Re: [Rails] Setting an addional attribute on the join model in a has_many through relationship

On 1 May 2012 17:05, Mohamad El-Husseini <husseini.mel@gmail.com> wrote:
> I have User, Account, and Role models. The Account model accepts nested
> properties for users. This way users can create their account and user
> records at the same time.
>
> class AccountsController < ApplicationController
>   def new
>     @account = Account.new
>     @user = @account.users.build
>   end
> end
>
> The above will work, but the user.roles.type defaults to member. At the time
> of registration, I needuser.roles.type to default to admin. This does not
> work:
>
> class AccountsController < ApplicationController
>   def new
>     @account = Account.new
>     @role = @account.role.build
>     # Role.type is protected; assign manually
>     @role.type = "admin"
>     @user = @account.users.build
>   end
> end

It depends what you mean by 'work'. It will assign the type of @role
to "admin" but the problem is that you have not saved it to the
database after changing the type. By the way, I advise against using
type as an attribute name, that is a reserved attribute name for use
with STI.

> ...

> # user_id, account_id, type [admin|moderator|member]
> class Role < ActiveRecord::Base
>   belongs_to :user
>   belongs_to :account
>   after_initialize :init
>
>   ROLES = %w[owner admin moderator member]
>
>   private
>   def init
>     self.role = "member" if self.new_record?
>   end
> end

Should that not be self.type (apart from the fact that type is not a
good name)? But if you want a default value for a column why not just
set the default in the database?

Colin

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