Not work has_many :through association

Rails
1

Not work has_many :through association in rails 2.3.5

Models:

class Role < ActiveRecord::Base
attr_accessible :name

has_many :assignments
has_many :users, :through => :assignments
end

class User < ActiveRecord::Base
attr_accessible :name

has_many :assignments
has_many :roles, :through => :assignments
end

class Assignment < ActiveRecord::Base
belongs_to :user
belongs_to :role
end

In the view form of user

- for user in User.all
  = check_box_tag 'role[user_ids][]', user.id, @role.users.include?

(user)
=h user.name

When I create a new user, nothing happens, the array of user_ids is
empty

2

I have a typical method in controller:

def create
@user = User.new(params[:user])
if @user.save
flash[:notice] = “Successfully created user.”
redirect_to @user
else
render :action => ‘new’
end
end

I thought it automatically saves the attribute :role_ids

I need to explicitly save it?

On 25 mayo, 10:23, Frederick C. [email protected]

3

On May 24, 11:08 pm, Alexander [email protected] wrote:

In the view form of user

- for user in User.all
  = check_box_tag 'role[user_ids][]', user.id, @role.users.include?

(user)
=h user.name

When I create a new user, nothing happens, the array of user_ids is
empty

Those checkboxes will result in params[‘role[user_ids]’] being set to
an array of user ids - What does your controller code look like? If
it’s just a classic User.create params[:user] that clearly isn’t being
used at all

Fred

4

On May 25, 12:35 pm, Alexander [email protected] wrote:

end

I thought it automatically saves the attribute :role_ids

But that’s not what your form (at least not in your initial post) is
doing - it’s setting the attribute :user_ids in params[:role] which
you aren’t using. Did you actually mean to create a checkbox
user[role_ids][] for each role ?

Fred

5

On May 25, 2:45 pm, Alexander [email protected] wrote:

you are right, my mistake
in the user form i have this

- for role in Role.all
  = check_box_tag "user[role_ids][]", role.id, @user.roles.include?

(role)
=h role.name

If you look at your development log file does it actually look like
those parameters are being submitted as you expected ?

Fred

6

you are right, my mistake
in the user form i have this

- for role in Role.all
  = check_box_tag "user[role_ids][]", role.id, @user.roles.include?

(role)
=h role.name

On 25 mayo, 13:56, Frederick C. [email protected]

7

i found the solution, it was so simple as add this to model of user
attr_accessible :role_ids

anyway thanks for all your answers