使用 Rails 显示数据库中的图像 [英] Showing images with Rails from database

问题描述

我正在尝试将我存储"在数据库中的特定类型的图像显示到视图上.我有一个产品"模型和一个图像"模型，因为每个产品都有几种类型的图像(例如图库"、特色"、拆箱图像"，它们被简单地存储为类型 0 的属性, 1 或 2)

I'm trying to show a specific type of image that I've "stored" in the database onto the view. I have a model for "products" and a model for "images" as I have several types of images for each product (such as "gallery", "featured", "unboxing image" which are simplely stored as an attribute of type 0, 1 or 2)

我已将其放入 HTML 中:

I've put this into the HTML:

<%= image_tag @product.images.where(image_type: 2).first, :alt => 'product_image' %>

当我点击检查元素时，我看到:

When I click to inspect element, I see this:

<img alt="product_image" src="/images/#<Image:0x007fcba329f4c0>">

有人可以解释一下为什么会发生这种情况吗?看起来它正在我的资产/图像文件夹中搜索图像，但那是什么 #<和这样的在那里?我的图像在数据库中存储为像 lamp.png 一样.

Can someone please explain why what is happening? It looks like it is searching for the image in my assets/images folder but what is that #< and such in there? My image is stored as like lamp.png in the database.

这是我的图像模型:

class Image < ActiveRecord::Base

  include AASM

  belongs_to :product
  mount_uploader :file, FileUploader

  validates :image_type, presence: true


  enum image_type: [IMAGE_UNBOXING.to_s, IMAGE_GALLERY.to_s, IMAGE_FEATURED.to_s]

  aasm column: :image_type do
    Image.image_types.keys.each do |state_string|
      state state_string.to_sym
    end

  end

end

谢谢.

推荐答案

@product.images.where(image_type: 2).first 从数据库返回第一条记录，但对于 image_tag 你应该为返回的记录指定 url 或 path.

@product.images.where(image_type: 2).first returns a first record from database, but for image_tag you should specify url or path for returned records.

使用 url 属性或您拥有的:

Use url attribut or what you have:

<%= image_tag @product.images.where(image_type: 2).first.url, :alt => 'product_image' %>
                                                         ^^^

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