RoR - 外键设置为零后记录无法保存

Question

问题：

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LocationsController request to edit should load the requested location\nFailure/Error: @location.image = @image\n     ActiveRecord::RecordNotSaved:\n       Failed to remove the existing associated image. \nThe record failed to save when after its foreign key was set to nil.\n\nLocationsController request to edit should be successfull\nFailure/Error: @location.image = @image\n     ActiveRecord::RecordNotSaved:\n       Failed to remove the existing associated image. \nThe record failed to save when after its foreign key was set to nil.\n

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控制器部分：

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def new\n @location = Location.new\nend\n\ndef create\n  @location = Location.new(params[:location])\n  @location.owner_id = current_user.id\n  @address = Address.new(params[:address])\n  @location.image = Image.new(params[:image])\n  responds_to_parent do\n    if @location.save && @location.image.update_from_uploaded_data(params[:image])\n      @address.addressable = @location\n      @address.save\n      @locations = Location.all_as_select_options\n      respond_to do |format|\n        format.js { render layout: false }\n      end\n    else\n      render :update\n    end\n  end\nend\n\ndef edit\n  @address = @location.address\nend\n\ndef update\n  @location.image ||= Image.new\n  @location.address ||= Address.new\n  address = params[:address]\n\n  if @location.update_attributes(params[:location]) &&   @location.address.update_attributes(address) && @location.image.update_from_uploaded_data(params[:image])\n    flash[:notice] = \'Daten f\xc3\xbcr den Ort wurden ge\xc3\xa4ndert.\'\n    redirect_to location_path(@location)\n  else\n    flash[:notice] = \'Die Daten konnten nicht gespeichert werden\'\n    render action: \'edit\'\n  end\nend\n\ndef destroy\n  @location.destroy if @location.owner.id == current_user.id\n  redirect_to action: \'index\', controller: \'locations\'\nend\n\nprivate\n\ndef load_location\n  @location = Location.find(params[:id])\nend\n

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规格：

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describe \'request to edit\' do\n      before do\n        login(mock_admin)\n        @location = create_location\n        @image = create_image\n        Location.stub!(:find).and_return(@location)\n        Image.stub!(:find).and_return(@image)\n        @location.image = @image\n        get :edit, id: @location.id\n      end\n      it \'should be successfull\' do\n        response.should be_success\n      end\n      it \'should load the requested location\' do\n        assigns(:location).should eql(@location)\n      end\n      it \'should load the locations address\' do\n        assigns(:address).should eql(@location.address)\n      end\n    end\n

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我的尝试：在我的编辑方法中允许使用位置和图像等参数。就像Can't update mynested model form for has_one Association 中所建议的那样

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我尝试过

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\'params.require(:...).permit(...)\'\n

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和

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accepts_nested_attributes_for(:..., update_only: true)\n

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建议的解决方案。但即使所有参数都允许，它也没有成功。你知道为什么吗？我尝试修改方法，但是好吧......

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编辑 -- -- 型号：

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class Location < ApplicationRecord\n  belongs_to  :owner, class_name: \'::User\', foreign_key: \'owner_id\'\n  has_one     :address, as: :addressable, :dependent => :destroy\n  has_one     :image, as: :visualisable\n  has_many    :events\n\n  validates_presence_of :owner_id, :name\n\n  def display_name\n    [name.to_s, address&.display].compact.join(\', \')\n  end\n\n  def self.all_as_select_options\n    all.collect { |m| [m.name, m.id] }\n  end\n\n  def can_be_deleted_by?(user)\n    owner == user && events.count == 0\n  end\nend\n

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Answer 1

您是否正在尝试删除该图像？因为Failed to remove the existing associated image.这么说。

如果是这样，请尝试添加accepts_nested_attributes_for(:..., allow_destroy: true)到您的Location模型中。