discourse/app/models/child_theme.rb

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class ChildTheme < ActiveRecord::Base
belongs_to :parent_theme, class_name: 'Theme'
belongs_to :child_theme, class_name: 'Theme'
validate :child_validations
private
def child_validations
if Theme.where(
"(component IS true AND id = :parent) OR (component IS false AND id = :child)",
parent: parent_theme_id, child: child_theme_id
).exists?
errors.add(:base, I18n.t("themes.errors.no_multilevels_components"))
end
end
end
# == Schema Information
#
# Table name: child_themes
#
# id :integer not null, primary key
# parent_theme_id :integer
# child_theme_id :integer
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# created_at :datetime not null
# updated_at :datetime not null
#
# Indexes
#
# index_child_themes_on_child_theme_id_and_parent_theme_id (child_theme_id,parent_theme_id) UNIQUE
# index_child_themes_on_parent_theme_id_and_child_theme_id (parent_theme_id,child_theme_id) UNIQUE
#