紅寶石軌道上 - 嵌套窗體，屬性沒有保存（用回形針上傳圖像）

Question

我跟隨harlt的教程開始與紅寶石。現在我想添加圖片到我的微博。當我使用簡單的形式來上傳圖片時，它就起作用了。當我想以我的micropost形式上傳圖片時，會創建圖像，但所有屬性均爲空。

服務器日誌圖片的簡單的上傳

Started POST "/photos" for 127.0.0.1 at 2013-11-28 17:50:33 +0100 
Processing by PhotosController#create as HTML 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"u7MWO+E9jM8/g+6RwquQ7XLA3PR+ohQFAx0tmwNOfuY=", "photo"=>{"image"=>#<ActionDispatch::Http::UploadedFile:0x007f77b93b2710 @tempfile=#<Tempfile:/tmp/RackMultipart20131128-19203-ypziwp>, @original_filename="photoiphone.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"photo[image]\"; filename=\"photoiphone.jpg\"\r\nContent-Type: image/jpeg\r\n">}, "commit"=>"Create Photo"} 
    #[1m#[36mUser Load (0.3ms)#[0m #[1mSELECT "users".* FROM "users" WHERE "users"."remember_token" = '4c0f0085d819eec94a9d0eba0175fb7642fe4976' LIMIT 1#[0m 
    #[1m#[35m (0.1ms)#[0m begin transaction 
Binary data inserted for `string` type on column `image_content_type` 
    #[1m#[36mSQL (0.6ms)#[0m #[1mINSERT INTO "photos" ("created_at", "image_content_type", "image_file_name", "image_file_size", "updated_at") VALUES (?, ?, ?, ?, ?)#[0m [["created_at", Thu, 28 Nov 2013 16:50:33 UTC +00:00], ["image_content_type", "image/jpeg"], ["image_file_name", "photoiphone.jpg"], ["image_file_size", 51874], ["updated_at", Thu, 28 Nov 2013 16:50:33 UTC +00:00]] 
    #[1m#[35m (180.2ms)#[0m commit transaction 
Redirected to http://localhost:3000/photos/15 
Completed 302 Found in 191ms (ActiveRecord: 181.2ms) 

服務器日誌圖片在微柱形式上傳

Started POST "/microposts" for 127.0.0.1 at 2013-11-28 17:49:02 +0100 
Processing by MicropostsController#create as HTML 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"u7MWO+E9jM8/g+6RwquQ7XLA3PR+ohQFAx0tmwNOfuY=", "micropost"=>{"content"=>"test pour log", "photo_attributes"=>{"image"=>#<ActionDispatch::Http::UploadedFile:0x007f77b8871248 @tempfile=#<Tempfile:/tmp/RackMultipart20131128-19203-199w522>, @original_filename="paint.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"micropost[photo_attributes][image]\"; filename=\"paint.jpg\"\r\nContent-Type: image/jpeg\r\n">}}, "commit"=>"Post"} 
    #[1m#[36mUser Load (0.2ms)#[0m #[1mSELECT "users".* FROM "users" WHERE "users"."remember_token" = '4c0f0085d819eec94a9d0eba0175fb7642fe4976' LIMIT 1#[0m 
    #[1m#[35m (0.1ms)#[0m begin transaction 
    #[1m#[36mSQL (0.9ms)#[0m #[1mINSERT INTO "microposts" ("content", "created_at", "updated_at", "user_id") VALUES (?, ?, ?, ?)#[0m [["content", "test pour log"], ["created_at", Thu, 28 Nov 2013 16:49:02 UTC +00:00], ["updated_at", Thu, 28 Nov 2013 16:49:02 UTC +00:00], ["user_id", 101]] 
    #[1m#[35mSQL (0.3ms)#[0m INSERT INTO "photos" ("created_at", "micropost_id", "updated_at") VALUES (?, ?, ?) [["created_at", Thu, 28 Nov 2013 16:49:02 UTC +00:00], ["micropost_id", 21], ["updated_at", Thu, 28 Nov 2013 16:49:02 UTC +00:00]] 
    #[1m#[36m (147.9ms)#[0m #[1mcommit transaction#[0m 
Redirected to http://localhost:3000/ 
Completed 302 Found in 161ms (ActiveRecord: 149.3ms) 

我們可以看到該行Binary data inserted for string type on column image_content_type只出現在第一個日誌中。

