Ruby on rails 回形针：保持在编辑状态

当用户在我的应用程序中编辑某些内容时，他们被迫通过回形针重新上传他们的图像，即使他们没有更改它。否则将导致错误，因为我验证了：image的存在。这很烦人

如果用户在编辑时不提供新图像，如何使回形针不更新其属性

照片控制器刚从Rails脚手架生成器中取出。下面提供了其余的源代码

型号/住宿。rb

class Accommodation < ActiveRecord::Base
  attr_accessible :photo
  validates_presence_of :photo
  has_one :photo
  has_many :notifications
  belongs_to :user
  accepts_nested_attributes_for :photo, :allow_destroy => true
end

class AccommodationsController < ApplicationController
  def index
    @accommodations = Accommodation.all
  end

  def show
    @accommodation = Accommodation.find(params[:id])
    rescue ActiveRecord::RecordNotFound
      flash[:error] = "Accommodation not found."
      redirect_to :home
  end

  def new
    @accommodation = current_user.accommodations.build
    @accommodation.build_photo
  end

  def create
    @accommodation = current_user.accommodations.build(params[:accommodation])
    if @accommodation.save
      flash[:notice] = "Successfully created your accommodation."
      redirect_to @accommodation
    else
      @accommodation.build_photo
      render :new
    end
  end

  def edit
    @accommodation = Accommodation.find(params[:id])
    @accommodation.build_photo
    rescue ActiveRecord::RecordNotFound
      flash[:error] = "Accommodation not found."
      redirect_to :home
  end

  def update
    @accommodation = Accommodation.find(params[:id])
    if @accommodation.update_attributes(params[:accommodation])
      flash[:notice] = "Successfully updated accommodation."
      redirect_to @accommodation
    else
      @accommodation.build_photo
      render :edit
    end
  end

  def destroy
    @accommodation = Accommodation.find(params[:id])
    @accommodation.destroy
    flash[:notice] = "Successfully destroyed accommodation."
    redirect_to :inkeep
  end

end

class Photo < ActiveRecord::Base
  attr_accessible :image, :primary
  belongs_to :accommodation
  has_attached_file :image,
    :styles => {
      :thumb=> "100x100#",
      :small  => "150x150>" }
end

班级住宿true的\u嵌套\u属性
结束

管制员/住宿\u管制员.rb

class Accommodation < ActiveRecord::Base
  attr_accessible :photo
  validates_presence_of :photo
  has_one :photo
  has_many :notifications
  belongs_to :user
  accepts_nested_attributes_for :photo, :allow_destroy => true
end

class AccommodationsController < ApplicationController
  def index
    @accommodations = Accommodation.all
  end

  def show
    @accommodation = Accommodation.find(params[:id])
    rescue ActiveRecord::RecordNotFound
      flash[:error] = "Accommodation not found."
      redirect_to :home
  end

  def new
    @accommodation = current_user.accommodations.build
    @accommodation.build_photo
  end

  def create
    @accommodation = current_user.accommodations.build(params[:accommodation])
    if @accommodation.save
      flash[:notice] = "Successfully created your accommodation."
      redirect_to @accommodation
    else
      @accommodation.build_photo
      render :new
    end
  end

  def edit
    @accommodation = Accommodation.find(params[:id])
    @accommodation.build_photo
    rescue ActiveRecord::RecordNotFound
      flash[:error] = "Accommodation not found."
      redirect_to :home
  end

  def update
    @accommodation = Accommodation.find(params[:id])
    if @accommodation.update_attributes(params[:accommodation])
      flash[:notice] = "Successfully updated accommodation."
      redirect_to @accommodation
    else
      @accommodation.build_photo
      render :edit
    end
  end

  def destroy
    @accommodation = Accommodation.find(params[:id])
    @accommodation.destroy
    flash[:notice] = "Successfully destroyed accommodation."
    redirect_to :inkeep
  end

end

class Photo < ActiveRecord::Base
  attr_accessible :image, :primary
  belongs_to :accommodation
  has_attached_file :image,
    :styles => {
      :thumb=> "100x100#",
      :small  => "150x150>" }
end

班级住宿控制器

型号/照片.rb

class Accommodation < ActiveRecord::Base
  attr_accessible :photo
  validates_presence_of :photo
  has_one :photo
  has_many :notifications
  belongs_to :user
  accepts_nested_attributes_for :photo, :allow_destroy => true
end

class AccommodationsController < ApplicationController
  def index
    @accommodations = Accommodation.all
  end

  def show
    @accommodation = Accommodation.find(params[:id])
    rescue ActiveRecord::RecordNotFound
      flash[:error] = "Accommodation not found."
      redirect_to :home
  end

  def new
    @accommodation = current_user.accommodations.build
    @accommodation.build_photo
  end

  def create
    @accommodation = current_user.accommodations.build(params[:accommodation])
    if @accommodation.save
      flash[:notice] = "Successfully created your accommodation."
      redirect_to @accommodation
    else
      @accommodation.build_photo
      render :new
    end
  end

  def edit
    @accommodation = Accommodation.find(params[:id])
    @accommodation.build_photo
    rescue ActiveRecord::RecordNotFound
      flash[:error] = "Accommodation not found."
      redirect_to :home
  end

  def update
    @accommodation = Accommodation.find(params[:id])
    if @accommodation.update_attributes(params[:accommodation])
      flash[:notice] = "Successfully updated accommodation."
      redirect_to @accommodation
    else
      @accommodation.build_photo
      render :edit
    end
  end

  def destroy
    @accommodation = Accommodation.find(params[:id])
    @accommodation.destroy
    flash[:notice] = "Successfully destroyed accommodation."
    redirect_to :inkeep
  end

end

class Photo < ActiveRecord::Base
  attr_accessible :image, :primary
  belongs_to :accommodation
  has_attached_file :image,
    :styles => {
      :thumb=> "100x100#",
      :small  => "150x150>" }
end

class-Photo{
：thumb=>“100x100#”，
：small=>“150x150>”}
结束
你不应该需要
@住宿。在
新建
操作之外的任何地方创建照片。
“…编辑我的应用程序中的某些内容…”相当模糊。你能补充一下你的编辑/更新操作的代码和你贴回形针的模型吗？我会更新我的帖子，包括代码。我的意思是编辑关联模型的记录。另一个逻辑问题：''accepts_nested_attributes_for:photo，'allow_destroy=>true'，即使需要photo，也允许销毁。