discourse/app/models/tag.rb

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class Tag < ActiveRecord::Base
validates :name, presence: true, uniqueness: true
has_many :tag_users # notification settings
has_many :topic_tags, dependent: :destroy
has_many :topics, through: :topic_tags
has_many :category_tags, dependent: :destroy
has_many :categories, through: :category_tags
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has_many :tag_group_memberships
has_many :tag_groups, through: :tag_group_memberships
def self.tags_by_count_query(opts={})
q = TopicTag.joins(:tag, :topic).group("topic_tags.tag_id, tags.name").order('count_all DESC')
q = q.limit(opts[:limit]) if opts[:limit]
q
end
def self.category_tags_by_count_query(category, opts={})
tags_by_count_query(opts).where("tags.id in (select tag_id from category_tags where category_id = ?)", category.id)
.where("topics.category_id = ?", category.id)
end
def self.top_tags(limit_arg: nil, category: nil)
limit = limit_arg || SiteSetting.max_tags_in_filter_list
tags =
if category
self.category_tags_by_count_query(category, limit: limit)
else
self.tags_by_count_query(limit: limit)
end
tags.count.map {|name, _| name}
end
def self.include_tags?
SiteSetting.tagging_enabled && SiteSetting.show_filter_by_tag
end
end
# == Schema Information
#
# Table name: tags
#
# id :integer not null, primary key
# name :string not null
# topic_count :integer default(0), not null
# created_at :datetime
# updated_at :datetime
#
# Indexes
#
# index_tags_on_name (name) UNIQUE
#