discourse/app/models/tag.rb

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# frozen_string_literal: true
class Tag < ActiveRecord::Base
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include Searchable
include HasDestroyedWebHook
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RESERVED_TAGS = [
'none',
'constructor' # prevents issues with javascript's constructor of objects
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]
validates :name,
presence: true,
uniqueness: { case_sensitive: false }
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validate :target_tag_validator, if: Proc.new { |t| t.new_record? || t.will_save_change_to_target_tag_id? }
validate :name_validator
validates :description, length: { maximum: 280 }
scope :where_name, ->(name) do
name = Array(name).map(&:downcase)
where("lower(tags.name) IN (?)", name)
end
# tags that have never been used and don't belong to a tag group
scope :unused, -> do
where(topic_count: 0, pm_topic_count: 0)
.joins("LEFT JOIN tag_group_memberships tgm ON tags.id = tgm.tag_id")
.where("tgm.tag_id IS NULL")
end
scope :base_tags, -> { where(target_tag_id: nil) }
has_many :tag_users, dependent: :destroy # notification settings
has_many :topic_tags, dependent: :destroy
has_many :topics, through: :topic_tags
has_many :category_tag_stats, dependent: :destroy
has_many :category_tags, dependent: :destroy
has_many :categories, through: :category_tags
has_many :tag_group_memberships, dependent: :destroy
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has_many :tag_groups, through: :tag_group_memberships
belongs_to :target_tag, class_name: "Tag", optional: true
has_many :synonyms, class_name: "Tag", foreign_key: "target_tag_id", dependent: :destroy
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after_save :index_search
after_save :update_synonym_associations
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after_commit :trigger_tag_created_event, on: :create
after_commit :trigger_tag_updated_event, on: :update
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after_commit :trigger_tag_destroyed_event, on: :destroy
def self.ensure_consistency!
update_topic_counts
end
def self.update_topic_counts
DB.exec <<~SQL
UPDATE tags t
SET topic_count = x.topic_count
FROM (
SELECT COUNT(topics.id) AS topic_count, tags.id AS tag_id
FROM tags
LEFT JOIN topic_tags ON tags.id = topic_tags.tag_id
LEFT JOIN topics ON topics.id = topic_tags.topic_id
AND topics.deleted_at IS NULL
AND topics.archetype != 'private_message'
GROUP BY tags.id
) x
WHERE x.tag_id = t.id
AND x.topic_count <> t.topic_count
SQL
DB.exec <<~SQL
UPDATE tags t
SET pm_topic_count = x.pm_topic_count
FROM (
SELECT COUNT(topics.id) AS pm_topic_count, tags.id AS tag_id
FROM tags
LEFT JOIN topic_tags ON tags.id = topic_tags.tag_id
LEFT JOIN topics ON topics.id = topic_tags.topic_id
AND topics.deleted_at IS NULL
AND topics.archetype = 'private_message'
GROUP BY tags.id
) x
WHERE x.tag_id = t.id
AND x.pm_topic_count <> t.pm_topic_count
SQL
end
def self.find_by_name(name)
self.find_by('lower(name) = ?', name.downcase)
end
def self.top_tags(limit_arg: nil, category: nil, guardian: nil)
# we add 1 to max_tags_in_filter_list to efficiently know we have more tags
# than the limit. Frontend is responsible to enforce limit.
limit = limit_arg || (SiteSetting.max_tags_in_filter_list + 1)
scope_category_ids = (guardian || Guardian.new).allowed_category_ids
if category
scope_category_ids &= ([category.id] + category.subcategories.pluck(:id))
end
return [] if scope_category_ids.empty?
filter_sql = guardian&.is_staff? ? '' : " AND tags.id NOT IN (#{DiscourseTagging.hidden_tags_query.select(:id).to_sql})"
tag_names_with_counts = DB.query <<~SQL
SELECT tags.name as tag_name, SUM(stats.topic_count) AS sum_topic_count
FROM category_tag_stats stats
JOIN tags ON stats.tag_id = tags.id AND stats.topic_count > 0
WHERE stats.category_id in (#{scope_category_ids.join(',')})
#{filter_sql}
GROUP BY tags.name
ORDER BY sum_topic_count DESC, tag_name ASC
LIMIT #{limit}
SQL
tag_names_with_counts.map { |row| row.tag_name }
end
def self.pm_tags(limit: 1000, guardian: nil, allowed_user: nil)
return [] if allowed_user.blank? || !(guardian || Guardian.new).can_tag_pms?
user_id = allowed_user.id
DB.query_hash(<<~SQL).map!(&:symbolize_keys!)
SELECT tags.name as id, tags.name as text, COUNT(topics.id) AS count
FROM tags
JOIN topic_tags ON tags.id = topic_tags.tag_id
JOIN topics ON topics.id = topic_tags.topic_id
AND topics.deleted_at IS NULL
AND topics.archetype = 'private_message'
WHERE topic_tags.topic_id IN (
SELECT topic_id
FROM topic_allowed_users
WHERE user_id = #{user_id.to_i}
UNION
SELECT tg.topic_id
FROM topic_allowed_groups tg
JOIN group_users gu ON gu.user_id = #{user_id.to_i}
AND gu.group_id = tg.group_id
)
GROUP BY tags.name
ORDER BY count DESC
LIMIT #{limit.to_i}
SQL
end
def self.include_tags?
SiteSetting.tagging_enabled
end
def url
"#{Discourse.base_path}/tag/#{UrlHelper.encode_component(self.name)}"
end
def full_url
"#{Discourse.base_url}/tag/#{UrlHelper.encode_component(self.name)}"
end
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def index_search
SearchIndexer.index(self)
end
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def synonym?
!self.target_tag_id.nil?
end
def target_tag_validator
if synonyms.exists?
errors.add(:target_tag_id, I18n.t("tags.synonyms_exist"))
elsif target_tag&.synonym?
errors.add(:target_tag_id, I18n.t("tags.invalid_target_tag"))
end
end
def update_synonym_associations
if target_tag_id && saved_change_to_target_tag_id?
target_tag.tag_groups.each { |tag_group| tag_group.tags << self unless tag_group.tags.include?(self) }
target_tag.categories.each { |category| category.tags << self unless category.tags.include?(self) }
end
end
%i{
tag_created
tag_updated
tag_destroyed
}.each do |event|
define_method("trigger_#{event}_event") do
DiscourseEvent.trigger(event, self)
true
end
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end
private
def name_validator
if name.present? && RESERVED_TAGS.include?(self.name.strip.downcase)
errors.add(:name, :invalid)
end
end
end
# == Schema Information
#
# Table name: tags
#
# id :integer not null, primary key
# name :string not null
# topic_count :integer default(0), not null
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# created_at :datetime not null
# updated_at :datetime not null
# pm_topic_count :integer default(0), not null
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# target_tag_id :integer
# description :string
#
# Indexes
#
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# index_tags_on_lower_name (lower((name)::text)) UNIQUE
# index_tags_on_name (name) UNIQUE
#