Question

我一直试图弄清楚如何通过嵌套模型将多个图像上传到一个模型一段时间，但没有运气。我有一个项目模型，对于每个项目，我想上传多个图像。我创建了一个名为Picture的模型并将其嵌套在Project模型中，并设置了回形针，一切看起来都很好，除非我上传图像并点击＆＃34;创建项目＆＃34;，图像没有显示在＆上＃34;显示＆＃34;页。没有显示错误消息。请帮忙，因为我不知道如何从这里开始。

这是我的代码：

项目表格：

<%= bootstrap_nested_form_for @project, :html => {:multipart => true}  do |f| %>

 <% f.fields_for :pictures do |builder| %>
    <% if builder.object.new_record? %>

      <p>
        <%= builder.file_field :image %>
      </p>

    <% end %>
    <%= builder.link_to_remove "Remove" %>
  <% end %>

  <p>
   <%= f.link_to_add "Add Images", :pictures %>
 </p>

 <%= f.submit %>
<% end %>

项目管理员： -

class ProjectsController < ApplicationController
  before_action :set_project, only: [:show, :edit, :update, :destroy]

  respond_to :html

  def index
    @projects = Project.all
    respond_with(@projects)
  end

  def show
    respond_with(@project)
  end

  def new
    @project = Project.new
    @project.pictures.build
    respond_with(@project)
  end


  def edit
  @project = Project.find(params[:id])
  @project.pictures.build
  end

  def create

    @project = Project.new(project_params)
    if @project.save
    flash[:notice] = "Successfully created project."
    redirect_to @project
    else
    render :action => 'new'
    end

  end

  def update
    @project.update(project_params)
    respond_with(@project)
  end

  def destroy
    @project.destroy
    respond_with(@project)
  end

  private
    def set_project
      @project = Project.find(params[:id])
    end

    def project_params
      params.require(:project).permit(:id, :title, :description, :status, :phase, :location, pictures_attributes: [:id, :image])
    end
end

项目模型： -

class Project < ActiveRecord::Base

  has_many :pictures, :dependent => :destroy
    accepts_nested_attributes_for :pictures, :reject_if => lambda { |t| t['picture'].nil? }

end

图片模型： -

class Picture < ActiveRecord::Base
 belongs_to :project
 has_one :image

 has_attached_file :image,
:path => ":rails_root/public/system/:attachment/:id/:style/:filename",
:url => "/system/:attachment/:id/:style/:filename", 
:styles => { :medium => "300x300>", :thumb => "100x100>" }

 validates_attachment_content_type :image, :content_type => ["image/jpg", "image/jpeg", "image/png", "image/gif"]

end

显示页面： -

<% @project.pictures do |picture| %>

  <%= image_tag picture.image_url %>
<% end %>

<p>
  <strong>Title:</strong>
  <%= @project.title %>
</p>

<p>
  <strong>Description:</strong>
  <%= @project.description %>
</p>

<p>
  <strong>Status:</strong>
  <%= @project.status %>
</p>

<p>
  <strong>Phase:</strong>
  <%= @project.phase %>
</p>

<p>
  <strong>Location:</strong>
  <%= @project.location %>
</p>

<%= link_to 'Edit', edit_project_path(@project) %> |
<%= link_to 'Back', projects_path %>

架构： -

ActiveRecord::Schema.define(version: 20150728092717) do

create_table "pictures", force: true do |t|
    t.datetime "created_at"
    t.datetime "updated_at"
    t.string   "image_file_name"
    t.string   "image_content_type"
    t.integer  "image_file_size"
    t.datetime "image_updated_at"
    t.integer  "project_id"
  end

  add_index "pictures", ["project_id"], name: "index_pictures_on_project_id"
create_table "projects", force: true do |t|
    t.string   "title"
    t.text     "description"
    t.string   "status"
    t.string   "phase"
    t.string   "location"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

Answer 1

您的表单和白名单使用属性名称image。

但如果他们没有picture参数，你会拒绝任何嵌套图片。

accepts_nested_attributes_for :pictures, :reject_if => lambda { |t| t['picture'].nil? }

嵌套属性参数不包含在“模型键”中，就像通常使用的rails形式。这就是他们的样子：

params = {
  project: {
    pictures_attributes: [
      {
        image: 'foo.jpg'
      }
    ]
  }
}

您可以使用模型规范非常简单地捕获这些错误：

require 'rails_helper'
RSpec.describe Project do
  it 'accepts nested pictures' do
     project = Project.new(pictures_attributes: [{ image: 'foo.jpg' }])
     expect(project.pictures.first).to to_be_a Picture
  end
end

rails paperclip - 通过嵌套模型

1 个答案: