Rails 4：无法通过表单更新多态嵌套资源

时间：2014-07-16 10:43:15

标签： ruby-on-rails polymorphic-associations ruby-on-rails-4.1

刚刚在共享服务器上将Rails 2中的应用程序转移到VPS上的Rails 4的最后阶段，但是只停留在一件事上。

我有一个使用Carrierwave上传和显示附加图像的Image模型。 Image模型与其他几个模型具有多态关联。主机和关联模型在组合的多部分表单上一起更新。

该表单非常适合创建和编辑主模型以及创建和附加新图像，但无法编辑图像属性，也没有任何错误可以帮助。

以下是我的图片模型的相关部分：

class Image < ActiveRecord::Base
  belongs_to :imagings, polymorphic: true, touch: true
  mount_uploader :image, ImageUploader, mount_on: :image_file_name
end

我的评论模型：

class Review < ActiveRecord::Base
  has_many :images, as: :imagings, dependent: :destroy  
  accepts_nested_attributes_for :images, reject_if: lambda { |t| t['image'].nil? }, allow_destroy: true
end

我的评论控制器：

class ReviewsController < ApplicationController
  def edit
    @review = Review.find(params[:id])
    3.times {@review.images.build}
  end

  def update
    @review = Review.find(params[:id])
    if @review.update(reviews_params)
      redirect_to @review, notice: "Successfully updated review."
    else
      render :edit
    end
  end

  private

  def reviews_params
   params.require(:review).permit(:title, :authors, :venue, :startdate, :enddate, :body, :approved, :company, :user_id, { images_attributes: [:title, :credits, :image, :_destroy, :id] })
  end
end

我可以使用此设置很好地将图像添加到现有评论或新评论中，但如果我尝试更改现有图像的文本字段，则参数会显示在控制台中，但会被忽略：

Started PATCH "/reviews/492" for 127.0.0.1 at 2014-07-16 11:03:42 +0100
Processing by ReviewsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"HvrsCAXXvO4zIqTBw05qSUwU9I2241DXyilhswEbU9o=", "review"=>{"title"=>"Here's a new review", "authors"=>"", "company"=>"", "venue"=>"", "startdate"=>"2014-07-16", "enddate"=>"2014-07-31", "body"=>"<p>Something</p>", "images_attributes"=>{"0"=>{"title"=>"Doggie", "credits"=>"Icons galore", "_destroy"=>"0", "id"=>"1239"}, "1"=>{"title"=>"", "credits"=>""}, "2"=>{"title"=>"", "credits"=>""}, "3"=>{"title"=>"", "credits"=>""}}, "user_id"=>"4", "approved"=>"1"}, "commit"=>"Update Review", "id"=>"492"}
  User Load (0.4ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = $1 LIMIT 1  [["id", 1]]
  Review Load (0.3ms)  SELECT  "reviews".* FROM "reviews"  WHERE "reviews"."id" = $1 LIMIT 1  [["id", 492]]
   (12.4ms)  BEGIN
  Image Load (0.4ms)  SELECT "images".* FROM "images"  WHERE "images"."imagings_id" = $1 AND "images"."imagings_type" = $2 AND "images"."id" IN (1239)  [["imagings_id", 492], ["imagings_type", "Review"]]
   (0.2ms)  COMMIT
Redirected to http://127.0.0.1:3000/reviews/492
Completed 302 Found in 27ms (ActiveRecord: 13.6ms)

您可以在此处看到credit的images属性如何更改为“Icons galore”，但SQL仅提取链接的图像而不更新它。将此与主模型的以下更新进行对比，主模型执行选择，然后在BEGIN和COMMIT之间进行更新。

Started PATCH "/reviews/492" for 127.0.0.1 at 2014-07-16 11:26:01 +0100
Processing by ReviewsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"HvrsCAXXvO4zIqTBw05qSUwU9I2241DXyilhswEbU9o=", "review"=>{"title"=>"Here's a new review", "authors"=>"", "company"=>"", "venue"=>"", "startdate"=>"2014-07-16", "enddate"=>"2014-07-31", "body"=>"<p>Something else</p>", "images_attributes"=>{"0"=>{"title"=>"Doggie", "credits"=>"Icons", "_destroy"=>"0", "id"=>"1239"}, "1"=>{"title"=>"", "credits"=>""}, "2"=>{"title"=>"", "credits"=>""}, "3"=>{"title"=>"", "credits"=>""}}, "user_id"=>"4", "approved"=>"1"}, "commit"=>"Update Review", "id"=>"492"}
  User Load (6.4ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = $1 LIMIT 1  [["id", 1]]
  Review Load (0.3ms)  SELECT  "reviews".* FROM "reviews"  WHERE "reviews"."id" = $1 LIMIT 1  [["id", 492]]
   (18.1ms)  BEGIN
  Image Load (0.5ms)  SELECT "images".* FROM "images"  WHERE "images"."imagings_id" = $1 AND "images"."imagings_type" = $2 AND "images"."id" IN (1239)  [["imagings_id", 492], ["imagings_type", "Review"]]
  SQL (5.9ms)  UPDATE "reviews" SET "body" = $1, "updated_at" = $2 WHERE "reviews"."id" = 492  [["body", "<p>Something else</p>"], ["updated_at", "2014-07-16 10:26:01.455481"]]
   (24.8ms)  COMMIT
Redirected to http://127.0.0.1:3000/reviews/492
Completed 302 Found in 120ms (ActiveRecord: 56.0ms)

