set(key, value) Instance Public methods Set messages for key to

attribute_method_prefix(*prefixes) Instance Public methods Declares a method

validates_confirmation_of(*attr_names) Instance Public methods Encapsulates

new(params={}) Class Public methods Initializes a new model with the given params

define_attribute_methods(*attr_names) Instance Public methods Declares the attributes

validates_inclusion_of(*attr_names) Instance Public methods Validates whether

changed_attributes() Instance Public methods Returns a hash of the attributes

validates_presence_of(*attr_names) Instance Public methods Validates that the

param_key(record_or_class) Class Public methods Returns string to use for params

previous_changes() Instance Public methods Returns a hash of attributes that