Question

在我的应用中，我将参数从一个控制器传递到另一个控制器

首先我创建Company对象并在重定向链接中传递其id参数

companies_controller：

class CompaniesController < ApplicationController

  def new
    @company = Company.new
  end

  def create
    @company = current_user.companies.build(company_params)
    if @company.save
      redirect_to new_constituent_path(:constituent, company_id: @company.id)
    else
      render 'new'
    end
  end

  private

    def company_params
      params.require(:company).permit(:name)
    end

end

成功Company保存后，我被重定向到创建Constituent对象。我使用链接company_id中传递的参数填充entrepreneur_id或http://localhost:3000/constituents/new.constituent?company_id=9，例如

成分/新：

  = simple_form_for @constituent do |f|
    = f.input :employees
    - if params[:entrepreneur_id]
      = f.hidden_field :entrepreneur_id, value: params[:entrepreneur_id]
    - elsif params[:company_id]
      = f.hidden_field :company_id, value: params[:company_id]
    = f.button :submit

constituents_controller：

class ConstituentsController < ApplicationController

  def new
    @constituent = Constituent.new
  end

  def create
    @constituent = Constituent.create(constituent_params)
    if @constituent.save
      redirect_to root_url
    else
      render 'new'
    end
  end

  private

    def constituent_params
      params.require(:constituent).permit(:employees, :company_id, :entrepreneur_id)
    end

end

问题是我在链接中传递的参数在尝试保存@constituent失败并且company_id或entrepreneur_id为nil后失败。我该如何解决？

Answer 1

这是因为在您提交表单后，不再有params[:company_id] = 9。 render :new完成后，您将获得params[:constituent][:company_id] = 9。

因此，要解决此问题，您需要将此get请求发送给新的Constituent：

http://localhost:3000/constituents/new?company_id=9

但是这样的事情：

http://localhost:3000/constituents/new?constituent[company_id]=9

如果params[:constituent]不存在，为了避免错误，您的观点会变得更加丑陋：

- if params[:constituent]
  - if params[:constituent][:entrepreneur_id]
    = f.hidden_field :entrepreneur_id, value: params[:constituent][:entrepreneur_id]
  - elsif params[:constituent][:company_id]
    = f.hidden_field :company_id, value: params[constituent][:company_id]

提交失败后通过params drop

1 个答案: