select2_selected_list.md

Select2

Selected List

This form control allows you to handle your many to many associations.

If, for example, you have something like this:

class Event < ActiveRecord::Base
  has_and_belongs_to_many :performers
end

class Performer < ActiveRecord::Base
  has_and_belongs_to_many :events
end

In the ActiveAdmin's Event form, you can add:

f.input :performer_ids, as: :selected_list

To get...

Remember: the input name must be: performer_ids not performers and you need to add to permit_params the performer_ids: [] key.

Options

• url: (optional) This is the URL where to get the results. This URL expects an activeadmin collection Url (like the index action) or anything that uses ransack search gem. By default, the url will be inferred from the attribute. In the example: GET /admin/performers.
• response_root: (optional) If a request to url responds with root, you can indicate the name of that root with this attribute. By default, the gem will try to infer the root from url. For example: if url is GET /admin/performers, the root will be performers. If you have a rootless api, you don't need to worry about this attribute.
• minimum_input_length: (optional) Minimum number of characters required to initiate the search. It defaults to: 1
• fields: (optional) An array of field names where to search for matches in the related model. If we give many fields, they will be searched with an OR condition.
• display_name: (optional) You can pass an optional display_name to set the attribute to show results on the select. It defaults to: name.
• width: (optional) You can set the select input width (px or %).
• order_by: (optional) Order (sort) results by a specific attribute, suffixed with _desc or _asc. Eg: description_desc. By default is used the first field in descending direction.
• predicate: (optional) You can change the default ransack predicate. It defaults to contains