saving to two different models - accepts_nested_attributes_for not working

I’m having trouble with saving to two different models, from one form… I tried to follow rails casts #196 and looked at several other examples here at stackoverflow but I haven’t figured out how to do
this because my case is a little bit different…

So, I have two models:

  class Patient < ActiveRecord::Base
attr_accessible :date_of_birth, :patient_name
has_many :samples
class Sample < ActiveRecord::Base
attr_accessible :approved, :patientID, :result, :patient
belongs_to :patient
accepts_nested_attributes_for :patient

What I found on most of the examples I saw, including the railscasts,
is to create a new sample inside the patient form, and the “accepts_nestes_attributes_for” is inside the “patient” model… But what I want to do is exactly the opposite, that is, creating a new patient inside the new sample form.

Here’re my views, I have a normal form for the sample and then a partial for the patient part:


  <%= form_for(@sample) do |f| %>
<% if @sample.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@sample.errors.count, "error") %> prohibited this sample from being saved:</h2>
<% @sample.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
<% end %>
<div class="field">
<%= f.label :result %><br />
<%= f.text_area :result %>
<div class="field">
<%= f.label :approved %><br />
<%= f.check_box :approved %>
<div><%= render 'patient' %></div>
<div class="actions">
<%= f.submit %>
<% end %>


    <%= fields_for :patient do |p| %>
<div class="field">
<%= p.label :patient_name %><br />
<%= p.text_field :patient_name %>
<div class="field">
<%= p.label :date_of_birth %><br />
<%= p.date_select :date_of_birth %>
<% end %>

When I click the submit button everything seems to work, but nothing is saved into the patients table.

Here’s the log:

  Started POST "/samples" for at 2013-10-12 23:32:03 +0100
Processing by SamplesController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"13OKZ8DaGJ4zTb35q+ymSzx7r+Ipxou1u+XrR4jtyeI=", "sample"=>{"result"=>"teste 3", "approved"=>"0"}, "patient"=>{"patient_name"=>"Joao", "date_of_birth(1i)"=>"2013", "date_of_birth(2i)"=>"10", "date_of_birth(3i)"=>"10"}, "commit"=>"Create Sample"}
(0.1ms) begin transaction
SQL (0.5ms) INSERT INTO "samples" ("approved", "created_at", "patientID", "result", "updated_at") VALUES (?, ?, ?, ?, ?) [["approved", false], ["created_at", Sat, 12 Oct 2013 22:32:03 UTC +00:00], ["patientID", nil], ["result", "teste 3"], ["updated_at", Sat, 12 Oct 2013 22:32:03 UTC +00:00]]
(2.4ms) commit transaction
Redirected to http://localhost:3000/samples/3
Completed 302 Found in 6ms (ActiveRecord: 2.9ms)

As you can see in the log, it’s only saving to the sample table. Can I
use accepts_nested_attributes_for this way? Is there a way to achieve what I want? Or should I try a different approach?

After I solve this I will try to check first if the patient exists or
not before committing and try to do as SAYT on the patient’s name… but that’s a future step!

Thanks for your help

I’ve also have this question posted on stackoverflow, and there’s a little bit more info there because of a reply I’ve got. If you want to take a look into it:

Any more ideas on how I might solve this?

Segunda-feira, 14 de Outubro de 2013 10:28:12 UTC+1, Luis Bivar Ramos escreveu: