Colin, I figured out most of it. But stayed stuck on a detail.
My app now has Account, User, and Role models. The Role model links the Account and User models. User has_many roles, and has_many accounts through roles. User accepts_nested_properties for accounts.
Everything works except for setting an extra attribute on the Role model. The Role model has a role_type column that I want to set when the records are created. It keeps showing up blank though.
Basically, when the User and the Account objects are created, I want the Role model that joins them to have “owner” in the role_type column. But it’s showing up blank. I feel like I am mixing up “ownership” with “roles”, yet it seems natural to store the in the same table. I thought I could use inheritance to simplify it, but it’s causing more headaches. I can’t change the type column arbitrarily if I wanted to change the role of a use for example.
My questions are: How do I set the role_type column? And is it stupid? It doesn’t seem like a good way to set up something meant to be secure in such a way.
Should I use inheritance instead and create separate associations for each role type?
class User < ActiveRecord::Base
attr_accessible :name, :email, :password, :password_confirmation, :accounts, :accounts_attributes
has_many :accounts, through: :roles
class Account < ActiveRecord::Base
has_many :users, through: “roles”
class Role < ActiveRecord::Base
attr_accessible :account_id, :user_id, :role_type
@user = User.new
@role = @user.roles.build(role_type: “owner”)
@account = @user.accounts.build
@user = User.new(params[:user])
<%= simple_form_for @user do |f| %>
<%= f.simple_fields_for :accounts do |account_form| %>
<%= account_form.input :title %>
<% end %>
<%= f.input :name %>
<%= f.submit ‘Sign up’, class: ‘btn btn-primary’ %>
<% end %>