在Rails4应用程序中按ID查找对象

Question

我在rails 4应用程序中使用Wicked构建了一个向导。我特别遵循了本指南，唯一的区别是我使用的是嵌套资源。我在控制器操作中遇到了困难，这些操作本应使用表单的ID找到表单正在构建的对象。

应用程序的当前流程是用户单击创建对象的按钮，然后重定向到向导的第一步，向导会在一系列步骤中更新对象。问题是我没有通过参数传递对象的ID，因为我在ID字段中传递向导的步骤。

创建对象的按钮

<%= link_to business_loan_application_path(@user), method: :post, :class => "btn btn-success" do %><% end
%>

贷款应用程序控制器

    def create
      @user = current_user
      @loanapplication = @user.loan_applications.new
      @loanapplication.save(validate: false)
      redirect_to business_loan_application_wizard_path(@user.id,LoanApplication.form_steps.first)
    end  

我需要以某种方式将：loan_application_id传递到business_lan_application_wizard_path参数中。

错误

Couldn't find LoanApplication without an ID

贷款应用程序通过has_many关系属于业务。

{"business_id"=>"55", "id"=>"business_details"}

business_details是向导的第一步。这些是当我第一次通过带有put请求的按钮创建对象时传递的参数。

向导控制器

class WizardController < ApplicationController
  include Wicked::Wizard
  before_filter :authenticate_user!
  before_filter :require_business
  steps *LoanApplication.form_steps
  def show
    @business = current_user
    @loanapplication = LoanApplication.find(params[:loan_application_id])
    render_wizard
  end
  def update
    @business = current_user
    @loanapplication = @business.loan_applications.last
    @loanapplication.update_attributes(loan_application_params(step))
    render_wizard @loanapplication
  end
end

Answer 1

这个问题中的讨论帮助解决了这个问题。

已更改

resources :wizard

至

scope "loan_application/:loan_application_id" do
  resources :wizard
end

在我的routes.rb文件中。

我的向导控制器现在如下：

def show
  @business = current_user
  @loanapplication = LoanApplication.find(params[:loan_application_id])
  render_wizard
end
def update
  @business = current_user
  @loanapplication = LoanApplication.find(params[:loan_application_id])
  @loanapplication.update_attributes(loan_application_params(step))
  render_wizard @loanapplication
end

最后，贷款申请控制器重定向链接已更改：

def create
  @user = current_user
  @loanapplication = @user.loan_applications.new
  @loanapplication.save(validate: false)
  redirect_to business_loan_application_wizard_path(@user.id, LoanApplication.form_steps.first, :loan_application_id => @loanapplication.id) 
end