diff options
Diffstat (limited to 'activerecord/lib/active_record/attribute_methods/read.rb')
| -rw-r--r-- | activerecord/lib/active_record/attribute_methods/read.rb | 43 |
1 files changed, 10 insertions, 33 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/read.rb b/activerecord/lib/active_record/attribute_methods/read.rb index 903fe86e04..ff0e863529 100644 --- a/activerecord/lib/active_record/attribute_methods/read.rb +++ b/activerecord/lib/active_record/attribute_methods/read.rb @@ -8,42 +8,19 @@ module ActiveRecord module ClassMethods # :nodoc: private - # 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.unpack1("h*") - temp_method = "__temp__#{safe_name}" - - ActiveRecord::AttributeMethods::AttrNames.set_name_cache safe_name, name sync_with_transaction_state = "sync_with_transaction_state" if name == primary_key - generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 - def #{temp_method} - #{sync_with_transaction_state} - 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 + ActiveModel::AttributeMethods::AttrNames.define_attribute_accessor_method( + generated_attribute_methods, name + ) do |temp_method_name, attr_name_expr| + generated_attribute_methods.module_eval <<-RUBY, __FILE__, __LINE__ + 1 + def #{temp_method_name} + #{sync_with_transaction_state} + name = #{attr_name_expr} + _read_attribute(name) { |n| missing_attribute(n, caller) } + end + RUBY end end end |