Nested rails forms with Simple Form?

Question

How can I achieve a nested rails form? Im having trouble getting this setup properly. Right now I have:

<%= simple_form_for @user do |f| %> <%= f.input :city %> <%= f.input :address %> <%= f.input :zipcode %> <%= f.association :interests, :as => :check_boxes, :label => false %> <%= f.association :holidays, :as => :check_boxes, :label => false %> <%= f.simple_fields_for :friend_birthdays do |friend_birthday| %> <%= f.input :name %> <%= f.input :gender, :collection => ['male','female'] %> <% end %> <%= f.button :submit %> <% end %>

f.association is working fine for my interests & holidays models as they only need to collect a single attribute each. However, the friend_birthdays model has the same exact relationship as (interests & holidays) with the user model but requires multiple attributes to be edited/added. Any ideas?

pduey · Accepted Answer · 2012-05-15 19:03:16Z

If you are using Rails 3+, then it handles nested forms without any additional gems. The key is in using the "accepts_nested_attributes_for" method on the associations in your model, and the fields_for method on the form helper. Read up on them here and here.

I've never used simple_form, but I believe it drove the nested form development in Rails. So, taking a guess, you need to write your nested form references as:

<%= f.simple_fields_for :friend_birthdays do |friend_birthday| %> <%= friend_birthday.input :name %> <%= friend_birthday.input :gender, :collection => ['male','female'] %> <% end %>

The point being, you need to call the helpers on the nested form, not the parent form.

great thanks.. What do i add to my controller to make this work?
The controller corresponds to the parent model in this nesting, so that create/update action would call create/update on the parent model. The accepts_nested_attributes_for takes care of calling create/update on the children. In your case, User.

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