```ruby
Dir.glob(File.join(File.dirname(__FILE__),
         'validates_constancy',
         '*.rb') do |filename|
  require filename
end

ActiveRecord::Base.class_eval { include ConstancyValidation }
```

Add missing parenthesis in Dir.glob statement
user
```ruby
Dir.glob(File.join(File.dirname(__FILE__),
         'validates_constancy',
         '*.rb')) do |filename|
  require filename
end

ActiveRecord::Base.class_eval { include ConstancyValidation }
```
assistant