Methods
Instance Public methods
assign_attributes(new_attributes) Link
Allows you to set all the attributes by passing in a hash of attributes with keys matching the attribute names.
If the passed hash responds to permitted?
method and the return value of this method is false
an ActiveModel::ForbiddenAttributesError
exception is raised.
class Cat
include ActiveModel::AttributeAssignment
attr_accessor :name, :status
end
cat = Cat.new
cat.assign_attributes(name: "Gorby", status: "yawning")
cat.name # => 'Gorby'
cat.status # => 'yawning'
cat.assign_attributes(status: "sleeping")
cat.name # => 'Gorby'
cat.status # => 'sleeping'
Also aliased as: attributes=
# File activemodel/lib/active_model/attribute_assignment.rb, line 28 def assign_attributes(new_attributes) unless new_attributes.respond_to?(:each_pair) raise ArgumentError, "When assigning attributes, you must pass a hash as an argument, #{new_attributes.class} passed." end return if new_attributes.empty? _assign_attributes(sanitize_for_mass_assignment(new_attributes)) end
attribute_writer_missing(name, value) Link
Like ‘BasicObject#method_missing`, `#attribute_writer_missing` is invoked when `#assign_attributes` is passed an unknown attribute name.
By default, ‘#attribute_writer_missing` raises an UnknownAttributeError
.
class Rectangle
include ActiveModel::AttributeAssignment
attr_accessor :length, :width
def attribute_writer_missing(name, value)
Rails.logger.warn "Tried to assign to unknown attribute #{name}"
end
end
rectangle = Rectangle.new
rectangle.assign_attributes(height: 10) # => Logs "Tried to assign to unknown attribute 'height'"