[英]Rails - Shopping Cart - How to increase quantity for a specific item in the current cart
My user has selected a product. 我的用户选择了一个产品。
Now he is in his shopping cart and he finally wants two of this item 现在他在购物车中,他最终想要其中两个
So in the cart there is a form to increase the quantity 因此,在购物车中有一种增加数量的形式
order_items/index.html.erb ORDER_ITEMS / index.html.erb
<% @items.each do |item| %>
<%= image_tag(item.product.attachments.first.url, class: "tiny_image") %>
<%= link_to item.product.title, clients_product_path(item.product_id), class: "title_in_tab" %>
<%= item.quantity %>
<%= number_to_currency_euro item.product.price %>
<%= item.size.size_name %>
<%= form_for edit_clients_order_item_path(item), method: :patch, remote: true do |f| %>
<%= f.hidden_field :id, value: item.id %>
<%= f.hidden_field :product_id, value: item.product.id %>
<%= f.hidden_field :size_id, value: item.size.id %>
<%= f.select :quantity, [1,2,3,4,5] %>
<%= f.submit "Modifier" %>
<% end %>
<%= link_to clients_order_item_path(item), method: :delete, remote: true ,data: {confirm: "Voulez vous vraiment supprimer cet article?"} do %>
<i class="fa fa-trash"></i>
<% end %>
in the shopping_car.rb 在shopping_car.rb中
I have this method to inscrease the quantity 我有这种方法来增加数量
def inscrease_item(id:, quantity:1, product_id:, size_id:, user_id:, order_id:)
@size = Size.find_by(id: size_id)
@order_item = order.items.find_by(product_id: product_id, size_id: size_id)
@order_item.quantity = quantity.to_i
@order_item.save
update_sub_total!
@size.quantity -= quantity.to_i
@size.save
end
in order_items_controller.rb I have: 在order_items_controller.rb中,我有:
def edit
@item = OrderItem.find(params[:id])
end
def update
binding.pry
@item = current_cart
current_cart.inscrease_item(
id: params[:id],
order_id: params[:order_id],
product_id: params[:product_id],
quantity: params[:quantity],
user_id: params[:user_id],
size_id: params[:size_id])
end
private
def order_item_params
params.require(:order_item).permit(:id, :product_id, :user_id, :quantity, :size_id, :order_id)
end
I added a break point in the update method: 我在更新方法中添加了一个断点:
@item returns nil and I don't know what is wrong... @item返回nil,我不知道怎么了...
this is what returns binding pry 这就是返回绑定撬
30: def update
31: binding.pry
=> 32: @item = OrderItem.find(params[:id])
33: @item.inscrease_item(
34: order_item_params
35: )
36: end
[1] pry(#<Clients::OrderItemsController>)> @item
=> nil
[2] pry(#<Clients::OrderItemsController>)> params
=> <ActionController::Parameters {"utf8"=>"✓", "_method"=>"patch", "/clients/cart/items/111/edit"=>{"id"=>"111", "product_id"=>"19", "size_id"=>"41", "quantity"=>"4"}, "commit"=>"Modifier", "controller"=>"clients/order_items", "action"=>"update"} permitted: false>
@item
isn't set yet because the arrow on the side points to the next statement to execute. 尚未设置
@item
因为侧面的箭头指向要执行的下一条语句。 Therefore @item = OrderItem.find(params[:id])
has not been executed yet. 因此,@
@item = OrderItem.find(params[:id])
尚未执行。 Move the break point one line lower or step one statement further. 将断点下移一行或进一步执行第一条语句。
Furthermore you're passing a wrong argument to the form_for
helper. 此外,您将错误的参数传递给
form_for
助手。 The first argument should be an record or symbol/string representing the object. 第一个参数应该是代表对象的记录或符号/字符串。 You might want to use the
form_with
helper instead using the :url
option. 您可能要使用
form_with
帮助器,而不是使用:url
选项。
Last but not least, as you can see in your params (from your pry output), currently the data is present, but nested inside the params hash. 最后但并非最不重要的一点,如您在params中(从pry输出中看到的)所看到的,当前数据存在,但嵌套在params哈希中。
{
"utf8" => "✓",
"_method" => "patch",
"/clients/cart/items/111/edit" => {
"id" => "111",
"product_id" => "19",
"size_id" => "41",
"quantity" => "4"
},
"commit" => "Modifier",
"controller" => "clients/order_items",
"action" => "update"
}
The data should also be accessed like such. 数据也应该这样访问。
params['/clients/cart/items/111/edit'][:id] #=> "111"
# ^ this is due to the wrong first argument
# of the form_for helper
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