Permalink

gem install permalink

class ApplicationRecord < ActiveRecord::Base
  primary_abstract_class
  include Permalink.active_record
end

Add the method call permalink to your model. Your model should have a permalink attribute.

class Page < ApplicationRecord
  permalink :title
end

You can specify the permalink field:

class Page < ApplicationRecord
  permalink :title, to: "title_permalink"
end

If you don't want to use permalink, you can call Permalink.call("some text") string method and manage the permalink process by yourself.

Permalinks are not unique by default. permalink overrides to_param as following:

def to_param
  "#{id}-#{permalink}"
end

You can define the to_param format:

class Page < ApplicationRecord
  permalink :title, to_param: %w(id permalink page)
end

The above settings will generate something link 100-some-title-page. By overriding to_param method you don't have to change a thing on your app routes.

If you want to generate unique permalink, use the :unique option:

class Page < ApplicationRecord
  permalink :title, unique: true, to_param: "permalink"
end

The permalink can be tied to a given scope. Let's say you want to have unique permalinks by user. Just set the :scope option.

class Page < ApplicationRecord
  belongs_to :user
  permalink :title, unique: true, scope: "user_id"
end

user = User.first
another_user = User.last

page = user.pages.create(title: 'Hello')
page.permalink #=> hello

another_page = another_user.pages.create(title: 'Hello')
another_page.permalink #=> hello

The permalink is generated using ActiveSupport::Multibyte::Chars class; this means that characters will properly replaced from áéíó to aeio, for instance.

The permalink is created when before_validation callback is evaluated. This plugin also tries to generate a permalink when before_save callback is evaluated and the instance has no permalink set.

You can force the permalink generation by setting the :force option.

class Page < ApplicationRecord
  permalink :title, force: true
end

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