discourse/app/models/category_list.rb

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class CategoryList
include ActiveModel::Serialization
attr_accessor :categories,
:topic_users,
:uncategorized,
:draft,
:draft_key,
:draft_sequence
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def initialize(guardian=nil, options = {})
@guardian = guardian || Guardian.new
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@options = options
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find_relevant_topics unless latest_post_only?
find_categories
prune_empty
find_user_data
end
private
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def latest_post_only?
@options[:latest_posts] and latest_posts_count == 1
end
def include_latest_posts?
@options[:latest_posts] and latest_posts_count > 1
end
def latest_posts_count
@options[:latest_posts].to_i > 0 ? @options[:latest_posts].to_i : SiteSetting.category_featured_topics
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end
# Retrieve a list of all the topics we'll need
def find_relevant_topics
@topics_by_category_id = {}
category_featured_topics = CategoryFeaturedTopic.select([:category_id, :topic_id]).order(:rank)
@topics_by_id = {}
@all_topics = Topic.where(id: category_featured_topics.map(&:topic_id))
@all_topics = @all_topics.includes(:last_poster) if include_latest_posts?
@all_topics.each do |t|
t.include_last_poster = true if include_latest_posts? # hint for serialization
@topics_by_id[t.id] = t
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end
category_featured_topics.each do |cft|
@topics_by_category_id[cft.category_id] ||= []
@topics_by_category_id[cft.category_id] << cft.topic_id
end
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end
# Find a list of all categories to associate the topics with
def find_categories
@categories = Category
.includes(:featured_users, subcategories: [:topic_only_relative_url])
.secured(@guardian)
.order('position asc')
.order('COALESCE(categories.posts_week, 0) DESC')
.order('COALESCE(categories.posts_month, 0) DESC')
.order('COALESCE(categories.posts_year, 0) DESC')
.to_a
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if latest_post_only?
@categories = @categories.includes(:latest_post => {:topic => :last_poster} )
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end
subcategories = {}
to_delete = Set.new
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@categories.each do |c|
if c.parent_category_id.present?
subcategories[c.parent_category_id] ||= []
subcategories[c.parent_category_id] << c.id
to_delete << c
end
end
if subcategories.present?
@categories.each do |c|
c.subcategory_ids = subcategories[c.id]
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end
@categories.delete_if {|c| to_delete.include?(c) }
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end
if latest_post_only?
@all_topics = []
@categories.each do |c|
if c.latest_post && c.latest_post.topic
c.displayable_topics = [c.latest_post.topic]
topic = c.latest_post.topic
topic.include_last_poster = true # hint for serialization
@all_topics << topic
end
end
end
if @topics_by_category_id
@categories.each do |c|
topics_in_cat = @topics_by_category_id[c.id]
if topics_in_cat.present?
c.displayable_topics = []
topics_in_cat.each do |topic_id|
topic = @topics_by_id[topic_id]
if topic.present?
topic.category = c
c.displayable_topics << topic
end
end
end
end
end
end
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# Remove any empty categories unless we can create them (so we can see the controls)
def prune_empty
if !@guardian.can_create?(Category)
# Remove categories with no featured topics unless we have the ability to edit one
@categories.delete_if do |c|
c.displayable_topics.blank? && c.description.blank?
end
elsif !SiteSetting.allow_uncategorized_topics
# Don't show uncategorized to admins either, if uncategorized topics are not allowed
# and there are none.
@categories.delete_if do |c|
c.uncategorized? && c.displayable_topics.blank?
end
end
end
# Get forum topic user records if appropriate
def find_user_data
if @guardian.current_user && @all_topics.present?
topic_lookup = TopicUser.lookup_for(@guardian.current_user, @all_topics)
# Attach some data for serialization to each topic
@all_topics.each { |ft| ft.user_data = topic_lookup[ft.id] }
end
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end
end