ruby-on-rails - Controller 中的NoMethodError

你好，我是Ruby的新手，我正在尝试在我的项目控制器中创建一个方法，如下所示：

def update_phase
    @project = Project.find(params[:id])
    diff = (Date.current.year * 12 + Date.current.month) - (@project.starting.year * 12 + @project.starting.month)
    case
        when diff >= 30
            @project.process = 11
            .
            .
            .
        when diff >= 0
            @project.process = 1
        else
            @project.process = 0
    end
    proc = @project.process.to_f
    case
        when proc >= 9
            @project.phase = "Final"
        when proc >= 5
            @project.phase = "Desarrollo"
        when proc >= 1
            @project.phase = "Inicio"
        else
            @project.phase = "Error en el proceso"
    end
end

starting是模型中的时间戳在我看来，我有：
<% @project.update_phase %>
但我得到了错误："NoMethodError in Projects#show"
我该怎么解决？

最佳答案

根据starting来自何处或来自何处，您可以使用before_save回调，这样每当您要创建新记录时，它都会触发update_phase方法并从当前项目对象为process和phase分配值：

class Project < ApplicationRecord
  before_save :update_phase

  ...

  def update_phase
    diff = (Date.current.year * 12 + Date.current.month) - (self.starting.year * 12 + self.starting.month)
    case
      when diff >= 30
        self.process = 11
        ...
    end
    proc = self.process.to_f
    case
      when proc >= 9
        self.phase = 'Final'
        ...
    end
  end
end

关于ruby-on-rails - Controller 中的NoMethodError，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45114316/