discourse/app/models/category_list.rb

132 lines
4.7 KiB
Ruby

class CategoryList
include ActiveModel::Serialization
attr_accessor :categories,
:topic_users,
:uncategorized,
:draft,
:draft_key,
:draft_sequence
def initialize(guardian=nil)
@guardian = guardian || Guardian.new
find_relevant_topics
find_categories
prune_empty
add_uncategorized
find_user_data
end
private
# 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
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
end
# Find a list of all categories to associate the topics with
def find_categories
@categories = Category
.includes(:featured_users)
.secured(@guardian)
.order('COALESCE(categories.topics_week, 0) DESC')
.order('COALESCE(categories.topics_month, 0) DESC')
.order('COALESCE(categories.topics_year, 0) DESC')
@categories = @categories.to_a
@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
# Add the uncategorized "magic" category
def add_uncategorized
# Support for uncategorized topics
uncategorized_topics = Topic
.listable_topics
.visible
.where(category_id: nil)
.topic_list_order
.limit(SiteSetting.category_featured_topics)
if uncategorized_topics.present?
totals = Topic.exec_sql("SELECT SUM(CASE WHEN created_at >= (CURRENT_TIMESTAMP - INTERVAL '1 WEEK') THEN 1 ELSE 0 END) as topics_week,
SUM(CASE WHEN created_at >= (CURRENT_TIMESTAMP - INTERVAL '1 MONTH') THEN 1 ELSE 0 END) as topics_month,
SUM(CASE WHEN created_at >= (CURRENT_TIMESTAMP - INTERVAL '1 YEAR') THEN 1 ELSE 0 END) as topics_year,
COUNT(*) AS topic_count
FROM topics
WHERE topics.visible
AND topics.deleted_at IS NULL
AND topics.category_id IS NULL
AND topics.archetype <> '#{Archetype.private_message}'").first
uncategorized = Category.new({name: SiteSetting.uncategorized_name,
slug: Slug.for(SiteSetting.uncategorized_name),
color: SiteSetting.uncategorized_color,
text_color: SiteSetting.uncategorized_text_color,
featured_topics: uncategorized_topics}.merge(totals))
# Find the appropriate place to insert it:
insert_at = nil
@categories.each_with_index do |c, idx|
if (uncategorized.topics_week || 0) > (c.topics_week || 0)
insert_at = idx
break
end
end
@categories.insert(insert_at || @categories.size, uncategorized)
end
if uncategorized.present?
@all_topics ||= []
uncategorized.displayable_topics = uncategorized_topics
@all_topics << uncategorized_topics
@all_topics.flatten!
end
end
# 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.nil? }
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
end
end