NoMethodError在控制器

Question

你好，我是在新的Ruby和我試圖使一個方法在我的項目控制，像這樣：

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是在模型中的時間戳。在我看來，我有： <% @project.update_phase %> 但我得到的錯誤："NoMethodError in Projects#show" 我該如何解決這個問題？

Answer 1

根據什麼或來自哪裏starting，你可以使用一個before_save回調，這樣每次你要創建一個新的記錄，它觸發update_phase方法，並從當前分配的process和phase值項目對象：

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