mastodon/app/models/tag.rb

# frozen_string_literal: true

class Tag < ApplicationRecord
  has_and_belongs_to_many :statuses

  HASHTAG_RE = /(?:^|[^\/\)\w])#([[:word:]_]*[[:alpha:]_][[:word:]_]*)/i

  validates :name, presence: true, uniqueness: true

  def to_param
    name
  end
end