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POComplex forms - Managing multiple models in a single form - (3rd degree madness)
 

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    <p><strong>I have isolated the problem in the second block of code below</strong> (if you don't want all the details): I can create new users from the account model. I can't assign those users roles from the accounts model. I am using fields_for, this method does not work when I attempt to assign the role_ids to the roles model. My db is set up in the following way:</p> <ol> <li><p>Account model has_many :<strong>users</strong></p></li> <li><p>User model has_and_belongs_to_many :<strong>roles</strong>, belongs_to :<strong>accounts</strong></p></li> <li><p>Roles model has_and_belongs_to_many :<strong>users</strong></p></li> </ol> <p>views/accounts/new.html.erb </p> <pre><code>&lt;% for user in @account.users %&gt; &lt;% fields_for "account[user_attributes][]", user do |account_fields| %&gt; &lt;p&gt;Login : &lt;%= account_fields.text_field :login %&gt; &lt;p&gt;Email : &lt;%= account_fields.text_field :email %&gt; &lt;p&gt;Password : &lt;%= account_fields.password_field :password %&gt; &lt;p&gt;Confirm Password : &lt;%= account_fields.password_field :password_confirmation %&gt; &lt;%= account_fields.hidden_field :account_id, :value =&gt; :id %&gt; &lt;% end %&gt; &lt;% end %&gt; &lt;% for role in @account.users.first.roles %&gt; &lt;% fields_for "account[role_attributes]]", role do |role_fields| %&gt; &lt;%= role_fields.hidden_field :role_ids, :value =&gt; '[1]' %&gt; &lt;% end %&gt; &lt;% end%&gt; </code></pre> <p>Associated setter methods in the account.rb model: using the stacktrace I have isolated the problem to "undefined method `roles' for #" on line 34, marked below:</p> <pre><code>def user_attributes=(user_attributes) user_attributes.each do |attributes| users.build(attributes) end end def role_attributes=(role_attributes) role_attributes.each do |attributes| users.roles.build(attributes) #error here (stacktrace) end end </code></pre> <p>finally, within the accounts controller I build the users and roles in memory:</p> <pre><code> def new @account = Account.new 1.times { @account.users.build } 1.times { @account.users.first.roles.build } </code></pre> <p>The @accounts.users.first.roles.build proof from consol: </p> <pre><code>&gt;&gt; account =&gt; #&lt;Account id: 1, subdomain: "justinzollars", created_at: "2010-02-08 14:41:13", updated_at: "2010-02-08 14:41:13"&gt; &gt;&gt; account.users =&gt; [#&lt;User id: 13, login: "jayz", email: "jz@jz.com", crypted_password: "f9a3d618fc650d285a90f9775508c13784891b97", salt: "f497a7dd909b695caff1f6310e710245615d55b6", created_at: "2010-02-08 20:25:48", updated_at: "2010-02-08 20:25:48", remember_token: nil, remember_token_expires_at: nil, account_id: 1&gt;, #&lt;User id: 16, login: "jasonwade23", email: "jasonwade@gmail.com", crypted_password: "06581b47cfac7a529773d61dc0b1d5d6c0da6c08", salt: "93f8b99cd9da60b904d553fcc7843bfb66352c3e", created_at: "2010-02-13 07:46:14", updated_at: "2010-02-13 07:46:14", remember_token: nil, remember_token_expires_at: nil, account_id: 1&gt;] &gt;&gt; account.users.first =&gt; #&lt;User id: 13, login: "jayz", email: "jz@jz.com", crypted_password: "f9a3d618fc650d285a90f9775508c13784891b97", salt: "f497a7dd909b695caff1f6310e710245615d55b6", created_at: "2010-02-08 20:25:48", updated_at: "2010-02-08 20:25:48", remember_token: nil, remember_token_expires_at: nil, account_id: 1&gt; &gt;&gt; account.users.first.roles =&gt; [#&lt;Role id: 1, name: "admin"&gt;, #&lt;Role id: 2, name: "alt"&gt;] &gt;&gt; </code></pre>
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