activeadmin: adding delete for a nested resource

Question

I have a infrastructure object composed for many datacenters. In the apps/admin/infrastructures.rb I have the following code:

form do |f|   f.inputs "Infrastructure details" do     f.input :name      f.has_many :datacenters do |datacenter_form|       datacenter_form.input :name             end   end   f.buttons end 

I can add datacenters with no problems but I don't know how I can delete it from infrastructure form.

Answer 1

Sep 2017 Update:

Rails 5.1.4, ActiveAdmin 1.0.0

Append :id and _destroy in permit_params along with other attributes from the model e.g. :name in your case. Then provide the :allow_destroy option in f.has_many too. Other requirements remain the same; like adding allow_destroy: true in accepts_nested_attributes_for.

Final look:

ActiveAdmin.register Infrastructure do   permit_params :name, datacenters_attributes: [:id, :_destroy, :name]    form do |f|     f.inputs "Infrastructure details" do       f.input :name        f.has_many :datacenters, heading: false,                                allow_destroy: true,                                new_record: false do |datacenter_form|         datacenter_form.input :name               end     end     f.buttons   end end 

ActiveAdmin Reference

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This worked for me:

     i.input :_destroy, as: :boolean 

and in the Model remember to add :allow_destroy :

     accepts_nested_attributes_for :images, allow_destroy: true 

Answer 2

Solved adding the following line:

datacenter_form.input :_destroy, :as => :boolean, :required => false, :label => 'Remove' 

The code looks like:

form do |f|   f.inputs "Infrastructure details" do     f.input :name      f.has_many :datacenters do |datacenter_form|       datacenter_form.input :name       datacenter_form.input :_destroy, :as => :boolean, :required => false, :label => 'Remove'     end   end   f.buttons end