Rails：回形针不将图像保存到数据库

Posted 2023-02-25

【中文标题】Rails：回形针不将图像保存到数据库

【英文标题】：Rails: Paperclip Not Saving Image to DB

【发布时间】：2017-07-23 05:03:23

【问题描述】：

我在我的 rails 应用程序上有一个相当简单的回形针设置。

我的products_controller.rb 是这个：

class ProductsController < ApplicationController
  ...

  def new
    @product = Product.new
  end

  def create
    @product = Product.new(product_params)
    @product.save
    flash[:notice] = "Your product has been created!"
    redirect_to products_path
  end

  def edit
    @product = Product.find(params[:id])
  end

  def update
    @product = Product.find(params[:id])
    if @product.update_attributes(product_params)
      redirect_to products_path
      flash[:notice] = "That product has been updated."
    else
      render :action => :edit
      flash[:alert] = "Something went terribly wrong there..."
    end
  end

  ...

  private

  def product_params
    params.require(:product).permit(:name, :price, :active, :short_description, :weight, :box_length, :box_width, :box_depth, :product_image)
  end
end

我的products#edit 表单（products#new 也不起作用，但它是相同的表单）：

<%= form_for @product, html:  multipart: true  do |f| %>

  <div class="form-inputs row">
    <div class="form-group col-xs-9">
      <%= f.label "Product Name" %>
      <%= f.text_field :name, class: "form-control" %>
    </div> <!-- form group -->

    <div class="form-group col-xs-3">
      <%= f.label :price %>
      <%= f.text_field :price, class: "form-control", data: autonumeric: true %>
    </div> <!-- form group -->

    <div class="form-group col-xs-12">
      <%= f.label "Product Description" %>
      <%= f.text_area :short_description, class: "form-control" %>
    </div> <!-- form group -->

    <div class="form-group col-xs-12">
      <%= f.file_field :image, as: :file %>
    </div> <!-- form group -->

    <div class="form-group text-center col-xs-12">
       <p><%= f.check_box :active %> This is an active product.</p>
    </div> <!-- form group -->

    <div class="row">
      <hr class="col-xs-6 col-xs-push-3" />
    </div>

    <div class="col-xs-12">
      <h2 class="text-center">Shipping Information</h2>
    </div>

    <div class="form-group col-xs-6">
      <%= f.label "Product Length (in Inches)" %>
      <%= f.text_field :box_length, class: "form-control" %>
    </div> <!-- form group -->

    <div class="form-group col-xs-6">
      <%= f.label "Product Width (in Inches)" %>
      <%= f.text_field :box_width, class: "form-control" %>
    </div> <!-- form group -->

    <div class="form-group col-xs-6">
      <%= f.label "Product Depth (in Inches)" %>
      <%= f.text_field :box_depth, class: "form-control" %>
    </div> <!-- form group -->

    <div class="form-group col-xs-6">
      <%= f.label "Product Weight (in Pounds)" %>
      <%= f.text_field :weight, class: "form-control" %>
    </div> <!-- form group -->
  </div>

  <div class="form-actions text-center">
    <%= f.button :submit, class: "btn btn-manly" %>
  </div>
<% end %>

还有我的相关路线：

资源：产品

最后是product.rb 模型：

class Product < ActiveRecord::Base
  has_many :order_items
  has_attached_file :product_image
  validates_attachment_content_type :product_image, content_type: /\Aimage\/.*\z/
  validates_attachment_file_name :product_image, matches: [/png\z/, /jpe?g\z/]

  default_scope  where(active: true) 
end

还有产品表的schema.rb：

create_table "products", force: :cascade do |t|
    t.string   "name"
    t.decimal  "price",                      precision: 12, scale: 3
    t.boolean  "active"
    t.datetime "created_at",                                          null: false
    t.datetime "updated_at",                                          null: false
    t.string   "short_description"
    t.decimal  "weight"
    t.decimal  "box_length"
    t.decimal  "box_width"
    t.string   "box_depth"
    t.string   "product_image_file_name"
    t.string   "product_image_content_type"
    t.integer  "product_image_file_size"
    t.datetime "product_image_updated_at"
  end

提交时我没有收到任何错误。我还尝试了 Paperclip 文档中给出的 simple_form_for 和 form_for 变体。我已经仔细检查并安装了 ImageMagick。谁能看到它为什么不保存？当我尝试上传图片后检查控制台时，它只显示所有四个回形针字段的 nil。

【问题讨论】：

你的模型是什么样的？您是否正确设置了回形针？您是否对模型中的回形针字段进行了适当的迁移？

@PressingOnAlways，我将架构和模型添加到 OP。

【参考方案1】：

您使用:image 代替file_field，但您的回形针字段使用的是product_image，更改如下以上传文件

<div class="form-group col-xs-12">
  <%= f.file_field :product_image, as: :file %>
</div> <!-- form group -->