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_post_only]
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.each do |t|
@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)
.secured(@guardian)
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if latest_post_only?
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@categories = @categories
.includes(:latest_post => {:topic => :last_poster} )
.order('position ASC')
else
@categories = @categories
.order('COALESCE(categories.topics_week, 0) DESC')
.order('COALESCE(categories.topics_month, 0) DESC')
.order('COALESCE(categories.topics_year, 0) DESC')
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end
@categories = @categories.to_a
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subcategories = {}
to_delete = Set.new
@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]
end
@categories.delete_if {|c| to_delete.include?(c) }
end
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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 topics unless we can create them (so we can see the controls)
def prune_empty
unless @guardian.can_create?(Category)
# Remove categories with no featured topics unless we have the ability to edit one
@categories.delete_if { |c|
c.displayable_topics.blank? && c.description.blank?
}
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