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# frozen_string_literal: true
module Decidim
# Categories serve as a taxonomy for components to use for while in the
# context of a participatory process.
class Category < ApplicationRecord
belongs_to :participatory_process, foreign_key: "decidim_participatory_process_id", class_name: "Decidim::ParticipatoryProcess", inverse_of: :categories
has_many :subcategories, foreign_key: "parent_id", class_name: "Decidim::Category", dependent: :destroy, inverse_of: :parent
belongs_to :parent, class_name: "Decidim::Category", foreign_key: "parent_id", inverse_of: :subcategories, optional: true
has_many :categorizations, foreign_key: "decidim_category_id", class_name: "Decidim::Categorization", dependent: :destroy
validate :forbid_deep_nesting
before_validation :subcategories_have_same_process
# Scope to return only the first-class categories, that is, those that are
# not subcategories.
#
# Returns an ActiveRecord::Relation.
def self.first_class
where(parent_id: nil)
end
def unused?
categorizations.empty?
end
private
def forbid_deep_nesting
return unless parent
return unless parent.parent.present?
errors.add(:parent_id, :nesting_too_deep)
end
def subcategories_have_same_process
return unless parent
self.participatory_process = parent.participatory_process
end
end
end
Version data entries
12 entries across 12 versions & 2 rubygems