ruby-on-rails - Rails 4 嵌套表单未在显示/编辑时加载值

Question

我有一个带有嵌套产品表单的订单表单。产品正确保存到数据库，但显示/编辑产品值未加载 - 字段显示但未填充。

订货型号:

has_many :products, dependent: :destroy
accepts_nested_attributes_for :products

产品型号:

belongs_to :order

订单 Controller :

before_action :set_order, only: [:show, :edit]

def new
  @order = Order.new
  @order.products.build
end

def show
  # empty
end

def edit
  # empty
end

def order_params
  params.require(:order).permit(
    :number,
    :price,
    products_attributes: [
      :id,
      :type,
      :color
    ])
end

def set_order
  if params[:id].present? && user_signed_in?
    @order = Order.find(params[:id])
  elsif params[:number].present? && params[:email].present?
    @order = Order.find_by(number: params[:number], email: params[:email])
  else
    redirect_to welcome_index_path, alert: I18n.t('views.welcome.index.no_order_found')
  end
end

路线.rb:

resources :orders do
  get 'express', on: :new
end
post 'orders/status', to: 'orders#show'

_form.html.erb(编辑和显示都使用):

<%= form_for @order do |f| %>
  <%= f.text_field(:number) %>
  # etc.
  <%= f.fields_for :products do |g| %>
    <%= g.text_field(:color) %>
    # etc.
  <% end %>
<% end %>

Answer 1

你的代码看起来不错，它应该可以工作。您能否尝试以下更改以通过 @products在表单域中

<%= f.fields_for :products, @products do |g| %>
   <%= g.text_field(:color) %>
   # etc.
<% end %>

只需制作 @products变量在 new 中可用和 edit行动。喜欢以下

def new
  #your code goes here ...
  @products = @order.products.build
end


def edit
  #your code goes here ...
  @products = @order.products
end