Active Model Validates Intersection Of

A custom validation for Active Model that check if an array is included in another one.

Identical to the method validates_inclusion_of from ActiveModel but for array comparison.

Consider an User model that have some set of "default" permissions.

class User < ActiveRecord::Base
  DEFAULT_PERMISSION = ["read", "write", "share"]
  validates_intersection_of :permission, in: DEFAULT_ROLES
end

If you want to validate your user based on an array:

user = User.new(permission: ["read", "share"])
user.valid? #true

 user = User.new(permission: ["read", "admin"])
 user.valid? #false

This active model custom validation is for you!

Installation

Add this line to your application's Gemfile:

gem 'active_model_validates_intersection_of'

And then execute:

$ bundle

Or install it yourself as:

$ gem install active_model_validates_intersection_of

Usage

• in: parameter is required
• message: is optional

class User < ActiveRecord::Base
  DEFAULT_PERMISSION = ["read", "write", "share"]
  validates_intersection_of :permission, in: DEFAULT_ROLES
end

class User < ActiveRecord::Base
  DEFAULT_PERMISSION = ["read", "write", "share"]
  validates_intersection_of :permission, in: DEFAULT_ROLES, message: "invalid permission"
end

You can also use the custom validation directly:

class User < ActiveRecord::Base
  DEFAULT_PERMISSION = ["read", "write", "share"]
  validates_with ActiveModelValidatesIntersectionOf::Validator, attributes: [:permission], in: VALID_ARRAY
end

License

The gem is available as open source under the terms of the MIT License.

Contributing

First of all, thank you for wanting to help!

1. Fork it.
2. Create a feature branch - git checkout -b more_magic
3. Add tests and make your changes
4. Check if tests are ok - rake spec
5. Commit changes - git commit -am "Added more magic"
6. Push to Github - git push origin more_magic
7. Send a pull request! :heart: