在 Rails 4 中，在第二个模型的显示页面上从一个模型创建图像

Question

我花了很长时间才弄清楚这一点...我基本上是在尝试遵循 railscast 将画廊图像添加到页面，但在这种情况下，场景如下：

我有一个 Projects 模型和一个 BodyImages 模型。 bodyimages 模型使用载波上传器将图像文件附加到每个新创建的“bodyimage”。以管理员身份登录并查看项目显示页面...我的目标是允许我的管理员用户直接从这个项目显示页面中的 div 创建 BodyImage（并上传相关的载波图像）。这些 BodyImage 应显示在上传按钮所在的下方（也在此项目显示页面上）。作为两个模型这样做可能很荒谬，但我只是希望弄清楚这一点，因为我整晚都在用头撞墙。我目前在上传图片并单击“创建 bodyimage”按钮时收到此错误消息：

Routing Error
uninitialized constant BodyimagesController

*由于某种原因，它重定向到的 URL 是 localhost:3000/bodyimages（我以为我在代码中重定向到了项目页面）

非常感谢您的帮助：

ROUTES.RB

devise_for :users
resources :projects
resources :contacts, only: [:new, :create]

resources :bodyimages, only: [:new, :create]

get 'home/index'
root 'home#index'

get '*path' => redirect('/')

VIEWS/PROJECTS/SHOW.HTML.ERB（管理员将上传照片并在同一页面下方显示给任何人）

<div class="gallery_admin_add_images">
  <%= form_for Bodyimage.new do |f| %>

    <%= f.hidden_field :project_id %>
    <p>
      <%= f.file_field :image %>
    </p>
    <p><%= f.submit %></p>
<% end %>

<div class="gallery_public_view_images">
  <% for bodyimage in @project.bodyimages %>
    <div class="col-md-6">
      <%= image_tag bodyimage.image_url.to_s %>
    </div>
  <% end %>
</div>

模型/项目.RB

has_many :categorizations
  has_many :categories, through: :categorizations
  has_many :bodyimages, dependent: :destroy
end

模型/身体图像.RB

class Bodyimage < ActiveRecord::Base
  belongs_to :project

  mount_uploader :image, ImageUploader
end

CONTROLLES/PROJECTS_CONTROLLER.RB

class ProjectsController < ApplicationController
  before_action :find_project, only: [:show, :edit, :update, :destroy]
  before_action :authenticate_user!, except: [:index, :show]

  def index
    @projects = Project.order('created_at DESC').paginate(page: params[:page], :per_page => 5)
  end

  def new
    @project = Project.new
  end

  def create
    @project =  Project.new project_params

    if @project.save
      redirect_to @project, notice: "your projects were successfully updated!"
    else
      render 'new', notice: "your projects could not be updated."
    end
  end

  def show
  end

  def edit
  end

  def update
    if @project.update project_params
      redirect_to @project, notice: "your projects were successfully updated!"
    else
      render 'edit'
    end
  end

  def destroy
    @project.destroy
    redirect_to projects_path
  end

  private

    def project_params
      params.require(:project).permit(:title, :description, :link, :coverimage, :slug, :remote_coverimage_url, category_ids: [])
    end

    def find_project
      @project = Project.friendly.find(params[:id])
    end

end

CONTROLLES/BODY_IMAGES_CONTROLLER.RB

class BodyImagesController < ApplicationController
  def new
    @bodyimage = @project.bodyimages.build(project_id: current_project.id)
  end

  def create
    @project = Project.find(params[:project_id])
    @bodyimage = @project.bodyimages.build(bodyimage_params)
    if @bodyimage.save
      flash[:notice] = "Successfully added bodyimage."
      redirect_to project_path(@project)
    else
      render :action => 'new'
    end
  end

  def index
    @bodyimages = Bodyimage.all, params[:project_id]).paginate(page: params[:page]).per_page(36)
  end


  private

  def find_project
    @project = Project.find(params[:project_id])
  end

  def bodyimage_params
    params.require(:bodyimage).permit(:project_id, :image)
  end
end

最后，我认为上传器文件没有问题，但我也会将其包括在内

UPLOADERS/IMAGE_UPLOADER.RB

# encoding: utf-8

class ImageUploader < CarrierWave::Uploader::Base

  # Include RMagick or MiniMagick support:
  include CarrierWave::RMagick
  # include CarrierWave::MiniMagick

  # Choose what kind of storage to use for this uploader:
  # storage :file if development & fog if in production
  if Rails.env.production?
    storage :fog
  else
    storage :file
  end

  include CarrierWave::MimeTypes
  process :set_content_type

  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  # Provide a default URL as a default if there hasn't been a file uploaded:
  # def default_url
  #   # For Rails 3.1+ asset pipeline compatibility:
  #   # ActionController::Base.helpers.asset_path("fallback/" + [version_name, "default.png"].compact.join('_'))
  #
  #   "/images/fallback/" + [version_name, "default.png"].compact.join('_')
  # end

  # Process files as they are uploaded:
  # process :scale => [200, 300]
  #
  # def scale(width, height)
  #   # do something
  # end

  # Create different versions of your uploaded files:
  # version :thumb do
  #   process :resize_to_fit => [50, 50]
  # end
  version :thumb do
    process :resize_to_limit => [200, 200]
  end

  # Add a white list of extensions which are allowed to be uploaded.
  # For images you might use something like this:
  # def extension_white_list
  #   %w(jpg jpeg gif png)
  # end

  # Override the filename of the uploaded files:
  # Avoid using model.id or version_name here, see uploader/store.rb for details.
  # def filename
  #   "something.jpg" if original_filename
  # end

end

Answer 1

路由错误未初始化常量 BodyimagesController

您的型号名称是Bodyimage，因此控制器名称应该是Bodyimagescontroller。但是你有BodyImagesController。

将控制器文件名更改为 bodyimages_controller.rb 并将类名更改为 BodyimagesController 应该可以解决您的问题

更新

ActiveRecord::RecordNotFound in BodyimagesController#create 不能 查找具有 'id'=

的项目

错误是由于这行redirect_to project_path(@project)，这里@project 是nil 因为你没有将值传递给hidden_​​field project_id

将<%= f.hidden_field :project_id %> 更改为<%= f.hidden_field :project_id, @project.id %>