回形针不会将图像插入数据库(Rails 4 + 回形针 4.2.1)

Question

当我尝试通过回形针将图像上传到数据库时，它总是忽略图像列。我不确定为什么它不起作用，我对回形针进行了大量研究，例如 github、YouTube，并且与那些教程完全相同。我想我做了所有代码的正确，但我不知道问题来自哪里，请指出这一点。

控制台信息

Started POST "/categories" for 127.0.0.1 at 2015-04-13 17:07:49 +1000
Processing by CategoriesController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"DIR1d3lWrcwcylkelLsRm/262BRZqu5w3cmrMP/5LV0=", "category"=>{"name"=>"Food", "parent_category_id"=>"", "description"=>""}, "commit"=>"Create Category"}
(0.1ms)  begin transaction
SQL (0.4ms)  INSERT INTO "categories" ("created_at", "description", "name", "updated_at") VALUES (?, ?, ?, ?)  [["created_at", "2015-04-13 07:07:49.850360"], ["description", ""], ["name", "Food"], ["updated_at", "2015-04-13 07:07:49.850360"]]
(9.3ms)  commit transaction
Redirected to http://localhost:3000/categories/1
Completed 302 Found in 15ms (ActiveRecord: 9.7ms)

宝石文件

source 'https://rubygems.org'

gem 'rails', '4.1.6'
gem 'sqlite3'
gem 'sass-rails', '~> 4.0.3'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.0.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0',          group: :doc
gem 'spring',        group: :development
gem 'paperclip', '~> 4.2.1'
gem 'bootstrap-sass'
gem 'jquery_mobile_rails'

模型类

class Category < ActiveRecord::Base
  has_attached_file :photo, :styles => {:medium => "300x300", :thumb => "100x100"}
  validates_attachment_content_type :photo, :content_type => /Aimage/.*Z/
  has_many :children, class_name: "Category", foreign_key: "parent_category_id"
  belongs_to :parent, class_name: "Category", foreign_key: "parent_category_id"
  #has_many :products
end

我在控制器中添加列

def category_params
      params.require(:category).permit(:name, :parent_category_id, :description, :photo)
end

像这样更改了 _form.html.erb 文件

<%= form_for @category, :url => categories_path, :html => {:multipart => true} do |f| %>
    ...
<div class="field">
   <%= f.label :photo %><br>
   <%= f.file_field :photo %>
</div>
    ...

schema.rb 文件现在如下所示：

create_table "categories", force: true do |t|
    t.string   "name"
    t.integer  "parent_category_id"
    t.text     "description"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.string   "photo_file_name"
    t.string   "photo_content_type"
    t.integer  "photo_file_size"
    t.datetime "photo_updated_at"
end

Answer 1

问题从这里解决，希望这能帮助某人解决同样的问题

我认为问题是由使用 gem 引起的jquery_mobile_rails我需要像这样更改 _form.html.erb 文件（添加"data-ajax"=> false）

= form_for(@category, :html => { :multipart => true, "data-ajax" => false}) do |f|