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.

Community · Accepted Answer · 2020-06-20 09:12:55Z

50

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

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

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Jun 25, 2012 at 21:37

tomek

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3 Comments

februaryInk Over a year ago

With Rails 4, it only worked for me once I permitted :_destroy through my strong parameters: permit_params ..., nested_model_attributes: [:_destroy, ... ]

Rob Over a year ago

I'd forgotten the allow_destroy: true option on accepts_nested_attributes_for

caesarsol Over a year ago

I thought permit_params was enough, thank you! none of the other answers mention this.

arogachev · Accepted Answer · 2015-10-06 03:55:59Z

14

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

edited Oct 6, 2015 at 3:55

arogachev

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answered Jan 30, 2012 at 18:40

Seoman

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4 Comments

pizza247 Over a year ago

this works, but it just seems sloppy. Is there a way to add the Delete button that active admin has when you add a new nested resource to existing resources on an update?

Joe Sak Over a year ago

Agreed. Why doesn't the delete button appear for persisted records?

DhatchXIX Over a year ago

Agreed is there anyway to get a button?

Alfie Over a year ago

Yes, has anyone found a solution to this?

user3161259 · Accepted Answer · 2014-01-04 21:02:35Z

5

If you cant destroy the object nested. You need to put :_destroy in your app/admin/object.rb permit_params

permit_params :id,:name, :cod, :_destroy

answered Jan 4, 2014 at 21:02

user3161259

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1 Comment

x6iae Over a year ago

In case of nested attributes needed to be destroyed, the :_destroy param should be in the nested_attributes attributes. => ( permit_params :attr, :attr, <nestedattr>_attributes: [:attr, :attr, :_destroy]

Iwo Dziechciarow · Accepted Answer · 2012-12-14 16:48:02Z

I hope this will be helpful (I've changed my code to suit your example, so I hope there are no typos here):

  form do |f|
    f.inputs "Infrastructure details" do
      f.input :name

      f.has_many :datacenters do |datacenter_form|
        datacenter_form.inputs :datacenters do
          datacenter_form.input :name
        end
        datacenter_form.buttons do
          link_to "Delete", admin_datacenter_path(datacenter_form.object), method: "delete", class: "button" unless datacenter_form.object.new_record?
        end
      end
    end
    f.buttons
  end

and the controller method should be defined in datacenters.rb

controller do
    def destroy
      @datacenter = Datacenter.find(params[:id])
      @datacenter.destroy
      redirect_to edit_admin_retailer_path(@datacenter.infrastructure)
    end
  end

smudge · Accepted Answer · 2012-01-24 01:00:22Z

0

This should work:

datacenter_form.label :_delete
datacenter_form.check_box :_delete

This adds a checkbox for each nested object which will delete the object if checked.

answered Jan 24, 2012 at 1:00

smudge

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1 Comment

Seoman Over a year ago

Thanks for the answer. I'm getting this error: "undefined method `_delete' for #<Datacenter:0x000000051d3170>"

Alexey Krivitsky · Accepted Answer · 2018-01-07 23:33:14Z

0

Don't forget to add the following to your parent model

has_many :child_name, :dependent => :destroy

answered Jan 7, 2018 at 23:33

Alexey Krivitsky

1

1 Comment

sparkitny Over a year ago

Please be more specific with your answer. Provide an explanation of what this does and how the code snippet answers the question.

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