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POHow do I set ActiveRecord model attribute when using .build method with Rails 3.2 (many-to-many)
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copied!<p>I'm working on a sort of project management app with Rails (my Rails skills is kinda rusty). I have two model objects, in this case User and Account, which have a many-to-many relationship (Company could maybe be a better name for Account). When a user signs up a new Account is created (with .build) with help form a nested form. The Account model have two fields name and account_admin. When the the initial user creates it's Account I want to set account_admin to the users id. But I can't get this to work. </p> <p>The models is set up like this:</p> <pre><code>class Account < ActiveRecord::Base attr_accessible :name, :account_admin validates_presence_of :name has_many :projects, dependent: :destroy has_many :collaborators has_many :users, through: :collaborators end class User < ActiveRecord::Base has_secure_password attr_accessible :email, :name, :password, :password_confirmation, :accounts_attributes has_many :collaborators has_many :accounts, through: :collaborators accepts_nested_attributes_for :accounts [...] </code></pre> <p>The UserController looks like this:</p> <pre><code>def new if signed_in? redirect_to root_path else @user = User.new # Here I'm currently trying to set the account_admin value, but it seems to be nil. account = @user.accounts.build(:account_admin => @user.id) end end </code></pre> <p>I have also tried to move <code>account = @user.accounts.build(:account_admin => @user.id)</code> to the create action, but the the field disappears from the form. </p> <p>What would be the appropriate way to accomplish what I want (set account_admin to the users id when it is getting created)? Or is there a better approach to find out which user created the account (ie. do something with the relationship table)? </p> <p><strong>Update</strong></p> <p>With help from @joelparkerhenderson I think I got it to work. I made a method in my User model that looks like this:</p> <pre><code>def set_account_admin account = self.accounts.last if account.account_admin == nil account.account_admin = self.id account.save end end </code></pre> <p>Which I call with <code>after_create :set_account_admin</code>. This works, but is there a more "Rails way" to do the same?</p> <p>Thanks. </p>

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