然而，如果我尝试在Rails控制台中进行相同的更新，它有时可以完美地运行：

2.1.1 :062 > review =  Review.find(492)
  Review Load (0.5ms)  SELECT  "reviews".* FROM "reviews"  WHERE "reviews"."id" = $1 LIMIT 1  [["id", 492]]
 => #<Review id: 492, title: "Here's a new review", authors: "", venue: "", startdate: "2014-07-16", enddate: "2014-07-31", body: "<p>Something else</p>", approved: true, created_at: "2014-07-16 09:38:33", updated_at: "2014-07-16 10:26:01", user_id: 4, company: ""> 
2.1.1 :064 > review.images.first.title = "Doggies galore"
 => "Doggies galore" 
2.1.1 :066 > review.save
   (0.8ms)  BEGIN
  SQL (7.5ms)  UPDATE "images" SET "title" = $1, "updated_at" = $2 WHERE "images"."id" = 1239  [["title", "Doggies galore"], ["updated_at", "2014-07-16 10:32:39.109784"]]
  Review Load (0.3ms)  SELECT  "reviews".* FROM "reviews"  WHERE "reviews"."id" = $1 LIMIT 1  [["id", 492]]
  SQL (1.7ms)  UPDATE "reviews" SET "updated_at" = '2014-07-16 10:32:39.129314' WHERE "reviews"."id" = 492
   (1.6ms)  COMMIT
 => true

有时不会：

2.1.1 :082 > review =  Review.find(492)
  Review Load (0.3ms)  SELECT  "reviews".* FROM "reviews"  WHERE "reviews"."id" = $1 LIMIT 1  [["id", 492]]
 => #<Review id: 492, title: "Here's a new review", authors: "", venue: "", startdate: "2014-07-16", enddate: "2014-07-31", body: "<p>Something else</p>", approved: true, created_at: "2014-07-16 09:38:33", updated_at: "2014-07-16 10:38:30", user_id: 4, company: ""> 
2.1.1 :083 > review.images.first.credits = "Icons galore"
  Image Load (0.5ms)  SELECT  "images".* FROM "images"  WHERE "images"."imagings_id" = $1 AND "images"."imagings_type" = $2  ORDER BY "images"."id" ASC LIMIT 1  [["imagings_id", 492], ["imagings_type", "Review"]]
 => "Icons galore" 
2.1.1 :084 > review.save!
   (0.2ms)  BEGIN
   (0.3ms)  COMMIT
 => true 
2.1.1 :085 > review.images.first
  Image Load (0.8ms)  SELECT  "images".* FROM "images"  WHERE "images"."imagings_id" = $1 AND "images"."imagings_type" = $2  ORDER BY "images"."id" ASC LIMIT 1  [["imagings_id", 492], ["imagings_type", "Review"]]
 => #<Image id: 1239, title: "Doggies", credits: "Icons", created_at: "2014-07-16 09:38:33", updated_at: "2014-07-16 10:38:30", image_file_name: "ddad7b05-3430-49ed-b129-fd484ac793ad.gif", image_content_type: nil, image_file_size: nil, image_updated_at: nil, imagings_id: 492, imagings_type: "Review", original_filename: "Doggie.gif"> 
2.1.1 :086 >

我知道我错过了一些明显的东西。有人可以帮忙吗？

2 个答案:

答案 0 :(得分：0)

我认为你需要在reviews_params def中做一个小改动，如下所示：

def reviews_params
   params.require(:review).permit(:title, :authors, :venue, :startdate, :enddate, :body, :approved, :company, :user_id, images_attributes => [:title, :credits, :image, :_destroy, :id] )
end

这有用吗？

答案 1 :(得分：0)

我认为您不需要花括号。尝试删除它们。通常，嵌套属性以符号形式列出，该符号映射到符号（属性）数组。它们与所讨论的模型的属性仅用逗号分开。这样的事情， params.require(:review).permit(:title, :authors, :venue, :startdate, :enddate, :body, :approved, :company, :user_id, :images_attributes => [:title, :credits, :image, :_destroy, :id] ) should work.

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