nested attributes and initialization

Bradley
Wed, 30 Dec 2009 01:46:33 -0000

I have a user model that has a few different roles (say a client and
an agent)  The agent has some extra relationships not found in a
client role (has_one :agent_profile, for instance)

I have an edit_profile action for an agent that has these nested
attributes in the form and the model
accepts_nested_attributes_for :agent_profile:

<% form_for @agent, :url => agent_path(@agent) do |form| %>
  <%= form.label :name %>
  <%= form.text_field :name %>

  <% form.fields_for :agent_profile do |a_form| %>
	<%= a_form.label :website, "Website Address:"%>
	<%= a_form.text_field :website %>
  <% end %>
<% end %>

If an agent_profile object isn''t present however, when an agent edits
their profile, they get the:

ActionView::TemplateError (You have a nil object when you didn''t
expect it!
The error occurred while evaluating nil.new_record?

Is it common that I would have an after_initialize method such as:

  def after_initialize
    self.build_agent_profile if self.role_name == "agent" && !
self.agent_profile
  end

Seems a bit odd to me to do this for all relationships I have that
accept nested attributes, but I can''t really think of a better way.  I
also don''t want to split the User model into two models because agents
and clients log in/sign up in the same way.

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