没有路线匹配[GET]

Question

I'm trying to add 'add to cart' method for my items.

items_controller:

def to_cart
  @item = Item.friendly.find(params[:id]) 
  @item.add_to_cart
  redirect_to root_path
end

routes:

resources :items do
  put :to_cart, on: :member
end

model:

def add_to_cart
  current_user.cart.items << self
  current_user.cart.save
end

show:

<%= @item.name  %>
<%= link_to 'add to cart', to_cart_item_path(@item) %>

I got RoutingError: No route matches [GET] "/items/first/to_cart" 'first' because of friendly id. What I did wrong?

Answer 1

添加method: :put默认情况下，在您的链接中输入method: :put是GET而Rails尝试使用GET方法查找路线

<%= link_to 'add to cart', to_cart_item_path(@item), method: :put %>

Answer 2

Links on the web only send GET requests.

To send a POST/PUT/PATCH/DELETE request you need to use a form.

<%= form_for to_cart_item_path(@item), method: :put do |f| %>
  <% f.submit 'Add to cart' %>
<% end %>

Rails provides a shortcut for this button_to( 'add to cart', to_cart_item_path(@item) ) .

The Rails UJS driver (unobtrusive javascript driver) also provides a method that creates a form in the client when the link element has the data-method attribute:

<%= link_to 'add to cart', to_cart_item_path(@item), method: :put %>