ActiveRecord::AttributeMethods::Read::ClassMethods

    # File lib/active_record/attribute_methods/read.rb, line 34
34:         def cache_attribute?(attr_name)
35:           cached_attributes.include?(attr_name)
36:         end

    # File lib/active_record/attribute_methods/read.rb, line 22
22:         def cache_attributes(*attribute_names)
23:           attribute_names.each {|attr| cached_attributes << attr.to_s}
24:         end

    # File lib/active_record/attribute_methods/read.rb, line 28
28:         def cached_attributes
29:           @cached_attributes ||=
30:             columns.select{|c| attribute_types_cached_by_default.include?(c.type)}.map{|col| col.name}.to_set
31:         end

    # File lib/active_record/attribute_methods/read.rb, line 39
39:           def define_method_attribute(attr_name)
40:             if self.serialized_attributes[attr_name]
41:               define_read_method_for_serialized_attribute(attr_name)
42:             else
43:               define_read_method(attr_name.to_sym, attr_name, columns_hash[attr_name])
44:             end
45: 
46:             if attr_name == primary_key && attr_name != "id"
47:               define_read_method(:id, attr_name, columns_hash[attr_name])
48:             end
49:           end

    # File lib/active_record/attribute_methods/read.rb, line 58
58:           def define_read_method(symbol, attr_name, column)
59:             cast_code = column.type_cast_code('v') if column
60:             access_code = cast_code ? "(v=@attributes['#{attr_name}']) && #{cast_code}" : "@attributes['#{attr_name}']"
61: 
62:             unless attr_name.to_s == self.primary_key.to_s
63:               access_code = access_code.insert(0, "missing_attribute('#{attr_name}', caller) unless @attributes.has_key?('#{attr_name}'); ")
64:             end
65: 
66:             if cache_attribute?(attr_name)
67:               access_code = "@attributes_cache['#{attr_name}'] ||= (#{access_code})"
68:             end
69:             generated_attribute_methods.module_eval("def #{symbol}; #{access_code}; end", __FILE__, __LINE__)
70:           end

    # File lib/active_record/attribute_methods/read.rb, line 53
53:           def define_read_method_for_serialized_attribute(attr_name)
54:             generated_attribute_methods.module_eval("def #{attr_name}; unserialize_attribute('#{attr_name}'); end", __FILE__, __LINE__)
55:           end