Rails回形针图像URL上传 - 不保存图像

Question

Still pretty new to rails. I have a book reviews app, with image uploading via paperclip. It works fine if you upload an image through the file field, but I want to add the ability to upload images via a link. So far, I have failed hard, so I'm turning to you guys. Both rails and paperclip are the latest versions.

When I submit the form, this is what shows in the console:

Started POST "/books" for ::1 at 2015-12-24 20:49:55 -0600
Processing by BooksController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"UGX2ed+eVP9nuLoUEo/pDNX6CpICbOZgIv6U3OPcxmbRtmmIesRNki1Zv/7rQcOlqQEpsAuZVx9NjCe9mdizcQ==", "category_id"=>"", "book_url"=>"http://ecx.images-amazon.com/images/I/41aQPTCmeVL.jpg", "book"=>{"title"=>"The Hobbit", "description"=>"A wonderful journey", "author"=>"J.R.R Tolkien"}, "commit"=>"Create Book"}
  User Load (0.9ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ?  ORDER BY "users"."id" ASC LIMIT 1  [["id", 1]]
   (0.4ms)  begin transaction
  SQL (0.9ms)  INSERT INTO "books" ("title", "description", "author", "user_id", "created_at", "updated_at") VALUES (?, ?, ?, ?, ?, ?)  [["title", "The Hobbit"], ["description", "A wonderful journey"], ["author", "J.R.R Tolkien"], ["user_id", 1], ["created_at", "2015-12-25 02:49:55.555658"], ["updated_at", "2015-12-25 02:49:55.555658"]]
   (1.4ms)  commit transaction
Redirected to http://localhost:3000/
Completed 302 Found in 50ms (ActiveRecord: 3.6ms)

It seems that it is acknowledging the image url, but not saving it. It appears as a missing.png instead.

In the console if I check Book.last, it shows the image_url is nil:

SELECT  "books".* FROM "books"  ORDER BY "books"."id" DESC LIMIT 1
 => #<Book id: 25, title: "The Hobbit", description: "kJSdfkjsdkfjsjf", author: "J.R.R Tolkien", created_at: "2015-12-25 02:37:10", updated_at: "2015-12-25 02:37:10", user_id: 1, category_id: 1, book_img_file_name: nil, book_img_content_type: nil, book_img_file_size: nil, book_img_updated_at: nil, image_remote_url: nil, image_url_file_name: nil, image_url_content_type: nil, image_url_file_size: nil, image_url_updated_at: nil> 

So clearly I have something setup wrong. I have followed all the links on here I could find, and tried to combine them with how I got it working originally.

Here's my Book model:

class Book < ActiveRecord::Base
  belongs_to :user
  belongs_to :category
  has_many :reviews
  attr_reader :image_url

  has_attached_file :book_img, :styles => { :book_index => "250x350>", :book_show => "325x475>" }
  has_attached_file :image_url, :styles => { :book_index => "250x350>", :book_show => "325x475>" }, :url => "/:class/:attachment/:id/:style_:basename.:extension"
  validates_attachment_content_type :book_img, :content_type => /\Aimage\/.*\Z/

  def image_url=(url_value)
    self.image = URI.parse(url_value)

    @image_url = url_value
  end
end

Here are the book params from the books controller:

def book_params
      params.require(:book).permit(:title, :description, :author, :category_id, :book_img, :image_url)
end

Here's the migration from book_img that actually works, followed by the migration for image_url that does not.

class AddAttachmentBookImgToBooks < ActiveRecord::Migration
  def self.up
    change_table :books do |t|
      t.attachment :book_img
    end
  end

  def self.down
    remove_attachment :books, :book_img
  end
end

class AddAttachmentImageUrlToBooks < ActiveRecord::Migration
  def self.up
    change_table :books do |t|
      t.attachment :image_url
    end
  end

  def self.down
    remove_attachment :books, :image_url
  end
end

Here's the form partial

<%= simple_form_for @book, :html => { :multipart => true } do |f| %>
  <% if @book.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@book.errors.count, "error") %> prohibited this user from being saved:</h2>

      <ul>
        <% @book.errors.full_messages.each do |msg| %>
          <li><%= msg %></li>
        <% end %>
      </ul>
    </div>
  <% end %>

  <%= select_tag(:category_id, options_for_select(@categories), :prompt => "Select a Category") %>
  <%= f.file_field :book_img %>
  <%= text_field_tag 'image_url' %>
  <%= f.input :title, label: "Book Title" %>
  <%= f.input :description %>
  <%= f.input :author %>
  <%= f.button :submit, :class => 'btn-custom2' %>
<% end %>

And the relevant portion of the Schema.rb file

create_table "books", force: :cascade do |t|
    t.string   "title"
    t.text     "description"
    t.string   "author"
    t.datetime "created_at",             null: false
    t.datetime "updated_at",             null: false
    t.integer  "user_id"
    t.integer  "category_id"
    t.string   "book_img_file_name"
    t.string   "book_img_content_type"
    t.integer  "book_img_file_size"
    t.datetime "book_img_updated_at"
    t.string   "image_remote_url"
    t.string   "image_url_file_name"
    t.string   "image_url_content_type"
    t.integer  "image_url_file_size"
    t.datetime "image_url_updated_at"
end

I'm sure I'm probably missing something so simple. It just gets extra confusing when I've opened what seems to be every link related to this issue and don't know what else to try. Any help would be so greatly appreciated!

Let me know if there are any details I forgot to include. Thanks

Answer 1

replace
<%= text_field_tag 'image_url' %>
with
<%= f.input 'image_url' %>

Answer 2

在你改变book_url形成以book_img或图片网址 （ - ：