how to get form parameters while using fields_for with nested attributes

hi all…
i am trying to use fields_for to get and save nested attributes in a form.
i have a ‘Partner’ model associated with an ‘Address’ model.
partner has_many :addresses

although the form is displaying fine, but on submitting it the following error is shown:

**can't convert HashWithIndifferentAccess into Array**

on this line:
@partner =[:partner])

the names of main ‘partner’ fields are like:


the names of ‘address’ fields are like:


some code:

<% form_for(@partner) do |f| %>
<%= f.error_messages %>

<%= f.label :par_name, “Partner Name” %>

<%= f.text_field :par_name %>
<% f.fields_for :addresses do |addr_fields| %>

<%= addr_fields.label :add_line_1, “Address Line 1” %>

        <%= addr_fields.text_field :add_line_1 %>
  <% end %>

<%= f.submit “Create” %>
<% end %>

what’s wrong over here??


Take a look at the complex forms railscasts series (

Cheers, Sazima

thanx for the link.. now i am able to save an address along with a
partner. but the partner_id (foreign key for partner) inside address
table is not getting filled up. do i need to manually put the foreign
key, if so how do i do it.