instance method
define_id_value
Ruby on Rails edge
Since edge Private — implementation detail, not part of the public APISignature
define_id_value()Composite primary key models get a real alias. Other models get a plain reader and writer, so they don’t take the alias resolution slow path, and an entry in attribute_aliases so that queries such as +where(id_value: …)+ still resolve to the id column.
Source
# File activerecord/lib/active_record/attribute_methods.rb, line 306
def define_id_value
if composite_primary_key?
alias_attribute :id_value, :id
else
target = attribute_alias("id_value")
return unless target.nil? || target == "id"
ActiveSupport::CodeGenerator.batch(generated_attribute_methods, __FILE__, __LINE__) do |owner|
define_method_attribute("id", owner: owner, as: "id_value")
send(:"define_method_attribute=", "id", owner: owner, as: "id_value")
end
self.attribute_aliases = attribute_aliases.merge("id_value" => "id").freeze unless target
end
end
Defined in activerecord/lib/active_record/attribute_methods.rb line 306
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Defined in ActiveRecord::AttributeMethods::ClassMethods