MassAssignable

MassAssignable is a simple gem that adds Rails-like mass-assignment behavior to ordinary Ruby objects. This gem has no external dependencies and works everywhere.

Installation

Add this line to your application's Gemfile:

gem 'mass_assignable'

And then execute:

$ bundle

Or install it yourself as:

$ gem install mass_assignable

Usage

Simply include MassAssignable in your class and specify mass assignable attributes using attr_mass_assignable. Any attributes not specified will not be mass assignable.

require 'mass_assignable' # not needed with Rails

class Person
  include MassAssignable

  attr_accessor :name, :age, :height
  attr_mass_assignable :name, :age
end

Then, mass assignment is as easy as calling attributes=.

person = Person.new
person.attributes = { :name => "Derrick", :age => 24, :height => 77 }

person.name
# => "Derrick"

person.age
# => 24

person.height
# => nil

Notice that #height is nil, because we didn't include it in our call to attr_mass_assignable.

If you want an error to be raised when invalid mass assignment is attempted, simply use attr_mass_assignable!.

class ParanoidPerson
  include MassAssignable

  attr_accessor :name, :age, :height
  attr_mass_assignable! :name, :age
end

person = ParanoidPerson.new
person.attributes = { :height => 77 }
# => Raises a RuntimeError

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request