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# frozen_string_literal: true
module ActiveRecord
module AttributeMethods
# = Active Record Attribute Methods \Read
module Read
extend ActiveSupport::Concern
module ClassMethods # :nodoc:
private
def define_method_attribute(canonical_name, owner:, as: canonical_name)
ActiveModel::AttributeMethods::AttrNames.define_attribute_accessor_method(
owner, canonical_name
) do |temp_method_name, attr_name_expr|
owner.define_cached_method(temp_method_name, as: as, namespace: :active_record) do |batch|
batch <<
"def #{temp_method_name}" <<
" _read_attribute(#{attr_name_expr}) { |n| missing_attribute(n, caller) }" <<
"end"
end
end
end
end
# Returns the value of the attribute identified by +attr_name+ after it
# has been type cast. For example, a date attribute will cast "2004-12-12"
# to <tt>Date.new(2004, 12, 12)</tt>. (For information about specific type
# casting behavior, see the types under ActiveModel::Type.)
def read_attribute(attr_name, &block)
name = attr_name.to_s
name = self.class.attribute_aliases[name] || name
@attributes.fetch_value(name, &block)
end
# This method exists to avoid the expensive primary_key check internally, without
# breaking compatibility with the read_attribute API
def _read_attribute(attr_name, &block) # :nodoc:
@attributes.fetch_value(attr_name, &block)
end
alias :attribute :_read_attribute
private :attribute
end
end
end
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