thoughtbot--factory_bot/lib/factory_girl/attribute.rb

class Factory

  # Raised when defining an invalid attribute:
  # * Defining an attribute which has a name ending in "="
  # * Defining an attribute with both a static and lazy value
  # * Defining an attribute twice in the same factory
  class AttributeDefinitionError < RuntimeError
  end
  
  class Attribute #:nodoc:

    attr_reader :name

    def initialize(name)
      @name = name.to_sym

      if @name.to_s =~ /=$/
        attribute_name = $`
        raise AttributeDefinitionError, 
          "factory_girl uses 'f.#{attribute_name} value' syntax " +
          "rather than 'f.#{attribute_name} = value'"
      end
    end

    def add_to(proxy)
    end
  end

end