ruby on rails - Prefill nested model fields with simple_form -

is possible prefill simple_fields_for ?

i have users, has_one backpack, has_may pockets, each pocket has_many items.

i created default backpack, , prefill user form backpack fields datas default backpack.

i tried think of:

1 - in controller

@default_backpack = backpack.first @backpack = @default_backpack.deep_clone include: [ :pockets, { pockets: :items } ] @backpack.save @user.backpack = @backpack 

but leads me couldn't find backpack id=597 user id=

2- in view

<%= f.simple_fields_for :ibackpack, @default_backpackdo |bkpk| %> <%= render 'backpacks/form', f: bkpk %> <% end %> 

which leads me weird behaviour: backpack fields pre-filled, child fields (pockets , items) empty. start form simple

<%= simple_form_for @user |f| %> 

here's simple_fields_for

<%= f.simple_fields_for :invoice_quote_element, @invoice_quote_element |iqe| %>    <%= render 'briefs/quote_proposal', f: iqe %>  <% end %> 

along of partials used:

backpack

<div class="col-xs-12">    <%= f.input :rate, placeholder: t('simple_form.placeholders.backpack.rate') %>   <div id="pockets">     <%= f.object.pockets.size %>     <%= f.simple_fields_for :pockets, f.object.pockets.order(:position) |pocket| %>       <%= render 'users/pocket_fields', f: pocket %>     <% end %>   </div>   <div class="row"></div>   <%= link_to_add_association t('simple_form.buttons.add_pocket'), f, :pockets,   partial: 'users/pocket_fields', class: 'add-pocket-link futura-info padding green' %> </div> 

pockets

<div class="col-xs-12 categories-and-items">   <div class="category form-inline" id="category_<%= f.object.id %>">     <%= f.hidden_field :position %>     <div class="form-group col-xs-6">       <%= fa_icon "arrows", class:"blue" %>       <% if current_user.admin? || f.object.user_id.nil? || f.object.user_id == current_user.id %>       <%= f.input :title, label: t('simple_form.labels.pocket.title'), label: false, class: 'text-right', placeholder: t('simple_form.placeholders.pocket.title'), input_html: { class: 'backpack-category-title form-text form-b form-b-all col-xs-12' } %>       <% else %>       <%= f.input :title, label: t('simple_form.labels.pocket.title'), label: false, class: 'text-right', placeholder: t('simple_form.placeholders.pocket.title'), input_html: { class: 'backpack-category-title form-text form-b form-b-all col-xs-12', readonly: true } %>       <% end %>     </div>   <% if current_user.admin? || (f.object.user_id.nil? || f.object.user_id == current_user.id) %>     <div class="form-group col-xs-6">       <%= link_to_remove_association(t('simple_form.buttons.remove_pocket'), f,     { wrapper_class: 'category', class: 'futura-info futura-info-small red remove-item-category' }) %>     </div>   <% end %>     <div class="row"></div>     <div class="col-xs-12 padding-0-2">       <hr>     </div>     <div class="items">     <%= f.object.items.size %>     <%= f.simple_fields_for :items, f.object.items.order(:position) |item| %>       <%= render 'users/item_fields', f: item %>     <% end %>     </div>     <div class="item-link">     <%= link_to_add_association t('simple_form.buttons.add_item'), f, :items,         partial: 'users/item_fields', render_options: { wrapper: 'item' }, class: 'add-item-link futura-info padding green' %>     </div>   </div> </div> 

and items

<br /> <div class="col-xs-12 padding-0-2">   <div class="item form-inline" id="item_<%= f.object.id %>">     <div class="form-group col-xs-6 item-field">       <%= fa_icon "arrows" %>   <% if current_user.admin? || f.object.user_id.nil? || f.object.user_id == current_user.id %>       <%= f.input :title, label: false, required: true, placeholder: t('simple_form.placeholders.item.title'), input_html: { class: 'backpack-item-title form-text form-b form-b-all' } %>       <% else %>       <%= f.input :title, label: false, required: true, placeholder: t('simple_form.placeholders.item.title'), input_html: { class: 'backpack-item-title form-text form-b form-b-all', :readonly => true } %>       <% end %>       <% if current_user.admin? || f.object.user_id.nil? || f.object.user_id == current_user.id %>         <%= f.input :day_based, input_html: { class: 'backpack-checkbox-day-based', placeholder: t('simple_form.placeholders.item.day_based') } %>       <% else %>         <%= f.input :day_based, input_html: { class: 'backpack-checkbox-day-based', placeholder: t('simple_form.placeholders.item.day_based'), disabled: true } %>       <% end %>     </div>     <div class="form-group col-xs-3">     <%= f.input :days, label: false, required: true, input_html: { class: 'backpack-item-days form-text form-b form-b-all', placeholder: t('simple_form.placeholders.item.days') } %>     </div>     <div class="form-group col-xs-3">     <%= f.input :price, label: false, required: true, input_html: { class: 'backpack-item-price item-price-input form-text form-b form-b-all', placeholder: t('simple_form.placeholders.item.price') } %>     </div>     <div class="row"></div>   <% if current_user.admin? || (f.object.user_id.nil? || f.object.user_id == current_user.id) %>     <div class="form-group">       <%= link_to_remove_association(t('simple_form.buttons.remove_item'), f,       { wrapper_class: 'item', class: 'futura-info futura-info-small red remove-item' }) %>     </div>   <% end %>   </div> </div>