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Has One

The HasOne association shows the unfolded view of your has_one association. It's like peaking on the Show view of that associated record. The user can also access the Attach and Detach buttons.

ruby
field :admin, as: :has_one
Has one

Options

searchable

Turns the attach field/modal from a select input to a searchable experience

ruby
class CourseLink < Avo::BaseResource
  field :links,
    as: :has_many,
    searchable: true
end

WARNING

Avo uses the search feature behind the scenes, so make sure the target resource has the search_query option configured.

ruby
# app/avo/resources/course_link_resource.rb
class CourseLinkResource < Avo::BaseResource
  self.search_query = -> do
    scope.ransack(id_eq: params[:q], link_cont: params[:q], m: "or").result(distinct: false)
  end
end

Default

false

Possible values

true, false

attach_scope

Scope out the records the user sees on the Attach modal.

Default

nil

Possible values

ruby
field :user,
  as: :belongs_to,
  attach_scope: -> { query.non_admins }

Pass in a block where you attach scopes to the query object. The block is executed in the AssociationScopeHost, so follow the docs to see what variables you have access to.

option

Default

false

Possible values

true, false

Show on edit screens

By default, has_and_belongs_to_many is only visible on the Show page. If you want to enable it on the Edit page, too, you need to add the show_on: :edit option.

WARNING

Adding associations on the New screen is not currently supported. The association needs some information from the parent record that hasn't been created yet (because the user is on the New screen).

You may use the redirect helpers to have the following flow:

  1. User is on the New view. They can't see the association panels yet.
  2. User creates the record.
  3. They get redirected to the Show/Edit view, where they can see the association panels.
  4. User attaches associations.