discourse/app/models/category_list.rb

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class CategoryList
include ActiveModel::Serialization
attr_accessor :categories, :topic_users, :uncategorized
def initialize(current_user)
@categories = Category
.includes(:featured_topics => [:category])
.includes(:featured_users)
.order('topics_week desc, topics_month desc, topics_year desc')
.to_a
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# Support for uncategorized topics
uncategorized_topics = Topic
.listable_topics
.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
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FROM topics
WHERE topics.visible
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AND topics.deleted_at IS NULL
AND topics.category_id IS NULL
AND topics.archetype <> '#{Archetype.private_message}'").first
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uncategorized = Category.new({name: SiteSetting.uncategorized_name,
slug: SiteSetting.uncategorized_name,
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featured_topics: uncategorized_topics}.merge(totals))
# Find the appropriate place to insert it:
insert_at = nil
@categories.each_with_index do |c, idx|
if totals['topics_week'].to_i > (c.topics_week || 0)
insert_at = idx
break
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end
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end
@categories.insert(insert_at || @categories.size, uncategorized)
end
# Remove categories with no featured topics
@categories.delete_if {|c| c.featured_topics.blank? }
# Get forum topic user records if appropriate
if current_user.present?
topics = []
@categories.each {|c| topics << c.featured_topics}
topics << @uncategorized
topics.flatten! if topics.present?
topics.compact! if topics.present?
topic_lookup = TopicUser.lookup_for(current_user, topics)
# Attach some data for serialization to each topic
topics.each {|ft| ft.user_data = topic_lookup[ft.id]}
end
end
end