form for - Rails 4, show attributes -

if want submit fields of nested resources instead of parent. how can this?

i've got 2 models: product , product_details.

=form_for @product |f|   =f.fields_for product_details |ff|     =ff.radio_button :price, ff.price   =f.submit 

so need submit form above product_details_controller instead of products_controller.

if form_form product_details got "to_key" undefined..

what best way this?

accepts_nested_attributes_for can you.

for example:-

class project < activerecord::base   has_many :tasks   accept_nested_attributes_for :tasks, :allow_destroy => true end 

in view

<% form_for @project |project_form| %>   <% project_form.fields_for :tasks |task_form| %>       <p>         <div>           <%= task_form.label :name, 'task:' %>           <%= task_form.text_field :name %>         </div>      </p>    <%end%> <%= project_form.submit %> <% end %> 

so @project.save save child tasks too.also can modify controller code , way want

try on rails console

>> project = project.first => #<project id: 1, name: "nested models patches", created_at: "2009-01-22 11:17:15", updated_at: "2009-01-22 11:17:15", author_id: 1> >> project.tasks => [#<task id: 1, project_id: 1, name: "write 'em", due_at: nil, created_at: "2009-01-22 11:17:15", updated_at: "2009-01-22 11:17:15">, #<task id: 2, project_id: 1, name: "test 'em", due_at: nil, created_at: "2009-01-22 11:17:15", updated_at: "2009-01-22 11:17:15">, #<task id: 3, project_id: 1, name: "create demo app", due_at: nil, created_at: "2009-01-22 11:17:15", updated_at: "2009-01-22 11:17:15">, #<task id: 4, project_id: 1, name: "scrutinize", due_at: nil, created_at: "2009-01-22 11:17:15", updated_at: "2009-01-22 11:17:15">]  >> project.tasks.second.name = ""  => ""   >> project.valid? => false