How do you update HABTM relationships or create.

rubyonrails-talk
1

Hi,

I have a User model with a HABTM relation to a Role model and vice versa. So There's a roles_users table that references :user and :role.

I'm using formtastic, and in the user.edit.html.erb I have a line that outputs the roles as a multi-select list box. But the box is not showing the roles that have been assigned to the users.

Another problem is that if I select a few roles and press the update button, the roles are not being asssigned. I have to manually assign roles by accessing the database.

Isn't this stuff supposed to happen automatically when you call @user.update_attributes(params[:user]) in the user_controller ?

Thanks in advance.

2

Hi

How do u create form here?

Sijo

3

Hi, just like the following:

<% semantic_form_for @user do |f| %>

<% f.inputs do %>

<%= f.input :email %>

<%= f.input :first_name %>

<%= f.input :last_name %>

<%= f.input :roles %>

<% end %>

<%= f.buttons %>

<% end %>

4

Ok I found the problem, I had an attr_accessor :role_ids in my User model which was throwing things off. Everything worked after I removed it.

5

I am very new to Rails and I am more or less only 6 months to 1 year kid in Rails...

I just wondering with your code.. I really dont see what is "semantic_form_for " and f.buttons?? Is it view helper that you have written or any plugin which overrides the default form_for construct?? This would be very helpful to me in writing the more maintainable Rails code...

6

He said he was using Formtastic. That's probably where those methods come from. But don't take my word for it. Google is your friend in this case.

Best,

7

Formtastic indeed.