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Added Module#alias_attribute [Jamis/DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4653 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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1 parent b5c2366 commit 9d00b0ce858a6f642089a477e7d39fb3f9cf6777 @dhh dhh committed Aug 3, 2006
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@@ -1,5 +1,22 @@
*SVN*
+* Added Module#alias_attribute [Jamis/DHH]. Example:
+
+ class Content < ActiveRecord::Base
+ # has a title attribute
+ end
+
+ class Email < ActiveRecord::Base
+ alias_attribute :subject, :title
+ end
+
+ e = Email.find(1)
+ e.title # => "Superstars"
+ e.subject # => "Superstars"
+ e.subject? # => true
+ e.subject = "Megastars"
+ e.title # => "Megastars"
+
* Deprecation: easier to work with warning behavior as procs; default behaviors for each environment so users needn't update env.rb; and testing pleasure with assert_deprecated, assert_not_deprecated. [Jeremy Kemper]
By default, test prints to $stderr, dev logs, production ignores.
Provide your own per-environment in e.g. config/environments/development.rb:
@@ -25,9 +25,11 @@ def to_date
def to_time(form = :local)
::Time.send(form, year, month, day)
end
-
- alias :xmlschema :to_s
+
+ def xmlschema
+ to_time.xmlschema
+ end
end
end
end
-end
+end
@@ -27,4 +27,31 @@ def alias_method_chain(target, feature)
alias_method "#{aliased_target}_without_#{feature}#{punctuation}", target
alias_method target, "#{aliased_target}_with_#{feature}#{punctuation}"
end
+
+ # Allows you to make aliases for attributes, which includes
+ # getter, setter, and query methods.
+ #
+ # Example:
+ #
+ # class Content < ActiveRecord::Base
+ # # has a title attribute
+ # end
+ #
+ # class Email < ActiveRecord::Base
+ # alias_attribute :subject, :title
+ # end
+ #
+ # e = Email.find(1)
+ # e.title # => "Superstars"
+ # e.subject # => "Superstars"
+ # e.subject? # => true
+ # e.subject = "Megastars"
+ # e.title # => "Megastars"
+ def alias_attribute(new_name, old_name)
+ module_eval <<-STR, __FILE__, __LINE__+1
+ def #{new_name}; #{old_name}; end
+ def #{new_name}?; #{old_name}?; end
+ def #{new_name}=(v); self.#{old_name} = v; end
+ STR
+ end
end
@@ -0,0 +1,31 @@
+require File.dirname(__FILE__) + '/../../abstract_unit'
+
+module AttributeAliasing
+ class Content
+ attr_accessor :title
+
+ def title?
+ !title.nil?
+ end
+ end
+
+ class Email < Content
+ alias_attribute :subject, :title
+ end
+end
+
+class AttributeAliasingTest < Test::Unit::TestCase
+ def test_attribute_alias
+ e = AttributeAliasing::Email.new
+
+ assert !e.subject?
+
+ e.title = "Upgrade computer"
+ assert_equal "Upgrade computer", e.subject
+ assert e.subject?
+
+ e.subject = "We got a long way to go"
+ assert_equal "We got a long way to go", e.title
+ assert e.title?
+ end
+end
@@ -117,7 +117,6 @@ def quux_with_baz?
end
class MethodAliasingTest < Test::Unit::TestCase
-
def setup
Object.const_set(:FooClassWithBarMethod, Class.new)
FooClassWithBarMethod.send(:define_method, 'bar', Proc.new { 'bar' })

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