将数据从模型呈现到另一个控制器

Question

我对ROR还不熟悉。我正在实施一个网站，创建一个许可证，然后，然后将用户重定向到发票页面。我有一个用户模型，发票模式和许可模式，他们之间有关联如下：

invoice.rb

class Invoice < ApplicationRecord
  belongs_to :user
  has_one :receipt
  belongs_to :permit
end

user.rb

class User < ApplicationRecord
  has_many :permits
  has_many :visitor_permits
  has_many :healthreports
  has_secure_password
end

permit.rb

class Permit < ApplicationRecord
  belongs_to :user
  has_one :invoice
end

我要做的是，用户在申请许可证时填写所有细节，这些信息将保存到许可证模型中。在此之后，用户将被重定向到发票页面，将用户刚刚填写的所有数据呈现在许可证申请页面中，并从许可证模型中提取数据并显示在发票页面上，然后再保存到发票页面中。我不知道该怎么开始。知道怎么做吗？

我有许可证和发票管理员。如果你们需要更多的信息或者我的代码，请告诉我。谢谢!

我尝试的是在发票控制器中创建一个与许可证模型链接的变量，这样我就可以使用它来呈现来自许可模型的数据，然后将它保存到发票模型中。

class InvoiceController < ApplicationController
  def new
    @permits = Permit.find(params[:id])
    @invoice = Invoice.new
  end

  def create
    #@current_user = User.find_by(id: session[:user_id])
    @invoice = current_user.visitor_permits.invoices.build(invoice_params)
    if @invoice.save

    else

    end
  end

  private
  # Use callbacks to share common setup or constraints between actions.
  def set_invoice
    @invoice = Invoice.find(params[:id])
  end

  # Never trust parameters from the scary internet, only allow the white list through.
  def invoice_params
    params.require(:invoice).permit(:vehicle_type, :name, :department, :carplate, :duration, :permitstart, :permitend, :price, :time)
  end
end

但我一直搞错了

ActiveRecord::RecordNotFound in InvoiceController#new
Couldn't find Permit with 'id'=

指向新的行动。

@permits = Permit.find(params[:id])

这是我的permits_controller.rb，一旦按下按钮，它将在创建操作中重定向用户。

class PermitsController < ApplicationController
  before_action :set_permit, only: [:destroy]
  def index
    @permits = Permit.where(:user_id => current_user.id)
  end

  def new
    @permits = Permit.new
  end

  def create
    @permits = current_user.permits.build(permit_params)
    if @permits.save
      redirect_to createinvoice_path(@permits)

    else
      render 'new'
    end
  end


  def destroy
    Permit.destroy_all(user_id: current_user)
    respond_to do |format|
      format.html { redirect_to root_path, notice: 'Permit was successfully canceled.' }
      format.json { head :no_content }
    end
  end

  def confirm
    @fields = %i[vehicle_type, carplate, studentid, name, department, permitstart, permitend]
    @permit = current_user.permits.build(permit_params)
    render :new and return unless @permit.valid?
  end

  def show
    @permits = Permit.find(params[:id])
  end

  def update
    @permits = Permit.where(user_id: current_user).take
    respond_to do |format|
      if @permits.update(permit_params)
        format.html { redirect_to root_path}
        flash[:success] = "Permit successfully updated"
        format.json { render :show, status: :ok, location: @user }
      else
        format.html { render :edit }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end

  def edit
    @permits = Permit.find(params[:id])
    #@permits = Permit.find_or_initialize_by(user_id: params[:id])
  end

  private
  # Use callbacks to share common setup or constraints between actions.
  def set_permit
    @permits = Permit.find(params[:id])
  end

  # Never trust parameters from the scary internet, only allow the white list through.
  def permit_params
    params.require(:permit).permit(:vehicle_type, :name, :studentid, :department, :carplate, :duration, :permitstart, :permitend)
  end
end

Route.db

Rails.application.routes.draw do
  resources :users
  resources :permits do
    collection do
      post :confirm
    end
  end
  resources :visitor_permits do
    collection do
      post :confirm
    end
  end
  resources :invoice
  resources :receipt
  resources :health_report

  root 'static_pages#home'


  get 'permitapplication' => 'permits#new'
  get 'viewpermit' =>'permits#show'
  get 'show_permit' =>'permits#index'
  get 'invoice' => 'permits#invoice'
  post 'createpermit' => 'permits#create'
  post 'permits' => 'permits#create'

  post 'createvpermit' => 'visitor_permits#create'
  post 'vpermits' => 'visitor_permits#create'
  get 'show_vpermit' =>'visitor_permits#index'
  get 'show_visitor_permit' =>'visitor_permits#show'
  get 'visitorpermit' => 'visitor_permits#new'

  get 'createinvoice' => 'invoice#new'
  post 'invoice' => 'invoice#create'

  get 'new_health_report' => 'health_report#new'

  get 'payment' =>'transaction#new'

  get 'homepage/index'

  get 'adminlogin' => 'admin_controller#index'

  get 'patrollogin' => 'patrol_officer#index'

  post 'citations' => 'citations#create'
  get 'new_citation' => 'citations#new'
  get 'unpaid_citations' => 'citations#list_all'
  get 'edit_Citation' => 'citations#edit'

  get 'contact'=> 'static_pages#contact'
  get 'about' => 'static_pages#about'
  get 'help' => 'static_pages#help'

  get 'signup' => 'users#new'
  post 'users' => 'users#create'

  get 'login' => 'sessions#new' #Page for a new session
  post 'login' => 'sessions#create' #Create a new session
  delete 'logout'=>'sessions#destroy' #Delete a session


  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end

Answer 1

我看到您的createinvoice路由没有设置来接受任何额外的参数。默认路由应该生成类似于invoice/new的内容。因此，当在path中发送@permit id时，您需要如下所示：

redirect_to createinvoice_path(permit_id: @permits.id)

在invoice_controller中获取params[:permit_id]

编辑:我不擅长解释，但我会尽力的。您的发票路径是get createinvoice，所以当有人访问yourdomain.com/createinvoice时，它将使用该页面。请注意，路由get createinvoice不包含任何params的占位符，在rails默认生成的显示页面中可以看到如get users/:id。如果路由设置是这样的，那么当我们编写redirect_to users_path(@user)时，rails将使用id of @user并在url中替换它，当页面呈现用户id为3并且在控制器中您可以通过params[:id]访问该id时，它将变成users/3。但是，在您的示例中，路由不是接受任何params的设置，因此rails只是忽略了createinvoice_path中的createinvoice_path，并且由于params中不存在id，所以会出现错误。我建议的是createinvoice_path(permit_id: @permits.id)，如果许可证的id为3，它将把url作为createinvoice/?permit_id=3，所以这会像你在google搜索时看到的那样，将params作为一个查询参数发送。你会得到permit_id在params。

希望你明白我的意思。