?
# Make sure to get at least one post before, even with rounding
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posts_before = (@limit.to_f / 4).floor
posts_before = 1 if posts_before.zero?
min_idx = closest_index - posts_before
min_idx = 0 if min_idx < 0
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max_idx = min_idx + (@limit - 1)
# Get a full page even if at the end
ensure_full_page(min_idx, max_idx)
end
def ensure_full_page(min, max)
upper_limit = (filtered_post_ids.length - 1)
if max >= upper_limit
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return (upper_limit - @limit) + 1, upper_limit
else
return min, max
end
end
def closest_post_to(post_number)
closest_posts = filter_post_ids_by("@(post_number - #{post_number})")
return nil if closest_posts.empty?
filtered_post_ids.index(closest_posts.first)
end
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end