parameters are in the console but not passing to the database - ruby-on-rails

Question

in Main form
<%= p.fields_for :prd_allisland_flat_deliveries do |i| %>
<%= render(:partial => 'prd_allisland_flat_delivery_field', :locals => {:f => i})%>
<% end %>
in the prd_allisland_flat_delivery_field form partial
<div class="row" style="padding-bottom: 25px">
<div class="col-md-2"></div>
<div class="col-md-4">
<%= f.label :delivery_period %>
</div>
<div class="col-md-4">
<%= f.text_field(:delivery_period, {placeholder: '0', class: 'form-control input_border input_field_text_align_right'})%>
</div>
<div class="col-md-2"></div>
</div>
<div class="row" style="padding-bottom: 25px">
<div class="col-md-2"></div>
<div class="col-md-4">
<%= f.label :delivery_rate %>
</div>
<div class="col-md-4">
<%= f.text_field(:delivery_rate, {placeholder: 'Rs. 0.00', class: 'form-control input_border input_field_text_align_right'})%>
</div>
</div>
in prd_item controller
**def new
#item = PrdItem.new
#item.build_prd_allisland_flat_delivery
end**
after writing this the create method
**
if #item.save
if #item.delivery_type == 1
#all_island_flat = PrdAllislandFlatDelivery.new(item_params[:prd_allisland_flat_deliveries_attributes])
#all_island_flat.save
end
end**
the item_params
def item_params
params.require(:prd_item).permit(:item_name, :brand, :item_no, :short_description, :long_description, :prd_type_id, :usr_vendor_property_id, :price,:base_price, :price_discount, :percentage_discount, :stock_count, :availability, :tags, :remove_image, :delivery_type , :min_stock_count,
prd_item_images_attributes: [:id, :image, :description, :link, :_destroy ],
prd_temp_variation_stores_attributes: [:id, :product_variations, :variation_items, :_destroy],
prd_temp_compound_stores_attributes:[:id,:compound, :compound_item, :_destroy],
prd_temp_spec_stores_attributes:[:id,:compound, :compound_item, :_destroy],
prd_allisland_flat_deliveries_attributes: [:id,:delivery_period,:delivery_rate],
prd_province_vise_deliveries_attributes: [:id , :province_name , :delivery_rate, :delivery_period]
)
end
the rails consoler gets the attributes for the prd_allisland_flat_deliveries but the prd_all_island_flat_deliveries fill with null values

Answer 1

Is that your full create method? If so you need to understand that every request is separate from others, the create request doesn't know what happened in the new request.
In your create method you need to build your basic object, then update the object from the params.
def create
#item = PrdItem.new
#item.update(item_params)
if #item.save ...