ActiveAdmin :: Devise :: Sessions＃new中的Formtastic :: UnknownInputError

问题描述

使用Rails 5.0.0.beta1。

Using Rails 5.0.0.beta1.

已安装Active Admin和Devise。以下是Gemfile的内容：

Installed Active Admin and Devise. Here is Gemfile contents:

# Backend
gem 'activeadmin', '~> 1.0.0.pre2'

# Authentication
# Master branch is added for Rails 5 support
# https://github.com/plataformatec/devise/pull/3714
gem "devise", :github => 'plataformatec/devise', :branch => 'master'

按照说明安装。

rails g active_admin:install User
rake db:migrate
rake db:seed
rails server

当我尝试输入 / admin 时，出现以下错误：

When I'm trying to enter /admin, the following error appears:

无法找到输入类Input

Unable to find input class Input

提取的源（在＃332行附近）：
提高Formtastic :: UnknownInputError，无法找到输入＃{$ !. message}

Extracted source (around line #332): raise Formtastic::UnknownInputError, "Unable to find input #{$!.message}"

如果我们查看 activeadmin-1.0.0.pre2 / app / views /active_admin/devise/sessions/new.html.erb （第10行），没有特别说明al在这里：

If we look at activeadmin-1.0.0.pre2/app/views/active_admin/devise/sessions/new.html.erb (line #10), nothing special is here:

f.input :password, label: t('active_admin.devise.password.title')

怎么了？也许Formtastic类由于某种原因未自动加载？我试图将Formtastic更新到最新版本，但仍然存在错误。

What's wrong? Maybe Formtastic classes are not autoloaded for some reason? I tried to update Formtastic to the latest version, but error still remains.

我知道使用Beta冒险，但我想尝试一下。

I understand that using beta is kind of risky, but I want to try this out.

推荐答案

弄清楚了。以下是可用的选项：

Figured it out. Here are the available options:

1）可能是最好的选择。只需使用Rails 4.2.5，然后等待Rails 5的稳定发行并根据gem更新即可。

1) Probably the best option. Just use Rails 4.2.5 and wait for stable release of Rails 5 and according gem updates.

2）创建文件 app / active_admin / inputs / input.rb ，其中包含以下内容：

2) Create the file app/active_admin/inputs/input.rb with the following contents:

module ActiveAdmin
  module Inputs
    class Input < ::Formtastic::Inputs::StringInput
    end
  end
end

相关信息可用。

它解决了访问登录页面错误，您现在可以成功登录并查看仪表板。但是，例如，如果尝试输入用户部分，则会出现另一个错误：

It solves accessing login page error, you can now successfully login and view dashboard. However, if you try to enter Users section for example, you get another error:

这是因为在Rails 5中 ActionController :: Parameters 更长的扩展了 ActiveSupport :: HashWithIndifferentAccess ，其中包括 Enumerable （其中包含方法）。
，但我认为这不是您会遇到的唯一错误。

This is because ActionController::Parameters in Rails 5 no longer extends ActiveSupport::HashWithIndifferentAccess which includes Enumerable (which contains method flat_map).But I think this is not the only one error you will struggle with.

3）此错误， 2）和其他一些错误已在rails-5-spec 分支上得到修复/ activeadmin / pull / 4254 rel = nofollow>此拉取请求，所以我改在Gemfile中使用它：

3) This error, error mentioned in 2) and some other errors were fixed already on rails-5-spec branch in this pull request, so I switched to using it instead in Gemfile:

gem 'activeadmin', :github => 'activeadmin/activeadmin', :branch => 'rails-5-rspec'

现在错误消失了。

更新：：我选择了第3 选项，它解决了开发服务器上的问题，但是当我将应用程序部署到生产环境时，错误再次出现。我使用了 2）中提到的修复程序，现在在生产服务器上也可以。

Update: I choose 3rd option and it solves the problem on development server, but when I deployed application to production, error appeared again. I used the fix mentioned in 2) and now it's OK on production server too.

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