Rails Render part of a form inside another form

Question

I have a page in which you create an invoice. There is a separate section that allows you to add payments to invoices. What I'm wanting to do is add the ability to create a payment when creating an invoice.

I'm wanting to render the "Create Payment" form VIEW into the "Create Invoice" form VIEW. How can I do this? Here is some code:

Invoice Form view (notice the render call):

<%= form_for(@contract) do |f| %>
  <div class="field">
    f.label "Add payment?"
    <div id="pay_form">
      <%= render 'payments/pay_form' %>
    </div>
</div>

(_pay_form.html.erb) The partial from the create payment form (notice I'm not including the form_for tag here because I don't want to next a form inside of another form on the Invoice page above):

<div class="field">
  <%= f.label 'Amount Paid:' %>
  <%= f.text_field :amount %>
</div>
<div class="field">
  <%= f.label 'Payment Method' %>
  <%= f.select :method, %w(Cash Credit Check) %>
</div>

The main problem is the f variable in the partial doesn't exist. And even if I assign the Invoice's f var from it's form, the names of the params would be params[:invoice][:amount] rather than params[:payment][:amount]. See what I'm saying?

What's the best way to go about doing this?

Did you check accepts_nested_attributes_for and fields_for helper? — Alper Karapınar
– Alper Karapınar, Commented Aug 3, 2012 at 20:01

rickypai · Accepted Answer · 2012-08-03 20:10:13Z

10

You need to pass the f variable from the view to the partial.

To do this, change

<%= render 'payments/pay_form' %>

into

<%= render 'payments/pay_form', f: f %>

Should you encounter name errors, since both are named f

try:

<%= render :partial => 'payments/pay_form', :locals => { :f => f} %>

or

<%= form_for(@contract) do |builder| %>
  <div class="field">
    builder.label "Add payment?"
    <div id="pay_form">
      <%= render 'payments/pay_form', f: builder %>
    </div>
</div>

Hope this helps.

For further learning, I think what you are really looking for is nested forms.

Here are some good tutorials on this subject, if you are interesting in learning about them:

http://railscasts.com/episodes/196-nested-model-form-part-1 http://railscasts.com/episodes/197-nested-model-form-part-2

answered Aug 3, 2012 at 20:10

rickypai

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1 Comment

Wes Foster Over a year ago

Thanks for this response. Because of how I have it, the payments aren't directly associated with the contracts, so originally I ignored the idea for accepts_nested_attributes_for. However, I completely forgot about the fields_for helper, which is exactly what I was needing to be able to use the partial (which used formbuilder vars f) without creating another form inside the original form. You led me down the right path!

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