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defining a named_scope which overwrites an existing method is now all…

…owed we just log a warning.

This was motivated by the fact that :open is defined on all classes
as such the named_scope "open" can never be used, without hacking
ActiveRecord with an "undef_method" [#4083 state:resolved]

Signed-off-by: wycats <>
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1 parent 77a2a3d commit b0967cc5cf5ce08e7fb0574692e3bb785e79973a @matthewrudy matthewrudy committed with wycats Mar 2, 2010
Showing with 17 additions and 3 deletions.
  1. +2 −1 activerecord/lib/active_record/named_scope.rb
  2. +15 −2 activerecord/test/cases/named_scope_test.rb
@@ -102,7 +102,8 @@ def scope(name, options = {}, &block)
name = name.to_sym
if !scopes[name] && respond_to?(name, true)
- raise ArgumentError, "Cannot define scope :#{name} because #{}.#{name} method already exists."
+ logger.warn "Creating scope :#{name}. " \
+ "Overwriting existing method #{}.#{name}."
scopes[name] = lambda do |parent_scope, *args|
@@ -371,8 +371,21 @@ def test_table_names_for_chaining_scopes_with_and_without_table_name_included
def test_named_scopes_with_reserved_names
- [:where, :with_scope].each do |protected_method|
- assert_raises(ArgumentError) { Topic.scope protected_method }
+ class << Topic
+ def public_method; end
+ public :public_method
+ def protected_method; end
+ protected :protected_method
+ def private_method; end
+ private :private_method
+ end
+ [:public_method, :protected_method, :private_method].each do |reserved_method|
+ assert Topic.respond_to?(reserved_method, true)
+ ActiveRecord::Base.logger.expects(:warn)
+ Topic.scope(reserved_method)

2 comments on commit b0967cc


Thanks for committing this @wycats.
I spent a lot of energy arguing about this,
but then gave up.

I think it's the correct behaviour to have a warning.

Take care.


+1 lets change it from warn to debug/trace, it is a correctm excpected behavoir. Just spend alf hour with my colleague because of this warning: we thought that we have to rewrite our code to get rid ov scope overriding ;)

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