如何使用 Rspec 来测试使用 Paperclip 的模型是否正在验证上传文件的大小? [英] How can I use Rspec to test that a model using Paperclip is validating the size of an uploaded file?

问题描述

模型:

class Attachment < ActiveRecord::Base

  belongs_to :narrative

  attr_accessible :description, :user_id, :narrative_id

  has_attached_file :file

  validates_presence_of :user_id
  validates_presence_of :narrative_id
  validates_attachment :file, :presence => true,
                       :size => {:less_than => 20.megabytes}
end

不起作用的测试:

describe Attachment do
  it { should validate_presence_of :file }
  it { should validate_size_of :file } # validate_size_of does not exist
end

我想避免将 20 MB 的文件转储到 repo 中只是为了测试这个.有没有一种类似于我上面尝试过的方法可以实际工作?

I would like to avoid dumping a 20 MB file into the repo just to test this. Is there a way similar to the one I tried above that will actually work?

推荐答案

我这样做的最好方法是使用内置的 应该是 Paperclip 的匹配器.该链接上的文档非常好，但以下是您可以使用它做什么的文档的概述:

The best way I've done this is to use the built-in shoulda matchers for Paperclip. The documentation at that link is really good, but here's an overview from the docs of what you can do with it:

在 spec_helper.rb 中，您需要要求匹配器:

In spec_helper.rb, you'll need to require the matchers:

require "paperclip/matchers"

并包含模块:

Spec::Runner.configure do |config|
  config.include Paperclip::Shoulda::Matchers
end

验证附件大小的示例:

describe User do
  it { should validate_attachment_size(:avatar).
                less_than(2.megabytes) }
end

如果您有兴趣，可以在 GitHub 上找到匹配器的来源

If you're interested, the source for the matchers can be found on GitHub

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