傳遞PARAMS滴失敗後提交

Question

在我的應用我傳遞參數從一個控制器到另一個

首先我創建Company對象，並通過其在參數id在重定向鏈接

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 

成功後Company保存我被重定向到創建一個Constituent對象。我填寫company_id或entrepreneur_id與鏈接http://localhost:3000/constituents/new.constituent?company_id=9通過例如參數

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 

的問題是我在鏈接中傳遞的參數在下降失敗後嘗試以節省@constituent和company_id或entrepreneur_id爲nil。我該如何解決它？

Answer 1

發生這種情況是因爲在您提交表單後，不再有params[:company_id] = 9。在render :new完成後，您將有params[:constituent][:company_id] = 9。

因此，要解決這個問題，你需要發送的不是這個get請求新的制憲：

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

但是這樣的事情：

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

您的觀點將成爲多一點點難看，爲避免錯誤，如果params[:constituent]不存在：

- 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]