I solved the problem. Yeah I am stupid
Here is the code snippet which solved the problem I had.
@user.roles.delete(@old_role)
@user.roles<<@new_role
Nam Kim wrote:
> I am new to Ruby on Rails. Actually I just started two days ago... I am
> working o existing code and having a problem. we have two database
> tables called 'users' and 'roles' they are many-to-many relationship and
> linked through mapping table called roles_users. I want to update user's
> role, but I have no idea how to do, primarily because roles are not
> inherent members of users. The following is the my code snippet, please
> help me out. Please also let me know if you need clarification. Thanks.
>
> Nam
>
> * Currently, I am assuming that users have two roles, but they can have
> multiple roles. So don't be confused.
>
> -------------------In
> _form.rhtml------------------------------------------
> <td align="right">Roles:</td>
> <td><%= updating ? collection_select(:role, :id, @roles, "id",
> "name"):
> (@user.visible_roles.collect { |role| role.name }.sort.join(", "))%>
> </td></tr>
>
>
> -------------------In update action in
> ‘user_controller.rb’----------------
> @user = User.find(params[:id])
> @new_role = Role.find(params[:role][:id])
> @old_role = @user.visible_roles.collect { |role| role.name
> }.sort.join(", ")
> @old_role = Role.find_by_name(@old_role)
> @user.roles.each_index{|index|
> if (@user.roles[index].id == @old_role.id)
> @user.roles[index] = @new_role
> end
> }
> prior_approval = @user.approved
> #...@user.update_attributes({:roles=>@user.roles})
> @user.update_attributes(params[:user])
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