用戶控制器

class UsersController < ApplicationController 
    before_action :signed_in_user, only: [:index, :edit, :update] 
    before_action :correct_user, only: [:edit, :update] 

    def new 
    @user = User.new 
    end 

    def index 
    #@users = User.all 
    @users = User.paginate(page: params[:page]) 
    end 

    def show 
    @user = User.find(params[:id]) 
    @micropost = current_user.microposts.build 
    @photo = @micropost.build_photo 
    @microposts = @user.microposts.paginate(page: params[:page]) 
    @feed_items = current_user.feed.paginate(page: params[:page]) 
    end 

    def create 
    @user = User.new(user_params) 
    if @user.save 
     sign_in @user 
     flash[:success] = "Welcome to the PYL!" 
     redirect_to @user 
    else 
     render 'new' 
    end 
    end 

    def edit 
    @user = User.find(params[:id]) 
    end 

    def update 
    if @user.update_attributes(user_params) 
     flash[:success] = "Profile updated" 
     redirect_to @user 
    else 
     render 'edit' 
    end 
    end 


    private 

    def user_params 
     params.require(:user).permit(:name, :email, :password, :password_confirmation) 
    end 

    def signed_in_user 
     store_location 
     redirect_to signin_url, notice: "Please sign in." unless signed_in? 
    end 

    def correct_user 
     @user = User.find(params[:id]) 
     redirect_to(root_url) unless current_user?(@user) 
    end 

end 

視圖示出了用於用戶呈現此形式

<%= form_for @micropost, :html => { :multipart => true } do |f| %> 
<%= render 'shared/error_messages', object: f.object %> 
<div class="field"> 
    <%= f.text_area :content, placeholder: "Compose new micropost..." %> 

</div> 
<%= f.fields_for :photo do |builder| %> 
<%= file_field :image, :f=>builder %> 
<% end %> 
<%= f.submit "Post", class: "btn btn-large btn-primary" %> 
<% end %> 

數據庫

create_table "microposts", force: true do |t| 
    t.string "content" 
    t.integer "user_id" 
    t.datetime "created_at" 
    t.datetime "updated_at" 
    t.integer "photo_id" 
    end 

    add_index "microposts", ["user_id", "created_at"], name: "index_microposts_on_user_id_and_created_at" 

    create_table "photos", force: true do |t| 
    t.datetime "created_at" 
    t.datetime "updated_at" 
    t.string "image_file_name" 
    t.string "image_content_type" 
    t.string "image_file_size" 
    t.string "image_update_at" 
    t.integer "micropost_id" 
    end 

對於圖片的簡單的上傳我用這個代碼：

照片控制器

class PhotosController < ApplicationController 
    before_action :signed_in_user, only: [:create, :index] 
    before_action :set_photo, only: [:show, :edit] 

    def index 
    @photos = Photo.all 
    end 

    def show 
    end 

    def new 
    @photo = Photo.new 
    end 

    def edit 
    end 

    def create 
    @photo = Photo.new(photo_params) 

    respond_to do |format| 
     if @photo.save 
     format.html { redirect_to @photo, notice: 'Photo was successfully created.' } 
     format.json { render action: 'static_pages/home', status: :created, location: @photo } 
     else 
     format.html { render action: 'static_pages/home' } 
     format.json { render json: @photo.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

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

    def photo_params 
     params.require(:photo).permit(:image) 
    end 
end 

和形式鑑於新

<%= form_for @photo, :html => { :multipart => true } do |f| %> 
<%= f.file_field :image %> 
<%= f.submit %> 
<% end %> 

我使用SQLite Manager來看看我的數據庫。 我也有一個微控制器，並不真正知道它是如何工作的，因爲它適用於沒有圖片的微博，但我認爲我需要在我的用戶控制器中使用micropost_params，但我無法訪問它。

class MicropostsController < ApplicationController 
    before_action :signed_in_user, only: [:create, :destroy] 
    before_action :correct_user, only: :destroy 



    def create 
    @micropost = current_user.microposts.build(micropost_params) 
    @photo = @micropost.build_photo 
    if @micropost.save 
     flash[:success] = "Micropost created!" 
     redirect_to root_url 
    else 
     @feed_items = [] 
     render 'static_pages/home' 
    end 
    end 

    def destroy 
    @micropost.destroy 
    redirect_to root_url 
    end 

    private 

    def micropost_params 
    params.require(:micropost).permit(:content, photo_attributes: [image: 
       [:image_file_name, :image_content_type, :image_file_size, :image_update_at]]) 
    end 

    def correct_user 
    @micropost = current_user.microposts.find_by(id: params[:id]) 
    redirect_to root_url if @micropost.nil? 
    end 

末

感謝您的幫助:)！

Answer 1

如果您調用builder.file_field：image而不是file_field：image，：f =>：builder？會怎麼樣？