1 Form > 2 Models > 2nd Model Requres 1st Model ID

Rails
1

Hey Everyone,

So I have one form that submits information to create 2 models (A, B).
I need the ID of model A to be inserted into model B. But the ID isn’t
created until it hits the database (auto_increment). But if for some
reason either item cannot be created or saved I want to abort the
whole operation.

Whats the best method to do this ?

thanks.

2

google “rails 1 form 2 models”

3

I can handle building two models from 1 form. It’s getting the id from
the first saved model and inserting it in the second and rolling back
the whole transaction if anything goes wrong that is the problem.

4

Hi brianp
From what I understood you have to put the whole thing in a
transaction like

ActiveRecord::Base.transaction do
save first model object
save second model object
end

Sijo

5

Thanks everyone for your suggestions.

This is what I came up with I was looking for some feedback. It works
fine but I figure I might be doing something long winded. This is my
first go at an actual railsApp other then book demos. Any feedback
would be nice!

// new.html.erb

New word

<%= error_messages_for :word, :definition %>

<% form_for(@word) do |f| %>

<%= f.label :word %>
<%= f.text_field :word %>

<%= f.label :was_created_by %>
<%= f.check_box :was_created_by %>

<% fields_for(:definition, @definition) do |i| %>


<%= i.label :definition %>

<%= i.text_area :definition %>



<%= i.label :word_type %>

<%= i.text_field :word_type %>



<%= i.label :pronounciation %>

<%= i.text_field :pronounciation %>



<%= i.label :origin %>

<%= i.text_area :origin %>



<%= i.label :is_profain %>

<%= i.check_box :is_profain %>


<% end %>

<%= submit_tag 'Create' %>

<% end %>

<%= link_to ‘Back’, words_path %>

// words_controller.rb
def create

@client_ip = request.remote_ip

begin
  ActiveRecord::Base.transaction do
    @word = Word.new(params[:word].merge(:ip_address =>

@client_ip, :user_id => ‘1’))
@word.save
@definition = Definition.new(params[:definition].merge
(:ip_address => @client_ip,
:user_id
=> ‘1’,
:word_id
=> @word.id,
:status
=> ‘published’))
@definition.save
end
rescue ActiveRecord::RecordInvalid => invalid
flash[:notice] = ‘Word was not created’
render :action => “new”
end

redirect_to(@word)

end