module ActiveModel::Model
Active Model Basic Model¶ ↑
Includes the required interface for an object to interact with Action Pack and Action View, using different Active Model modules. It includes model name introspections, conversions, translations and validations. Besides that, it allows you to initialize the object with a hash of attributes, pretty much like Active Record does.
A minimal implementation could be:
class Person include ActiveModel::Model attr_accessor :name, :age end person = Person.new(name: 'bob', age: '18') person.name # => "bob" person.age # => "18"
Note that, by default, ActiveModel::Model
implements
persisted?
to return false
, which is the most
common case. You may want to override it in your class to simulate a
different scenario:
class Person include ActiveModel::Model attr_accessor :id, :name def persisted? self.id == 1 end end person = Person.new(id: 1, name: 'bob') person.persisted? # => true
Also, if for some reason you need to run code on initialize
,
make sure you call super
if you want the attributes hash
initialization to happen.
class Person include ActiveModel::Model attr_accessor :id, :name, :omg def initialize(attributes={}) super @omg ||= true end end person = Person.new(id: 1, name: 'bob') person.omg # => true
For more detailed information on other functionalities available, please
refer to the specific modules included in ActiveModel::Model
(see below).
Public Class Methods
Initializes a new model with the given params
.
class Person include ActiveModel::Model attr_accessor :name, :age end person = Person.new(name: 'bob', age: '18') person.name # => "bob" person.age # => "18"
# File lib/active_model/model.rb, line 78 def initialize(attributes = {}) assign_attributes(attributes) if attributes super() end
Public Instance Methods
Indicates if the model is persisted. Default is false
.
class Person include ActiveModel::Model attr_accessor :id, :name end person = Person.new(id: 1, name: 'bob') person.persisted? # => false
# File lib/active_model/model.rb, line 93 def persisted? false end