Most of the time, these methods are called from actual methods defined
from columns in the schema, not from method_missing, so the current
wording is misleading.
Ruby uses the original method name, so will show the __temp__ method
name in the backtrace. However, in the common case the method name
is compatible with the `def` keyword, so we can avoid the __temp__
method name in that case to improve the name shown in backtraces
or TracePoint#method_id.
Since Rails 6.0 will support Ruby 2.4.1 or higher
`# frozen_string_literal: true` magic comment is enough to make string object frozen.
This magic comment is enabled by `Style/FrozenStringLiteralComment` cop.
* Exclude these files not to auto correct false positive `Regexp#freeze`
- 'actionpack/lib/action_dispatch/journey/router/utils.rb'
- 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb'
It has been fixed by https://github.com/rubocop-hq/rubocop/pull/6333
Once the newer version of RuboCop released and available at Code Climate these exclude entries should be removed.
* Replace `String#freeze` with `String#-@` manually if explicit frozen string objects are required
- 'actionpack/test/controller/test_case_test.rb'
- 'activemodel/test/cases/type/string_test.rb'
- 'activesupport/lib/active_support/core_ext/string/strip.rb'
- 'activesupport/test/core_ext/string_ext_test.rb'
- 'railties/test/generators/actions_test.rb'
When requesting columns names from database adapters AR:Result
would dup/freeze column names, this prefers using fstrings which
cuts down on repeat allocations
Attributes that are retained keep these fstrings around for the long
term
Note, this has the highest impact on "short" result sets, eg: Topic.first where you can void allocating the number of columns * String.
This starts to fix#31832.
ActiveModel::Attributes includes ActiveModel::AttributeMethods,
which requires an `#attributes` method that returns a hash with string keys.
`define_attribute_methods` splats the arguments,
then calls out to `define_attribute_method` for
each. When defining a singule attribute, using
the singular version of the method saves us an
array and an extra method call.
This is the first PR of a WIP to bring the attributes API to
ActiveModel. It is not yet ready for public API.
The `attributes_dirty_test.rb` file was created based on `dirty_test.rb`,
and the simplifications in the diff do much to motivate this change.
```
diff activemodel/test/cases/dirty_test.rb activemodel/test/cases/attributes_dirty_test.rb
3a4
> require "active_model/attributes"
5c6
< class DirtyTest < ActiveModel::TestCase
---
> class AttributesDirtyTest < ActiveModel::TestCase
7,41c8,12
< include ActiveModel::Dirty
< define_attribute_methods :name, :color, :size
<
< def initialize
< @name = nil
< @color = nil
< @size = nil
< end
<
< def name
< @name
< end
<
< def name=(val)
< name_will_change!
< @name = val
< end
<
< def color
< @color
< end
<
< def color=(val)
< color_will_change! unless val == @color
< @color = val
< end
<
< def size
< @size
< end
<
< def size=(val)
< attribute_will_change!(:size) unless val == @size
< @size = val
< end
---
> include ActiveModel::Model
> include ActiveModel::Attributes
> attribute :name, :string
> attribute :color, :string
> attribute :size, :integer
```
