ActiveAdmin ForbiddenAttributesError

Question

i am a brand new for Ruby on Rails. I am using a ActiveAdmin and i have a problem with creating a AdminUser ActiveModel::ForbiddenAttributesError in Admin::AdminUsersController#create ActiveModel::ForbiddenAttributesError Request Parameters: {"utf8"=>"✓", "authenticity_token"=>"nvV++6GNTdA/nDzw1iJ6Ii84pZPcv2mzg0PK2Cg9Ag0=", "admin_user"=>{"email"=>"admin2@example.com"}, "commit"=>"Create Admin user"}* Rails 4.1.0 activeadmin 1.0.0 ruby 2.1 app/admin/admin_user.rb ``` ActiveAdmin.register AdminUser do index do column :email column :current_sign_in_at column :last_sign_in_at column :sign_in_count default_actions end form do |f| f.inputs "Admin Details" do f.input :email end f.actions end end ``` app/models/admin_user.rb ``` class AdminUser < ActiveRecord::Base # Include default devise modules. Others available are: # :confirmable, :lockable, :timeoutable and :omniauthable devise :database_authenticatable, :recoverable, :rememberable, :trackable, :validatable after_create { |admin| admin…

Accepted Answer

`Rails 4` uses strong parameters, which moves attribute whitelisting from the model to the controller. It is necessary to specify the attributes that you would like to be saved in the database. You have not permitted the attributes in your code, which is why you are receiving the `ActiveModel::ForbiddenAttributesError`.

Refer to the documentation of ActiveAdmin : Setting up Strong Parameters

You can setup strong parameters in the following way, using `permit_params` method which creates a method called `permitted_params`, use this method when overriding `create` or `update` actions:

```
ActiveAdmin.register AdminUser do
  ## ... 
  permit_params :attr1, :attr2 ## Add this line
end
```

Replace `:attr1`, `:attr2`, etc with the actual attribute names that you want to whitelist. For example: `:email`

ActiveAdmin ForbiddenAttributesError

Solution

Problem