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# frozen_string_literal: true
# == Schema Information
#
# Table name: tags
#
# id :bigint(8) not null, primary key
# name :string default(""), not null
# created_at :datetime not null
# updated_at :datetime not null
# usable :boolean
# trendable :boolean
# listable :boolean
# reviewed_at :datetime
# requested_review_at :datetime
# last_status_at :datetime
# max_score :float
# max_score_at :datetime
# display_name :string
#
class Tag < ApplicationRecord
has_and_belongs_to_many :statuses
has_and_belongs_to_many :accounts
has_many :passive_relationships, class_name: 'TagFollow', inverse_of: :tag, dependent: :destroy
has_many :featured_tags, dependent: :destroy, inverse_of: :tag
has_many :followers, through: :passive_relationships, source: :account
HASHTAG_SEPARATORS = "_\u00B7\u30FB\u200c"
HASHTAG_FIRST_SEQUENCE_CHUNK_ONE = "[[:word:]_][[:word:]#{HASHTAG_SEPARATORS}]*[[:alpha:]#{HASHTAG_SEPARATORS}]"
HASHTAG_FIRST_SEQUENCE_CHUNK_TWO = "[[:word:]#{HASHTAG_SEPARATORS}]*[[:word:]_]"
HASHTAG_FIRST_SEQUENCE = "(#{HASHTAG_FIRST_SEQUENCE_CHUNK_ONE}#{HASHTAG_FIRST_SEQUENCE_CHUNK_TWO})"
HASTAG_LAST_SEQUENCE = '([[:word:]_]*[[:alpha:]][[:word:]_]*)'
HASHTAG_NAME_PAT = "#{HASHTAG_FIRST_SEQUENCE}|#{HASTAG_LAST_SEQUENCE}"
HASHTAG_RE = /(?:^|[^\/\)\w])#(#{HASHTAG_NAME_PAT})/i
HASHTAG_NAME_RE = /\A(#{HASHTAG_NAME_PAT})\z/i
HASHTAG_INVALID_CHARS_RE = /[^[:alnum:]#{HASHTAG_SEPARATORS}]/
validates :name, presence: true, format: { with: HASHTAG_NAME_RE }
validates :display_name, format: { with: HASHTAG_NAME_RE }
validate :validate_name_change, if: -> { !new_record? && name_changed? }
validate :validate_display_name_change, if: -> { !new_record? && display_name_changed? }
scope :reviewed, -> { where.not(reviewed_at: nil) }
scope :unreviewed, -> { where(reviewed_at: nil) }
scope :pending_review, -> { unreviewed.where.not(requested_review_at: nil) }
scope :usable, -> { where(usable: [true, nil]) }
scope :listable, -> { where(listable: [true, nil]) }
scope :trendable, -> { Setting.trendable_by_default ? where(trendable: [true, nil]) : where(trendable: true) }
scope :not_trendable, -> { where(trendable: false) }
scope :recently_used, lambda { |account|
joins(:statuses)
.where(statuses: { id: account.statuses.select(:id).limit(1000) })
.group(:id).order(Arel.sql('count(*) desc'))
}
scope :matches_name, ->(term) { where(arel_table[:name].lower.matches(arel_table.lower("#{sanitize_sql_like(Tag.normalize(term))}%"), nil, true)) } # Search with case-sensitive to use B-tree index
update_index('tags', :self)
def to_param
name
end
def display_name
attributes['display_name'] || name
end
def usable
boolean_with_default('usable', true)
end
alias usable? usable
def listable
boolean_with_default('listable', true)
end
alias listable? listable
def trendable
boolean_with_default('trendable', Setting.trendable_by_default)
end
alias trendable? trendable
def requires_review?
reviewed_at.nil?
end
def reviewed?
reviewed_at.present?
end
def requested_review?
requested_review_at.present?
end
def requires_review_notification?
requires_review? && !requested_review?
end
def decaying?
max_score_at && max_score_at >= Trends.tags.options[:max_score_cooldown].ago && max_score_at < 1.day.ago
end
def history
@history ||= Trends::History.new('tags', id)
end
class << self
def find_or_create_by_names(name_or_names)
names = Array(name_or_names).map { |str| [normalize(str), str] }.uniq(&:first)
names.map do |(normalized_name, display_name)|
tag = matching_name(normalized_name).first || create(name: normalized_name,
display_name: display_name.gsub(HASHTAG_INVALID_CHARS_RE, ''))
yield tag if block_given?
tag
end
end
def search_for(term, limit = 5, offset = 0, options = {})
stripped_term = term.strip
query = Tag.listable.matches_name(stripped_term)
query = query.merge(matching_name(stripped_term).or(where.not(reviewed_at: nil))) if options[:exclude_unreviewed]
query.order(Arel.sql('length(name) ASC, name ASC'))
.limit(limit)
.offset(offset)
end
def find_normalized(name)
matching_name(name).first
end
def find_normalized!(name)
find_normalized(name) || raise(ActiveRecord::RecordNotFound)
end
def matching_name(name_or_names)
names = Array(name_or_names).map { |name| arel_table.lower(normalize(name)) }
if names.size == 1
where(arel_table[:name].lower.eq(names.first))
else
where(arel_table[:name].lower.in(names))
end
end
def normalize(str)
HashtagNormalizer.new.normalize(str)
end
end
private
def validate_name_change
errors.add(:name, I18n.t('tags.does_not_match_previous_name')) unless name_was.mb_chars.casecmp(name.mb_chars).zero?
end
def validate_display_name_change
unless HashtagNormalizer.new.normalize(display_name).casecmp(name.mb_chars).zero?
errors.add(:display_name,
I18n.t('tags.does_not_match_previous_name'))
end
end
end
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