Strong params on nested attributes in rails

Question

I'm having a problem when specifying a nested param in the strong param whitelist

whitelisting with permit! works

def sign_up_params
  params.require(:user).permit!
end

but specifying the param fails

def sign_up_params
  params.require(:user).permit(:name, ......, role_ids: [])
end

error: unpermitted params role_ids: []

My models:

Roles: 
  has_and_belongs_to_many :users

Users:
  has_and_belongs_to_many :roles

join table: roles_users

I added a console screenshot. It an habtm error (displaying like a link)

Thank you.. finally found an answer create

@user = User.new(sign_up_params)
@user.role_ids = params[:user][:role_ids]

rails version?, also can you add what is in params in the controller? — Gonzalo S, Mar 14 '18 at 01:46
controller params params.require(:user).permit(:username,:email, :password, :password_confirmation, role_ids: []) — , Mar 14 '18 at 02:29

score 0 · Answer 1 · answered Mar 14 '18 at 05:57

0

It seems have problem in your model relation. It need change to below:

users:
has_and_belongs_to_many :roles


roles:
has_and_belongs_to_many :users

answered Mar 14 '18 at 05:57

Viet Nguyen

1 Answers1