Fix thread lock on undefine

Move active model methods into active model ORM module to be included
manually if not using AR or other ORM

lib/validates_timeliness/attribute_methods.rb

@@ -33,17 +33,11 @@ module ValidatesTimeliness
         }.tap { |mod| include mod }
       end
 
-      def undefine_attribute_methods
-        super.tap { undefine_timeliness_attribute_methods }
-      end
-
       def undefine_timeliness_attribute_methods
-        generated_timeliness_methods.synchronize do
         generated_timeliness_methods.module_eval do
           instance_methods.each { |m| undef_method(m) } 
         end
       end
-      end
 
       protected
 

lib/validates_timeliness/orm/active_model.rb

@@ -0,0 +1,20 @@
+module ValidatesTimeliness
+  module ORM
+    module ActiveModel
+      extend ActiveSupport::Concern
+
+      module ClassMethods
+        public
+
+        def define_attribute_methods(*attr_names)
+          super.tap { define_timeliness_methods}
+        end
+
+        def undefine_attribute_methods
+          super.tap { undefine_timeliness_attribute_methods }
+        end
+      end
+      
+    end
+  end
+end

lib/validates_timeliness/orm/active_record.rb

@@ -14,7 +14,7 @@ module ValidatesTimeliness
           timeliness_column_for_attribute(attr_name).type
         end
 
-        if ActiveModel.version >= Gem::Version.new('4.2')
+        if ::ActiveModel.version >= Gem::Version.new('4.2')
           def timeliness_column_for_attribute(attr_name)
             columns_hash.fetch(attr_name.to_s) do |key|
               validation_type = _validators[key.to_sym].find {|v| v.kind == :timeliness }.type.to_s

spec/spec_helper.rb

@@ -7,6 +7,7 @@ require 'action_view'
 require 'timecop'
 
 require 'validates_timeliness'
+require 'validates_timeliness/orm/active_model'
 
 require 'support/test_model'
 require 'support/model_helpers'
@@ -30,14 +31,9 @@ I18n.available_locales = ['en', 'es']
 module TestModelShim
   extend ActiveSupport::Concern
   include ValidatesTimeliness::AttributeMethods
+  include ValidatesTimeliness::ORM::ActiveModel
 
   module ClassMethods
-    # Hook method for attribute method generation
-    def define_attribute_methods(attr_names)
-      super
-      define_timeliness_methods
-    end
-
     # Hook into native time zone handling check, if any
     def timeliness_attribute_timezone_aware?(attr_name)
       false

spec/validates_timeliness/orm/active_record_spec.rb

@@ -239,4 +239,10 @@ RSpec.describe ValidatesTimeliness, 'ActiveRecord' do
       expect(Employee.define_attribute_methods).to be_falsey
     end
   end
+
+  context "undefine_attribute_methods" do
+    it "returns a falsy value if the attribute methods have already been generated" do
+      expect { Employee.undefine_attribute_methods }.to_not raise_error
+    end
+  end
 end