Question

我有一个Survey类和典型的CRUD方法，包括一个create方法。我想创建一个名为create_pre的第二个创建方法，它可以进行更细微的调查创建。

这是我的代码：

  def create #old create survey method
    @survey = Survey.new(survey_params)

    respond_to do |format|
      if @survey.save
        format.html { redirect_to(@survey, :notice => 'Survey was successfully created.') }
        format.xml  { render :xml => @survey, :status => :created, :location => @survey }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @survey.errors, :status => :unprocessable_entity }
      end
    end
  end

和新的：

  def create_pre #new create survey method
    @survey = Survey.new(survey_params)

    respond_to do |format|
      if @survey.save
        format.html { redirect_to(@survey, :notice => 'Survey was successfully created.') }
        format.xml  { render :xml => @survey, :status => :created, :location => @survey }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @survey.errors, :status => :unprocessable_entity }
      end
    end
  end

但是当我尝试从控制台使用新的时，我收到一个错误：

 s = Survey.create_pre name: 'Levi\'s Pre survey', intervention_id: 165242, template_id: 3
NoMethodError: undefined method `create_pre' for Survey (call 'Survey.connection' to establish a connection):Class
Did you mean?  create
    from /home/levi/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/activerecord-4.2.4/lib/active_record/dynamic_matchers.rb:26:in `method_missing'

不知道如何解决这个问题？

当我调用create时，会创建一个调查并保存在db。

中

irb(main):022:0* s = Survey.create name: 'Levi\'s Pre survey', intervention_id: 165242, template_id: 3
  SQL (5.1ms)  USE [evrrprod2012]
  SQL (4.1ms)  BEGIN TRANSACTION
  SQL (6.0ms)  EXEC sp_executesql N'INSERT INTO [surveys] ([name], [intervention_id], [template_id], [created_at], [updated_at]) OUTPUT INSERTED.[id] VALUES (@0, @1, @2, @3, @4)', N'@0 nvarchar(4000), @1 int, @2 int, @3 datetime, @4 datetime', @0 = N'Levi''s Pre survey', @1 = 165242, @2 = 3, @3 = '02-25-2016 13:09:15.37', @4 = '02-25-2016 13:09:15.37'  [["name", "Levi's Pre survey"], ["intervention_id", 165242], ["template_id", 3], ["created_at", Thu, 25 Feb 2016 18:09:15 UTC +00:00], ["updated_at", Thu, 25 Feb 2016 18:09:15 UTC +00:00]]
  SQL (2.9ms)  COMMIT TRANSACTION
=> #<Survey id: 40, template_id: 3, name: "Levi's Pre survey", created_at: "2016-02-25 18:09:15", updated_at: "2016-02-25 18:09:15", intervention_id: 165242, created_by: nil, skip_reason: nil, skipped: nil, label: nil, note: nil, parent_id: nil>

使用create_pre失败时的相同尝试。

Answer 1

Survey.create_pre正在尝试在Survey类上调用类方法，按照惯例，它将是模型，而不是您的控制器。

更新

只是解决OP的新评论和问题。

您添加的Survey.create方法与您之前在问题中显示的SurveysController#create方法无关。

您要显示的是控制器实例方法，您已在控制器中自行定义以处理传入请求。您在控制台中调用的那个Survey.create是ActiveRecord::Base类的方法，可以在Survey模型中使用，因为它继承自ActiveRecord::Base。

create中的SurveysController方法与您在控制台中调用的Survey.create方法无关，同样也与新的create_pre方法无关您已添加到SurveysController的广告无法在Survey模式上调用。

如何在Ruby on Rails控制器中创建第二个create方法？

1 个答案:

更新