coerce blank strings to nil values for boolean and integer fields

Signed-off-by: Michael Koziarski <michael@koziarski.com>

activerecord/lib/active_record/base.rb

@@ -2572,11 +2572,14 @@ module ActiveRecord #:nodoc:
       end
 
       def convert_number_column_value(value)
-        case value
-          when FalseClass; 0
-          when TrueClass;  1
-          when '';         nil
-          else value
+        if value == false
+          0
+        elsif value == true
+          1
+        elsif value.is_a?(String) && value.blank?
+          nil
+        else
+          value
         end
       end
 

activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb

@@ -138,7 +138,11 @@ module ActiveRecord
 
         # convert something to a boolean
         def value_to_boolean(value)
-          TRUE_VALUES.include?(value)
+          if value.blank?
+            nil
+          else
+            TRUE_VALUES.include?(value)
+          end
         end
 
         # convert something to a BigDecimal

activerecord/test/cases/validations_test.rb

@@ -1420,8 +1420,8 @@ class ValidatesNumericalityTest < ActiveRecord::TestCase
   def test_validates_numericality_of_with_nil_allowed
     Topic.validates_numericality_of :approved, :allow_nil => true
 
-    invalid!(BLANK + JUNK)
-    valid!(NIL + FLOATS + INTEGERS + BIGDECIMAL + INFINITY)
+    invalid!(JUNK)
+    valid!(NIL + BLANK + FLOATS + INTEGERS + BIGDECIMAL + INFINITY)
   end
 
   def test_validates_numericality_of_with_integer_only
@@ -1434,8 +1434,8 @@ class ValidatesNumericalityTest < ActiveRecord::TestCase
   def test_validates_numericality_of_with_integer_only_and_nil_allowed
     Topic.validates_numericality_of :approved, :only_integer => true, :allow_nil => true
 
-    invalid!(BLANK + JUNK + FLOATS + BIGDECIMAL + INFINITY)
-    valid!(NIL + INTEGERS)
+    invalid!(JUNK + FLOATS + BIGDECIMAL + INFINITY)
+    valid!(NIL + BLANK + INTEGERS)
   end
 
   def test_validates_numericality_with_greater_than