Question

我正在使用CarrierWave，截至目前，该画廊向公众开放，没有所有权。我想设置一个，用户不必创建一个Gallery。唯一的选择应该是将照片上传到他们的帐户，我希望将每个用户照片上传限制为最多5个。因此，如果用户16登录，他们可以选择将最多5张照片上传到他们的个人资料中。达到该限制后，如果用户尝试上传更多内容，则应显示“已上传最多照片，删除以上传更多内容”。我不确定如何解决这个问题。

photo.rb型号：

class Photo < ActiveRecord::Base
  attr_accessible :title, :body, :gallery_id, :name, :image, :remote_image_url
  has_many :user, :through => :gallery
  has_many :gallery
  mount_uploader :image, ImageUploader

    LIMIT = 5

    validate do |record|
      record.validate_photo_quota
    end

    def validate_photo_quota
      return unless self.user
      if self.gallery.user(:reload).count >= LIMIT
        errors.add(:base, :exceeded_quota)
      end
    end
end

照片控制器：

class PhotosController＆lt; ApplicationController中

  def new
    @photo = Photo.new(:gallery_id => params[:gallery_id])
  end

  def create
    @photo = Photo.new(params[:photo])
    if @photo.save
      flash[:notice] = "Successfully created photos."
      redirect_to @photo.gallery
    else
      render :action => 'new'
    end
end

  def edit
    @photo = Photo.find(params[:id])
  end

  def update
    @photo = Photo.find(params[:id])
    if @photo.update_attributes(paramas[:photo])
      flash[:notice] = "Successfully updated photo."
      redirect_to @photo.gallery
    else
      render :action => 'edit'
    end
  end

  def destroy
    @photo = Photo.find(params[:id])
    @photo.destroy
    flash[:notice] = "Successfully destroyed photo."
    redirect_to @photo.gallery
  end
end

画廊控制器：

class GalleriesController < ApplicationController
  def index
    @galleries = Gallery.all
  end

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

  def new
    @gallery = Gallery.new
  end

  def create
    @gallery = Gallery.new(params[:gallery])
    if @gallery.save
      flash[:notice] = "Successfully created gallery."
      redirect_to @gallery
    else
      render :action => 'new'
    end
  end

  def edit
    @gallery = Gallery.find(params[:id])
  end

  def update
    @gallery = Gallery.find(params[:id])
    if @gallery.update_attributes(params[:gallery])
      flash[:notice] = "Successfully updated gallery."
      redirect_to gallery_url
    else
      render :action => 'edit'
    end
  end

  def destroy
    @gallery = Gallery.find(params[:id])
    @gallery.destroy
    flash[:notice] = "Successfully destroy gallery."
    redirect_to galleries_url
  end
end

Answer 1

限制用户访问

要限制用户访问某些模型，我会使用类似CanCan的内容。

它会让你做这样的事情：

## ability.rb
# Allow user to CRUD pictures belonging to own gallery
can :manage, Picture, gallery: {user: user}

在控制器中，您可以执行以下操作：

# picture_controller.rb
# assuming a nested route, e.g. galleries/1/pictures
load_and_authorize_resource :gallery
load_and_authorize_resource :picture, through: :gallery

这将确保每个用户只能看到他或她自己的照片。

限制图库中的图片数量

我认为你的验证方法还可以。

我会简化它：

validate :quota

private

def quota
  return unless user
  if gallery.pictures.count > 4
    errors[:base] << "Maximum photos uploaded, delete to upload more"
  end 
end

错误消息可能应该进入区域设置文件。

自动为每个用户创建图库

要执行此操作，请确保Gallery模型与User具有belong_to关联。然后在User模型的回调中创建库：

# models/user.rb
after_create :setup_gallery

private
def setup_gallery
  Gallery.create(user: self)
end

一般说明

定义has_many关系时，应使用复数名称，例如has_many :users或has_many :galleries。

自定义库，以便它属于一个用户

1 个答案: