Module: ActiveRecord::AttributeMethods::Read

Extended by:
ActiveSupport::Concern
Defined in:
activerecord/lib/active_record/attribute_methods/read.rb

Defined Under Namespace

Modules: ClassMethods

Instance Method Summary collapse

Methods included from ActiveSupport::Concern

append_features, class_methods, extended, included, prepend_features, prepended

Instance Method Details

#_read_attribute(attr_name, &block) ⇒ Object Also known as: attribute

This method exists to avoid the expensive primary_key check internally, without breaking compatibility with the read_attribute API



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# File 'activerecord/lib/active_record/attribute_methods/read.rb', line 43

def _read_attribute(attr_name, &block) # :nodoc:
  @attributes.fetch_value(attr_name, &block)
end

#read_attribute(attr_name, &block) ⇒ Object

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 Date.new(2004, 12, 12). (For information about specific type casting behavior, see the types under ActiveModel::Type.)



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# File 'activerecord/lib/active_record/attribute_methods/read.rb', line 28

def read_attribute(attr_name, &block)
  name = attr_name.to_s
  name = self.class.attribute_aliases[name] || name

  return @attributes.fetch_value(name, &block) unless name == "id" && @primary_key

  if self.class.composite_primary_key?
    @primary_key.map { |col| @attributes.fetch_value(col, &block) }
  else
    @attributes.fetch_value(@primary_key, &block)
  end
end