从 _form 或控制器保存的当前用户 ID

Question

我正在使用 Devise 来管理用户，我的目标是让当前用户与创建的记录一起保存。

我试图将当前用户保存在控制器或 _form 中，但无论哪种方式都失败了！

谢谢大家的帮助。

我的记录模型

class Record < ActiveRecord::Base
  #Associations
  belongs_to :user


  # Validations
  validates :title, :user, presence: true
end

我的记录控制器

class RecordsController < ApplicationController
  before_action :find_record, only: [:show, :edit, :update, :destroy]

  def create
    @record = Record.new(record_params)

    if @record.save
      redirect_to @record
    else
      @records = Record.all
      render 'index'
    end
  end

  def update
    if @record.update(record_params)
      flash[:notice] = "The record was updated successfully"
      redirect_to @record
    else
      render 'edit'
    end
  end

  private

    def find_record
      @record = Record.find(params[:id])
    end

    def record_params
      params.require(:record).permit(:title, :description, :user_id).merge(user: current_user) # as suggested 
    end
end

我的 Rspec

require 'rails_helper'

describe RecordsController do
  let(:record) { create(:record) }
  let(:user) { create(:user) }
  let(:title) { "Some title I would like to put in my record" }
  let(:description) { "description I would like to put in my record" }


  describe "#create" do
    it "creates a new record with the given title and description" do
      expect do
        post :create, record: { title: title, description: description, user_id: user }
      end.to change { Record.count }.by(1)

      expect(response).to redirect_to(assigns[:record])

      expect(assigns[:record].title).to eq(title)
      expect(assigns[:record].description).to eq(description)
    end

    it "fails to create a record and returns to the index page" do
      expect(post :create, record: { description: description }).to render_template(:index)
      expect(assigns[:records]).to eq(Record.all)
    end
  end

  describe "#update" do
    it "find the records and sets the new given values" do
      put :update, { id: record.id, record: { title: title, description: description } }

      record.reload
      expect(record.title).to eq(title)
      expect(record.description).to eq(description)

      expect(flash[:notice]).to eq("The record was updated successfully")
    end

    it "fails to create a record and returns to the edit page" do
      expect(put :update, { id: record.id, record: { title: "" } }).to render_template(:edit)
    end
  end
end

现在保存当前用户后，Rspec 在创建和更新时抛出错误：

1) RecordsController#create creates a new record with the given title and description
     Failure/Error: post :create, record: { title: title, description: description, user_id: user }
     NoMethodError:
       undefined method `authenticate' for nil:NilClass
     # ./app/controllers/records_controller.rb:42:in `record_params'
     # ./app/controllers/records_controller.rb:9:in `create'
     # ./spec/controllers/records_controller_spec.rb:36:in `block (4 levels) in <top (required)>'
     # ./spec/controllers/records_controller_spec.rb:35:in `block (3 levels) in <top (required)>'
     # -e:1:in `<main>'

  2) RecordsController#create fails to create a record and returns to the index page
     Failure/Error: expect(post :create, record: { description: description }).to render_template(:index)
     NoMethodError:
       undefined method `authenticate' for nil:NilClass
     # ./app/controllers/records_controller.rb:42:in `record_params'
     # ./app/controllers/records_controller.rb:9:in `create'
     # ./spec/controllers/records_controller_spec.rb:46:in `block (3 levels) in <top (required)>'
     # -e:1:in `<main>'

  3) RecordsController#update find the records and sets the new given values
     Failure/Error: put :update, { id: record.id, record: { title: title, description: description } }
     NoMethodError:
       undefined method `authenticate' for nil:NilClass
     # ./app/controllers/records_controller.rb:42:in `record_params'
     # ./app/controllers/records_controller.rb:20:in `update'
     # ./spec/controllers/records_controller_spec.rb:62:in `block (3 levels) in <top (required)>'
     # -e:1:in `<main>'

  4) RecordsController#update fails to create a record and returns to the edit page
     Failure/Error: expect(put :update, { id: record.id, record: { title: "" } }).to render_template(:edit)
     NoMethodError:
       undefined method `authenticate' for nil:NilClass
     # ./app/controllers/records_controller.rb:42:in `record_params'
     # ./app/controllers/records_controller.rb:20:in `update'
     # ./spec/controllers/records_controller_spec.rb:72:in `block (3 levels) in <top (required)>'

Answer 1

要添加 tobo-oz的答案（应该有效），您还需要查看foreign keys. 试图以record_id您的record形式设置根本行不通，我认为这表明您对系统如何与这项重要技术一起工作的解释存在误解。

具体来说，您需要确保user_id在保存新的record. 这是一个关系数据库规范，而不是 Rails：

每次在 Rails 中创建关联时，都必须在数据库中设置外键以启用ActiveRecord（Rails 中的对象关联构建器）将适当的数据组合在一起：

#app/models/user.rb
class User < ActiveRecord::Base
   has_many :records
end

#app/models/record.rb
class Record < ActiveRecord:Base
   #see diagram above -- this has to have user_id in the schema :)
   belongs_to :user
end

——

您遇到的问题是您在user创建记录时没有设置外键。

您的记录表应该有一个user_id外键，这样当 Rails 拉出一个Record对象时，它就能找到User与之关联的人。

如前所述bo-oz，您可以通过设置来实现这一点@record.user，您也可以在参数中进行设置：

#app/controllers/records_controller.rb
class RecordsController < ApplicationController
   def create
      @record = Record.new record_params
      @record.save ..........
   end

   private

   def record_params
      params.require(:record).permit(......).merge(user: current_user)
   end
end

这两个答案都会在新Record对象中设置适当的外键。