From 2859341c383daac74608f978d8e8fad2229042a3 Mon Sep 17 00:00:00 2001
From: Daniel Fox <romaimperator@gmail.com>
Date: Tue, 23 Dec 2014 00:19:14 -0600
Subject: Fixing numeric attrs when set to same negative value

This bug occurs when an attribute of an ActiveRecord model is an
ActiveRecord::Type::Integer type or a ActiveRecord::Type::Decimal type (or any
other type that includes the ActiveRecord::Type::Numeric module. When the value
of the attribute is negative and is set to the same negative value, it is marked
as changed.

Take the following example of a Person model with the integer attribute age:

    class Person < ActiveRecord::Base
      # age          :integer(4)
    end

The following will produce the error:

    person = Person.new(age: -1)
    person.age = -1
    person.changes
    => { "age" => [-1, -1] }
    person.age_changed?
    => true

The problematic line is here:

    module ActiveRecord
      module Type
        module Numeric
          ...

          def non_numeric_string?(value)
            # 'wibble'.to_i will give zero, we want to make sure
            # that we aren't marking int zero to string zero as
            # changed.
            value.to_s !~ /\A\d+\.?\d*\z/
          end
        end
      end
    end

The regex match doesn't accept numbers with a leading '-'.
---
 activerecord/test/cases/type/integer_test.rb | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'activerecord/test/cases/type/integer_test.rb')

diff --git a/activerecord/test/cases/type/integer_test.rb b/activerecord/test/cases/type/integer_test.rb
index 5942f77e18..af4d0b4642 100644
--- a/activerecord/test/cases/type/integer_test.rb
+++ b/activerecord/test/cases/type/integer_test.rb
@@ -47,6 +47,8 @@ module ActiveRecord
         assert type.changed?(5, 5, '5wibble')
         assert_not type.changed?(5, 5, '5')
         assert_not type.changed?(5, 5, '5.0')
+        assert_not type.changed?(-5, -5, '-5')
+        assert_not type.changed?(-5, -5, '-5.0')
         assert_not type.changed?(nil, nil, nil)
       end
 
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