如何在rails 5 中使用附件gem

Question

我的环境：

Ruby 2.4.1
Rails 5.1.4

我正在尝试使用这篇文章 https://atech.blog/atech/file-attachments-in-rails-tutorial 的作者所写的附件 gem。

当我运行安装包时，它会安装附件 gem，版本 1.0.2

然后，当我尝试运行 rake 命令时，我收到一条错误消息，提示它不知道如何构建任务。

rake attach:install:migrations --trace

rake aborted!
Don't know how to build task 'attach:install:migrations' (see --tasks)
/usr/local/rvm/gems/ruby-2.4.1/gems/rake-12.3.0/lib/rake/task_manager.rb:59:in `[]'
/usr/local/rvm/gems/ruby-2.4.1/gems/rake-12.3.0/lib/rake/application.rb:159:in `invoke_task'
/usr/local/rvm/gems/ruby-2.4.1/gems/rake-12.3.0/lib/rake/application.rb:116:in `block (2 levels) in top_level'
/usr/local/rvm/gems/ruby-2.4.1/gems/rake-12.3.0/lib/rake/application.rb:116:in `each'
/usr/local/rvm/gems/ruby-2.4.1/gems/rake-12.3.0/lib/rake/application.rb:116:in `block in top_level'
/usr/local/rvm/gems/ruby-2.4.1/gems/rake-12.3.0/lib/rake/application.rb:125:in `run_with_threads'
/usr/local/rvm/gems/ruby-2.4.1/gems/rake-12.3.0/lib/rake/application.rb:110:in `top_level'
/usr/local/rvm/gems/ruby-2.4.1/gems/rake-12.3.0/lib/rake/application.rb:83:in `block in run'
/usr/local/rvm/gems/ruby-2.4.1/gems/rake-12.3.0/lib/rake/application.rb:186:in `standard_exception_handling'
/usr/local/rvm/gems/ruby-2.4.1/gems/rake-12.3.0/lib/rake/application.rb:80:in `run'
/usr/local/rvm/gems/ruby-2.4.1/gems/rake-12.3.0/exe/rake:27:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.4.1/bin/rake:23:in `load'
/usr/local/rvm/gems/ruby-2.4.1/bin/rake:23:in `<main>'
/usr/local/rvm/gems/ruby-2.4.1/bin/ruby_executable_hooks:15:in `eval'
/usr/local/rvm/gems/ruby-2.4.1/bin/ruby_executable_hooks:15:in `<main>'

关于错误是什么有什么想法吗？我想知道我是否缺少使它工作所需的 gem。附加文档的 link 是 https://github.com/adamcooke/attach

Answer 1

此 repo 中没有定义 rake 任务。

在运行 bundle install 之后，您可以通过运行ning rake -P 获得 rake 任务列表（rake -T 显示带有描述的任务）。您会看到 attach:install:migrations 不存在。

为什么不尝试使用 paperclip？

如何在rails 5 中使用附件gem

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