Enumerize

Enumerated attributes with I18n and ActiveRecord/Mongoid/MongoMapper/Sequel support

Installation

Add this line to your application's Gemfile:

gem 'enumerize'

And then execute:

$ bundle

Or install it yourself as:

$ gem install enumerize

Supported Versions

• Ruby 2.2+
• Rails 4.2+

Usage

Basic:

class User
  extend Enumerize

  enumerize :sex, in: [:male, :female]
end

Note that enumerized values are just identificators so if you want to use multi-word, etc. values you should use I18n feature.

ActiveRecord:

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :sex
      t.string :role

      t.timestamps
    end
  end
end

class User < ActiveRecord::Base
  extend Enumerize

  enumerize :sex, in: [:male, :female], default: lambda { |user| SexIdentifier.sex_for_name(user.name).to_sym }

  enumerize :role, in: [:user, :admin], default: :user
end

⚠️ By default, enumerize adds inclusion validation to the model. You can skip validations by passing skip_validations option. ⚠️

class User < ActiveRecord::Base
  extend Enumerize

  enumerize :sex, in: [:male, :female], skip_validations: lambda { |user| user.new_record? }

  enumerize :role, in: [:user, :admin], skip_validations: true
end

Mongoid:

class User
  include Mongoid::Document
  extend Enumerize

  field :role
  enumerize :role, in: [:user, :admin], default: :user
end

MongoMapper:

class User
  include MongoMapper::Document
  extend Enumerize

  key :role
  enumerize :role, in: [:user, :admin], default: :user
end

I18n:

en:
  enumerize:
    user:
      sex:
        male: "Male"
        female: "Female"

or if you use sex attribute across several models you can use defaults scope:

en:
  enumerize:
    defaults:
      sex:
        male: "Male"
        female: "Female"

You can also pass i18n_scope option to specify scope (or array of scopes) storing the translations.

class Person
  extend Enumerize
  extend ActiveModel::Naming

  enumerize :sex, in: %w[male female], i18n_scope: "sex"
  enumerize :color, in: %w[black white], i18n_scope: ["various.colors", "colors"]
end

# localization file
en:
  sex:
    male: "Male"
    female: "Female"
  various:
    colors:
      black: "Black"
  colors:
    white: "White"

Note that if you want to use I18n feature with plain Ruby object don't forget to extend it with ActiveModel::Naming:

class User
  extend Enumerize
  extend ActiveModel::Naming
end

get attribute value:

@user.sex_text # or @user.sex.text

get all values for enumerized attribute:

User.sex.values # or User.enumerized_attributes[:sex].values

use it with forms (it supports :only and :except options):

<%= form_for @user do |f| %>
  <%= f.select :sex, User.sex.options %>
<% end %>

Boolean methods:

user.sex = :male
user.sex.male? #=> true
user.sex.female? #=> false

Predicate methods:

class User
  extend Enumerize

  enumerize :sex, in: %w(male female), predicates: true
end

user = User.new

user.male?   # => false
user.female? # => false

user.sex = 'male'

user.male?   # => true
user.female? # => false

⚠️ If enumerize is used with Mongoid, it's not recommended to use "writer" as a field value since writer? is defined by Mongoid. See more. ⚠️

Using prefix:

class User
  extend Enumerize

  enumerize :sex, in: %w(male female), predicates: { prefix: true }
end

user = User.new
user.sex = 'female'
user.sex_female? # => true

Use :only and :except options to specify what values create predicate methods for.

To make some attributes shared across different classes it's possible to define them in a separate module and then include it into classes:

module PersonEnumerations
  extend Enumerize

  enumerize :sex, in: %w[male female]
end

class Person
  include PersonEnumerations
end

class User
  include PersonEnumerations
end

It's also possible to store enumerized attribute value using custom values (e.g. integers). You can pass a hash as :in option to achieve this:

class User < ActiveRecord::Base
  extend Enumerize

  enumerize :role, in: {:user => 1, :admin => 2}
end

user = User.new
user.role = :user
user.role #=> 'user'
user.role_value #=> 1

User.role.find_value(:user).value #=> 1
User.role.find_value(:admin).value #=> 2

ActiveRecord scopes:

class User < ActiveRecord::Base
  extend Enumerize
  enumerize :sex, :in => [:male, :female], scope: true
  enumerize :status, :in => { active: 1, blocked: 2 }, scope: :having_status
end

User.with_sex(:female)
# SELECT "users".* FROM "users" WHERE "users"."sex" IN ('female')

User.without_sex(:male)
# SELECT "users".* FROM "users" WHERE "users"."sex" NOT IN ('male')

User.having_status(:blocked).with_sex(:male, :female)
# SELECT "users".* FROM "users" WHERE "users"."status" IN (2) AND "users"."sex" IN ('male', 'female')

Shallow scopes:

