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Class: ActiveModel::Attribute::Null

Do not use. This class is for internal use only.
Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::ActiveModel::Attribute
Instance Chain:
self, ::ActiveModel::Attribute
Inherits: ActiveModel::Attribute
Defined in: activemodel/lib/active_model/attribute.rb

Class Method Summary

::ActiveModel::Attribute - Inherited

.from_database, .from_user,
.new

This method should not be called directly.
.null, .uninitialized, .with_cast_value

Instance Attribute Summary

::ActiveModel::Attribute - Inherited

#came_from_user?, #changed?, #changed_in_place?, #has_been_read?, #initialized?, #name, #type, #value_before_type_cast,
#assigned?

Alias for #original_attribute.
#changed_from_assignment?, #original_attribute

Instance Method Summary

::ActiveModel::Attribute - Inherited

#==, #encode_with,
#eql?

Alias for #==.
#forgetting_assignment, #hash, #init_with, #original_value, #original_value_for_database, #serializable?, #type_cast, #value, #value_for_database, #with_cast_value, #with_type, #with_user_default, #with_value_from_database, #with_value_from_user, #_original_value_for_database, #_value_for_database, #initialize_dup

Constructor Details

.new(name) ⇒ Null

[ GitHub ] 

  


# File 'activemodel/lib/active_model/attribute.rb', line 223



def initialize(name)
  super(name, nil, Type.default_value)
end


  







Instance Method Details



  

    #type_cast  
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/attribute.rb', line 227



def type_cast(*)
  nil
end


  








  

    #with_cast_value(value)  
  



  

    

Alias for #with_value_from_database.


  



  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/attribute.rb', line 239



alias_method :with_cast_value, :with_value_from_database


  








  

    #with_type(type)  
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/attribute.rb', line 231



def with_type(type)
  self.class.with_cast_value(name, nil, type)
end


  








  

    #with_value_from_database(value)  
    Also known as: #with_value_from_user, #with_cast_value
  



  

    
  





  
Raises:





  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/attribute.rb', line 235



def with_value_from_database(value)
  raise ActiveModel::MissingAttributeError, "can't write unknown attribute `#{name}`"
end


  








  

    #with_value_from_user(value)  
  



  

    

Alias for #with_value_from_database.


  



  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/attribute.rb', line 238



alias_method :with_value_from_user, :with_value_from_database