Saving to two different models - accepts_nested_attributes_for not working

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

<%= pluralize(@sample.errors.count, “error”) %> prohibited
this sample from being saved:

  <% @sample.errors.full_messages.each do |msg| %>
    <li><%= msg %></li>
  <% end %>

<% end %>

<%= f.label :result %>
<%= f.text_area :result %>
<%= f.label :approved %>
<%= f.check_box :approved %>
<%= render 'patient' %>
<%= f.submit %>
<% end %>


<%= fields_for :patient do |p| %>

<%= p.label :patient_name %>
<%= p.text_field :patient_name %>
<%= p.label :date_of_birth %>
<%= 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”=>“✓”,
“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
(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
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
before committing and try to do as SAYT on the patient’s name… but
a future step!

Thanks for your help

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

Any more ideas on how I might solve this?

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