simple_form 关联不保存belongs_to id

Question

我有一个 recipient 和 category 模型。这是 1 个类别的简单关联，有许多收件人。当我尝试更新recipient 表单并分配category 时，它不会保存到记录中。如果我使用控制台并手动更新记录，例如Recipient.update(9, category_id: 13)，我看到分配给收件人的类别正确，但是当我尝试编辑/更新记录时，它不会保存到新选择的类别。

这是我的recipient 模型

class Recipient < ActiveRecord::Base
  belongs_to :category

  accepts_nested_attributes_for :category
end

这是我的category 模型

class Category < ActiveRecord::Base
  has_many :recipients
  validates :category, presence: true

  default_scope { order('category')}
end

这里是recipient 控制器

class RecipientsController < ApplicationController
  def index
    @recipients = Recipient.order(:recipient_name).page(params[:page])
  end

  def new
    @recipient = Recipient.new
  end

  def show
    @recipient = Recipient.find(params[:id])
  end

  def create
    @recipient = Recipient.new(recipient_params)
    if @recipient.save
      redirect_to recipients_path
    else
      render :new
    end
  end

  def edit
    @recipient = Recipient.find(params[:id])
  end

  def update
    @recipient = Recipient.find(params[:id])

    recipient_params = params.require(:recipient).permit(:recipient_name, :alternate_name, :description, :city, :state, :country, category_attributes: [:category, :id])
    @recipient.update_attributes(recipient_params)

    redirect_to recipient_path(id: @recipient.id)
  end

  def destroy
    @recipient = Recipient.find(params[:id])
    @recipient.destroy

    redirect_to recipients_path
  end

  private
  def recipient_params
    params.require(:recipient).permit(:recipient_name, :alternate_name, :description, :city, :state, :country, product_attributes: [:product_name, recipient_products: [:recipient_id, :product_id]], channel_attributes: [:channel_name, recipient_channels: [:recipient_id, :channel_id]],  category_attributes: [:id, :category])
  end

end

这是edit 视图

<div class="row">
  <div class="col-sm-6">
    <h2>Edit <%= @recipient.recipient_name %></h2>

    <%= simple_form_for @recipient do |form| %>
      <%= form.error_notification %>
      <%= form.input :recipient_name, placeholder: 'Recipient', label: 'Recipient Name' %>
      <%= form.input :alternate_name, placeholder: 'Alternate Name' %>
      <%= form.association :category, label_method: :category, value_method: :id %>
      <%= form.input :description, placeholder: 'Description'%>
      <%= form.input :city, placeholder: 'City'%>
      <%= form.input :state, placeholder: 'State' %>
      <%= form.input :country, as: :country, priority: ['US', 'CA'] %>
      <%= form.button :submit, 'Update Recipient', {:class=>"btn btn-secondary"} %>
      <%= link_to "Cancel", :back, {:class=>"btn btn-default"} %>
    <% end %>
  </div>
</div>

这是我的routes.rb 文件

Rails.application.routes.draw do
  root to: 'home#index'
  resources :media_points
  resources :products
  resources :channels
  resources :recipients
  resources :media_point_products
  resources :distributions
  resources :categories do
    resources :recipients
  end
  get '/listing' => "listing#index"
  devise_for :admins
  devise_for :users
  resources :users
end

Answer 1

我写它作为答案，因为格式在 cmets 中很痛苦：

从以下位置更改您的 recipient_params 私有方法： category_attributes: [:category, :id]

到

 category_id: param_that_has_category_id_here

此外，您有两个收件人路由，它将使用第一个匹配的路由，该路由不是您进一步向下的类别路由中的嵌套收件人。如果您的私有方法中的第一次更改没有修复它，我会以简单形式指定嵌套情况，如下所示，因为您可能希望使用嵌套路由：

  simple_form_for [@category, @recipient], url: 'nested_route_path_here' do |f|

只需将@category = Category.new 添加到收件人控制器中的新操作，然后在您的创建操作中，您将通过 params[:category_id] 发送类别参数