Question

我有点不确定如何问这个，所以我为笨重的解释道歉。

我有三个模型，User，Waterusage和Goals

class Goal < ApplicationRecord
     belongs_to :user
end

class Waterusage < ApplicationRecord
     belongs_to :user
end

class User < ApplicationRecord
      # Include default devise modules. Others available are:
      # :confirmable, :lockable, :timeoutable and :omniauthable,
      has_one :waterusage, :dependent => :destroy
      has_one :goals, :dependent => :destroy
end

Waterusage首先由用户填写，然后是目标。目标是与waterusage完全相同的模式，但使用一部分waterusage形式并从waterusage复制其余属性。

class Goal < ApplicationRecord
   belongs_to :user



# before_validation :get_from_waterusage
  before_validation :calculate_totals

  def get_from_waterusage
    self.household_size = @waterusage.household_size
    self.swimming_pool = @waterusage.swimming_pool
    self.bathroom_sink_flow_rate = @waterusage.bathroom_sink_flow_rate
    self.low_flow_toilet = @waterusage.low_flow_toilet
    self.kitchen_sink_usage = @waterusage.kitchen_sink_usage
    self.kitchen_sink_flow_rate = @waterusage.kitchen_sink_flow_rate
    self.dishwasher_rate = @waterusage.dishwasher_rate
    self.dishwasher_multiplier = @waterusage.dishwasher_multiplier
    self.laundry_rate = @waterusage.laundry_rate
    self.laundry_multiplier = @waterusage.laundry_multiplier
    self.lawn_size = @waterusage.lawn_size
    self.carwash_rate = @waterusage.carwash_rate
    self.carwash_multiplier = @waterusage.carwash_multiplier
    self.miles = @waterusage.miles
    self.statewater = @waterusage.statewater
    self.percent_statewater = @waterusage.percent_statewater
    self.pet_cost = @waterusage.pet_cost
     end
    ...
    end

这是GoalsController

class GoalsController＆lt; ApplicationController的 before_action：authenticate_user！

  def new
    @goal = goal.new
  end

  def create
    #@user = User.find(params[:user_id])
    @goal = current_user.create_goal(goal_params)
    redirect_to goal_result_path

  end

  def destroy
    @user = User.find(params[:user_id])
    @goal = @user.goal.find(params[:id])
    @goal.destroy
    redirect_to user_path(current_user)
  end

  def show
    @goal = goal.find(params[:id])
  end

  def results

    if current_user.goal.get_individual_total > 6000
      @temp = 6000
    else
      @temp = current_user.goal.get_individual_total
    end

    @goal = current_user.goal

  end

  private
    def goal_params
      params.require(:goal).permit(:household_size, :average_shower,
        :shower_flow_rate, :bath_rate, :bath_multiplier, 
        :bathroom_sink_usage,
        :bathroom_sink_flow_rate, :mellow, :low_flow_toilet, 
        :kitchen_sink_usage,
        :kitchen_sink_flow_rate, :dishwasher_rate, 
        :dishwasher_multiplier,
        :dishwasher_method, :laundry_rate, :laundry_multiplier, 
    :laundry_method,
        :greywater, :lawn_rate, :lawn_multiplier, :lawn_size, 
 :xeriscaping,
        :swimming_pool, :swimming_months, :carwash_rate, 
  :carwash_multiplier,
         :carwash_method, :miles, :statewater, :percent_statewater, 
 :shopping,
        :paper_recycling, :plastic_recycling, :can_recycling, 
  :textile_recycling,
        :diet, :pet_cost, :individual_total, :household_total,       
   :home_usage, :outdoor_usage,
        :individualDifference, :householdDifference, :vehicle_usage, 
 :power_usage, :indirect_source_usage,
        :individualDifference, :householdDifference)
    end

end

我目前遇到以下错误：

NameError in GoalsController#create 
undefined local variable or method `current_user' for # 
<Goal:0x007fbedde9a590>

这似乎是我使用

从waterusage模型中检索信息的方式

self.household_size = @waterusage.household_size

我可以使用加入吗？

waterusage模型适用于BTW。

由于

Answer 1

不知道这是否是最好的方式，但我会使用这样的东西：

在您的目标模型中，您可以检查其用户是否已拥有水分。如果有，则填写该用水量中的值

您可以使用after_initialize回调来执行此操作。在你的目标模型中，就像是

class Goal < ApplicationRecord
  belongs_to :user
  after_initialize :set_default_values

  def set_default_values

    waterusage = self.user.try(:waterusage)
    if waterusage

        self.attribute1 = waterusage.attribute1
        self.attribute2 = waterusage.attribute2
        self.attribute3 = waterusage.attribute3
        #and it goes on...

    end

  end

end

所以，当您执行Goal.new时，它会检查该用户的水分并初步确定目标值。因此，您不必更改控制器上的任何内容，即使您在控制台上执行此操作，也可以。猜测使用模型回调来做这件事是一种更好的做法。不知道它是否解决了你的问题，但试一试。祝你好运！

Answer 2

您的错误消息是： Section !ifdef MULTIUSER_INSTALLMODE_INSTDIR_REGISTRY_KEY & MULTIUSER_INSTALLMODE_INSTDIR_REGISTRY_VALUENAME ${If} $MultiUser.InstallMode == CurrentUser WriteRegStr HKCU "${MULTIUSER_INSTALLMODE_INSTDIR_REGISTRY_KEY}" "${MULTIUSER_INSTALLMODE_INSTDIR_REGISTRY_VALUENAME}" "$InstDir" ${Else} WriteRegStr HKLM "${MULTIUSER_INSTALLMODE_INSTDIR_REGISTRY_KEY}" "${MULTIUSER_INSTALLMODE_INSTDIR_REGISTRY_VALUENAME}" "$InstDir" ${EndIf} !else WriteRegStr HK?? Software\?? ?? "$InstDir" ; Must match key used in InstallDirRegKey !endif SectionEnd CURRENT_USER＆＃39;为＃目标：0x007fbedde9a590`

NameError in GoalsController#create undefined local variable or method对象由您正在使用的Devise gem在控制器内自动定义。在您的模型中定义不。

您的一条评论中包含您在目标模型中使用的以下代码段：current_user。这就是您的错误消息所指的内容。（请注意，您的一条评论中的这段代码与您原始帖子中的代码不一致。这使得更难以确定此处出现的问题。）

Rails：将模型属性设置为另一个模型的属性

2 个答案: