validates_length_of with maximum should allow nil [#2309 status:resolved]

Signed-off-by: José Valim <jose.valim@gmail.com>

activemodel/lib/active_model/validations/length.rb

@@ -80,8 +80,10 @@ def validates_length_of(*attrs)
 
           validates_each(attrs, options) do |record, attr, value|
             value = options[:tokenizer].call(value) if value.kind_of?(String)
-            unless !value.nil? and value.size.method(validity_checks[option])[option_value]
-              record.errors.add(attr, key, :default => custom_message, :count => option_value)
+            unless option == :maximum and value.nil?
+              unless !value.nil? and value.size.send(validity_checks[option], option_value)
+                record.errors.add(attr, key, :default => custom_message, :count => option_value)
+              end
             end
           end
         end

activemodel/test/cases/validations/length_validation_test.rb

@@ -52,6 +52,13 @@ def test_validates_length_of_using_minimum
     assert_equal ["is too short (minimum is 5 characters)"], t.errors["title"]
   end
 
+  def test_validates_length_of_using_maximum_should_allow_nil
+    Topic.validates_length_of :title, :maximum => 10
+    t = Topic.create
+    puts t.errors
+    assert t.valid?
+  end
+
   def test_optionally_validates_length_of_using_minimum
     Topic.validates_length_of :title, :minimum => 5, :allow_nil => true
 
@@ -75,9 +82,6 @@ def test_validates_length_of_using_maximum
 
     t.title = ""
     assert t.valid?
-
-    t.title = nil
-    assert !t.valid?
   end
 
   def test_optionally_validates_length_of_using_maximum