diff options
Diffstat (limited to 'activerecord/lib/active_record/attribute_methods/read.rb')
-rw-r--r-- | activerecord/lib/active_record/attribute_methods/read.rb | 67 |
1 files changed, 33 insertions, 34 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/read.rb b/activerecord/lib/active_record/attribute_methods/read.rb index ab2ecaa7c5..30f7750884 100644 --- a/activerecord/lib/active_record/attribute_methods/read.rb +++ b/activerecord/lib/active_record/attribute_methods/read.rb @@ -6,42 +6,42 @@ module ActiveRecord module ClassMethods protected - # We want to generate the methods via module_eval rather than - # define_method, because define_method is slower on dispatch. - # Evaluating many similar methods may use more memory as the instruction - # sequences are duplicated and cached (in MRI). define_method may - # be slower on dispatch, but if you're careful about the closure - # created, then define_method will consume much less memory. - # - # But sometimes the database might return columns with - # characters that are not allowed in normal method names (like - # 'my_column(omg)'. So to work around this we first define with - # the __temp__ identifier, and then use alias method to rename - # it to what we want. - # - # We are also defining a constant to hold the frozen string of - # the attribute name. Using a constant means that we do not have - # to allocate an object on each call to the attribute method. - # Making it frozen means that it doesn't get duped when used to - # key the @attributes in read_attribute. - def define_method_attribute(name) - safe_name = name.unpack('h*'.freeze).first - temp_method = "__temp__#{safe_name}" + # We want to generate the methods via module_eval rather than + # define_method, because define_method is slower on dispatch. + # Evaluating many similar methods may use more memory as the instruction + # sequences are duplicated and cached (in MRI). define_method may + # be slower on dispatch, but if you're careful about the closure + # created, then define_method will consume much less memory. + # + # But sometimes the database might return columns with + # characters that are not allowed in normal method names (like + # 'my_column(omg)'. So to work around this we first define with + # the __temp__ identifier, and then use alias method to rename + # it to what we want. + # + # We are also defining a constant to hold the frozen string of + # the attribute name. Using a constant means that we do not have + # to allocate an object on each call to the attribute method. + # Making it frozen means that it doesn't get duped when used to + # key the @attributes in read_attribute. + def define_method_attribute(name) + safe_name = name.unpack("h*".freeze).first + temp_method = "__temp__#{safe_name}" - ActiveRecord::AttributeMethods::AttrNames.set_name_cache safe_name, name + ActiveRecord::AttributeMethods::AttrNames.set_name_cache safe_name, name - generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 - def #{temp_method} - name = ::ActiveRecord::AttributeMethods::AttrNames::ATTR_#{safe_name} - _read_attribute(name) { |n| missing_attribute(n, caller) } - end - STR + generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 + def #{temp_method} + name = ::ActiveRecord::AttributeMethods::AttrNames::ATTR_#{safe_name} + _read_attribute(name) { |n| missing_attribute(n, caller) } + end + STR - generated_attribute_methods.module_eval do - alias_method name, temp_method - undef_method temp_method + generated_attribute_methods.module_eval do + alias_method name, temp_method + undef_method temp_method + end end - end end # Returns the value of the attribute identified by <tt>attr_name</tt> after @@ -49,7 +49,7 @@ module ActiveRecord # to a date object, like Date.new(2004, 12, 12)). def read_attribute(attr_name, &block) name = attr_name.to_s - name = self.class.primary_key if name == 'id'.freeze + name = self.class.primary_key if name == "id".freeze _read_attribute(name, &block) end @@ -69,7 +69,6 @@ module ActiveRecord alias :attribute :_read_attribute private :attribute - end end end |