Adds named scopes to the class directly

class User < ActiveRecord::Base
  extend Enumerize
  enumerize :sex, :in => [:male, :female], scope: :shallow
  enumerize :status, :in => { active: 1, blocked: 2 }, scope: :shallow
end

User.male
# SELECT "users".* FROM "users" WHERE "users"."sex" = 'male'

User.active
# SELECT "users".* FROM "users" WHERE "users"."status" = 1

⚠️ It is not possible to define a scope when using the :multiple option. ⚠️

Array-like attributes with plain ruby objects:

class User
  extend Enumerize

  enumerize :interests, in: [:music, :sports], multiple: true
end

user = User.new
user.interests << :music
user.interests << :sports

and with ActiveRecord:

class User < ActiveRecord::Base
  extend Enumerize

  serialize :interests, Array
  enumerize :interests, in: [:music, :sports], multiple: true
end

get an array of all text values:

@user.interests.texts # shortcut for @user.interests.map(&:text)

Also, the reader method can be overridden, referencing the enumerized attribute value using super:

def sex
  if current_user.admin?
    "Super#{super}"
  else
    super
  end
end

SimpleForm

If you are using SimpleForm gem you don't need to specify input type (:select by default) and collection:

<%= simple_form_for @user do |f| %>
  <%= f.input :sex %>
<% end %>

and if you want it as radio buttons:

<%= simple_form_for @user do |f| %>
  <%= f.input :sex, :as => :radio_buttons %>
<% end %>

Please note that Enumerize overwrites the I18n keys of SimpleForm collections. The enumerized keys are used instead of the SimpleForm ones for inputs concerning enumerized attributes. If you don't want this just pass :collection option to the input call.

Formtastic

If you are using Formtastic gem you also don't need to specify input type (:select by default) and collection:

<%= semantic_form_for @user do |f| %>
  <%= f.input :sex %>
<% end %>

and if you want it as radio buttons:

<%= semantic_form_for @user do |f| %>
  <%= f.input :sex, :as => :radio %>
<% end %>

RSpec

Also you can use builtin RSpec matcher:

class User
  extend Enumerize

  enumerize :sex, in: [:male, :female]
end

describe User do
  it { should enumerize(:sex) }

  # or with RSpec 3 expect syntax
  it { is_expected.to enumerize(:sex) }
end

Qualifiers

in

Use in to test usage of the :in option.

class User
  extend Enumerize

  enumerize :sex, in: [:male, :female]
end

describe User do
  it { should enumerize(:sex).in(:male, :female) }
end

You can test enumerized attribute value using custom values with the in qualifier.

class User
  extend Enumerize

  enumerize :sex, in: { male: 0, female: 1 }
end

describe User do
  it { should enumerize(:sex).in(male: 0, female: 1) }
end

with_default

Use with_default to test usage of the :default option.

class User
  extend Enumerize

  enumerize :sex, in: [:male, :female], default: :female
end

describe User do
  it { should enumerize(:sex).in(:male, :female).with_default(:female) }
end

with_i18n_scope

Use with_i18n_scope to test usage of the :i18n_scope option.

class User
  extend Enumerize

  enumerize :sex, in: [:male, :female], i18n_scope: 'sex'
end

describe User do
  it { should enumerize(:sex).in(:male, :female).with_i18n_scope('sex') }
end

with_predicates

Use with_predicates to test usage of the :predicates option.

class User
  extend Enumerize

  enumerize :sex, in: [:male, :female], predicates: true
end

describe User do
  it { should enumerize(:sex).in(:male, :female).with_predicates(true) }
end

You can text prefixed predicates with the with_predicates qualifiers.

class User
  extend Enumerize

  enumerize :sex, in: [:male, :female], predicates: { prefix: true }
end

describe User do
  it { should enumerize(:sex).in(:male, :female).with_predicates(prefix: true) }
end

with_scope

Use with_scope to test usage of the :scope option.

class User
  extend Enumerize

  enumerize :sex, in: [:male, :female], scope: true
end

describe User do
  it { should enumerize(:sex).in(:male, :female).with_scope(true) }
end

You can text custom scope with the with_scope qualifiers.

class User
  extend Enumerize

  enumerize :sex, in: [:male, :female], scope: :having_sex
end

describe User do
  it { should enumerize(:sex).in(:male, :female).with_scope(scope: :having_sex) }
end

with_multiple

Use with_multiple to test usage of the :multiple option.

class User
  extend Enumerize

  enumerize :sex, in: [:male, :female], multiple: true
end

describe User do
  it { should enumerize(:sex).in(:male, :female).with_multiple(true) }
end

Minitest with Shoulda

You can use the RSpec matcher with shoulda in your tests by adding two lines in your test_helper.rb inside class ActiveSupport::TestCase definition:

class ActiveSupport::TestCase
  ActiveRecord::Migration.check_pending!

  require 'enumerize/integrations/rspec'
  extend Enumerize::Integrations::RSpec

  ...
end

Other Integrations

Enumerize integrates with the following automatically:

• RailsAdmin

Contributing

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