Module: ActiveRecord::ReadonlyAttributes::ClassMethods
Relationships & Source Files | |
Defined in: | activerecord/lib/active_record/readonly_attributes.rb |
Instance Method Summary
-
#attr_readonly(*attributes)
::ActiveRecord::Attributes
listed as readonly will be used to create a new record. -
#readonly_attributes
Returns an array of all the attributes that have been specified as readonly.
Instance Method Details
#attr_readonly(*attributes)
::ActiveRecord::Attributes
listed as readonly will be used to create a new record. Assigning a new value to a readonly attribute on a persisted record raises an error.
By setting config.active_record.raise_on_assign_to_attr_readonly
to false
, it will not raise. The value will change in memory, but will not be persisted on save
.
Examples
class Post < ActiveRecord::Base
attr_readonly :title
end
post = Post.create!(title: "Introducing Ruby on Rails!")
post.title = "a different title" # raises ActiveRecord::ReadonlyAttributeError
post.update(title: "a different title") # raises ActiveRecord::ReadonlyAttributeError
# File 'activerecord/lib/active_record/readonly_attributes.rb', line 30
def attr_readonly(*attributes) self._attr_readonly |= attributes.map(&:to_s) if ActiveRecord.raise_on_assign_to_attr_readonly include(HasReadonlyAttributes) end end
#readonly_attributes
Returns an array of all the attributes that have been specified as readonly.
# File 'activerecord/lib/active_record/readonly_attributes.rb', line 39
def readonly_attributes _attr_readonly end