instance method
define_attribute_method
Ruby on Rails 4.2.9
Since v3.1.12Signature
define_attribute_method(attr_name)Declares an attribute that should be prefixed and suffixed by ActiveModel::AttributeMethods.
To use, pass an attribute name (as string or symbol), be sure to declare define_attribute_method after you define any prefix, suffix or affix method, or they will not hook in.
class Person
include ActiveModel::AttributeMethods
attr_accessor :name
attribute_method_suffix '_short?'
# Call to define_attribute_method must appear after the
# attribute_method_prefix, attribute_method_suffix or
# attribute_method_affix declares.
define_attribute_method :name
private
def attribute_short?(attr)
send(attr).length < 5
end
end
person = Person.new
person.name = 'Bob'
person.name # => "Bob"
person.name_short? # => true
Parameters
-
attr_namereq
Source
# File activemodel/lib/active_model/attribute_methods.rb, line 284
def define_attribute_method(attr_name)
attribute_method_matchers.each do |matcher|
method_name = matcher.method_name(attr_name)
unless instance_method_already_implemented?(method_name)
generate_method = "define_method_#{matcher.method_missing_target}"
if respond_to?(generate_method, true)
send(generate_method, attr_name)
else
define_proxy_call true, generated_attribute_methods, method_name, matcher.method_missing_target, attr_name.to_s
end
end
end
attribute_method_matchers_cache.clear
end
Defined in activemodel/lib/active_model/attribute_methods.rb line 284
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Defined in ActiveModel::AttributeMethods::ClassMethods