CODEWITHSUNDEEP
ruby-on-railsnested-formsfields-for
Adrian
Adrian

Reputation: 535

Rails build fields_for once inside fields_for

in my

<%= nested_form_for @object do |f| %>

I've a nested_form like:

<%=f.fields_for :nested, :url => { :action => "new" } do |build| %>
   <%= render 'nested_fields', :f => build %>
<% end %>

and inside that nested_field, I've another fields_for :nested2

My Problem is: I want nested2 appearing 1 time, when nested is called. I tried inside the new action of the nested controller the

@nested = Nested.new
@nested.nested2.build

but this does only work for the "real" new action. Is there any solution for that problem?

I'm using the "nested_form" gem.

Upvotes: 2

Views: 2881

Answers (1)

zkcro
zkcro

Reputation: 4344

fields_for lets you specify a particular object to render the fields for, so if you want your nested_fields partial to contain nested fields for a single, newly build nested2 model, you can do it in the fields_for call itself, like this:

# '_nested_fields.html.erb'

...
<%= f.fields_for :nested2, f.object.build_nested2 do |build| %>
  <%= ... %>
<% end %>

This is assuming that Nested has_one :nested2, if it's a has_many association the fields_for arguments would be slightly different:

<%= f.fields_for :nested2s, f.object.nested2s.build do |build| %>

f.object allows you to access the form builder's object, and you can then use it's association methods (based on the association type) to build the new object at that point.

Upvotes: 3

Related Questions