rails_adminのエラー

Question

rails6の環境で新たにrails_Adminを作り直そうとしましたが、以下のエラーになってしまいました。

SassC::SyntaxError in RailsAdmin::Main#dashboard

検索してもなかなかヒットせず困っています。特別な設定は一切しておりません。インストールをして試してみようとしただけです。なにかわかることがあったらコメントよろしくおねがいします。

---

Started GET "/admin" for ::1 at 2019-12-29 12:19:54 +0900
   (14.5ms)  SELECT sqlite_version(*)
   (1.2ms)  SELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC
Processing by RailsAdmin::MainController#dashboard as HTML
  User Load (1.3ms)  SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ?  
[["id", 2], ["LIMIT", 1]]
  ↳ config/initializers/rails_admin.rb:7:in `block (2 levels) in <top (required)>'
Started GET "/admin" for ::1 at 2019-12-29 12:19:59 +0900
   (0.3ms)  SELECT sqlite_version(*)
Processing by RailsAdmin::MainController#dashboard as HTML
  User Load (1.3ms)  SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ?  
[["id", 2], ["LIMIT", 1]]
  ↳ config/initializers/rails_admin.rb:7:in `block (2 levels) in <top (required)>'
   (1.0ms)  SELECT COUNT(*) FROM "active_storage_attachments"
   (1.9ms)  SELECT COUNT(*) FROM "active_storage_attachments"
  ActiveStorage::Attachment Load (1.3ms)  SELECT "active_storage_attachments".* FROM "active_storage_attachments" ORDER BY "active_storage_attachments"."id" DESC LIMIT ?  [["LIMIT", 1]]
  ActiveStorage::Attachment Load (1.2ms)  SELECT "active_storage_attachments".* FROM "active_storage_attachments" ORDER BY "active_storage_attachments"."id" DESC LIMIT ?  [["LIMIT", 1]]
   (1.1ms)  SELECT COUNT(*) FROM "active_storage_blobs"
   (1.0ms)  SELECT COUNT(*) FROM "active_storage_blobs"
  ActiveStorage::Blob Load (1.3ms)  SELECT "active_storage_blobs".* FROM "active_storage_blobs" ORDER BY "active_storage_blobs"."id" DESC LIMIT ?  [["LIMIT", 1]]
  ActiveStorage::Blob Load (1.3ms)  SELECT "active_storage_blobs".* FROM "active_storage_blobs" ORDER BY "active_storage_blobs"."id" DESC LIMIT ?  [["LIMIT", 1]]
   (1.4ms)  SELECT COUNT(*) FROM "messages"
   (1.1ms)  SELECT COUNT(*) FROM "messages"
  Message Load (1.5ms)  SELECT "messages".* FROM "messages" ORDER BY "messages"."id" DESC LIMIT ?  [["LIMIT", 1]]
  Message Load (1.2ms)  SELECT "messages".* FROM "messages" ORDER BY "messages"."id" DESC LIMIT ?  [["LIMIT", 1]]
   (1.1ms)  SELECT COUNT(*) FROM "potetomen"
   (1.1ms)  SELECT COUNT(*) FROM "potetomen"
  Potetoman Load (1.1ms)  SELECT "potetomen".* FROM "potetomen" ORDER BY "potetomen"."id" DESC LIMIT ?  [["LIMIT", 1]]
  Potetoman Load (1.0ms)  SELECT "potetomen".* FROM "potetomen" ORDER BY "potetomen"."id" DESC LIMIT ?  [["LIMIT", 1]]
   (1.1ms)  SELECT COUNT(*) FROM "action_text_rich_texts"
   (1.4ms)  SELECT COUNT(*) FROM "action_text_rich_texts"
  ActionText::RichText Load (1.2ms)  SELECT "action_text_rich_texts".* FROM "action_text_rich_texts" ORDER BY "action_text_rich_texts"."id" DESC LIMIT ?  [["LIMIT", 1]]
   (1.1ms)  SELECT COUNT(*) FROM "users"
  ActionText::RichText Load (297.6ms)  SELECT "action_text_rich_texts".* FROM "action_text_rich_texts" ORDER 
BY "action_text_rich_texts"."id" DESC LIMIT ?  [["LIMIT", 1]]
  User Load (1.2ms)  SELECT "users".* FROM "users" ORDER BY "users"."id" DESC LIMIT ?  [["LIMIT", 1]]
   (1.1ms)  SELECT COUNT(*) FROM "users"
   (1.1ms)  SELECT COUNT(*) FROM "yours"
  User Load (1.6ms)  SELECT "users".* FROM "users" ORDER BY "users"."id" DESC LIMIT ?  [["LIMIT", 1]]
  Your Load (2.5ms)  SELECT "yours".* FROM "yours" ORDER BY "yours"."id" DESC LIMIT ?  [["LIMIT", 1]]
   (1.0ms)  SELECT COUNT(*) FROM "yours"
  Your Load (1.3ms)  SELECT "yours".* FROM "yours" ORDER BY "yours"."id" DESC LIMIT ?  [["LIMIT", 1]]
  Rendering C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/rails_admin-2.0.0/app/views/rails_admin/main/dashboard.html.haml within layouts/rails_admin/application
  Rendering C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/rails_admin-2.0.0/app/views/rails_admin/main/dashboard.html.haml within layouts/rails_admin/application
  Rendered C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/rails_admin-2.0.0/app/views/rails_admin/main/dashboard.html.haml within layouts/rails_admin/application (Duration: 230.9ms | Allocations: 35512)
  Rendered C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/rails_admin-2.0.0/app/views/rails_admin/main/dashboard.html.haml within layouts/rails_admin/application (Duration: 462.6ms | Allocations: 35454)
  Rendered C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/rails_admin-2.0.0/app/views/layouts/rails_admin/_head.html.haml (Duration: 1775.2ms | Allocations: 171990)
  Rendered C:/Ruby25-x64/lib/ruby/gems/2.5.0/gems/rails_admin-2.0.0/app/views/layouts/rails_admin/_head.html.haml (Duration: 1783.7ms | Allocations: 172628)
Completed 500 Internal Server Error in 12135ms (ActiveRecord: 32.1ms | Allocations: 340331)


Completed 500 Internal Server Error in 18150ms (ActiveRecord: 345.6ms | Allocations: 690605)


  
ActionView::Template::Error (Error: File to import not found or unreadable: rails_admin/font-awesome.        
        on line 61:1 of ../../../Ruby25-x64/lib/ruby/gems/2.5.0/gems/rails_admin-2.0.0/app/assets/stylesheets/rails_admin/rails_admin.scss.erb
>> @import 'rails_admin/font-awesome';

   ^
):
    3: %meta{content: "width=device-width, initial-scale=1", name: "viewport; charset=utf-8"}
    4: %meta{content: "NONE,NOARCHIVE", name: "robots"}
    5: = csrf_meta_tag
    6: = stylesheet_link_tag "rails_admin/rails_admin.css", media: :all
    7: = javascript_include_tag "rails_admin/rails_admin.js"

rails_admin (2.0.0) app/assets/stylesheets/rails_admin/rails_admin.scss.erb:61
sassc-2.2.1-x64 (mingw32) lib/sassc/engine.rb:49:in `render'
sprockets (4.0.0) lib/sprockets/sassc_processor.rb:59:in `block in call'
sprockets (4.0.0) lib/sprockets/utils.rb:138:in `module_include'

（省略）

puma (4.3.1) lib/puma/server.rb:328:in `block in run'
puma (4.3.1) lib/puma/thread_pool.rb:134:in `block in spawn_thread'
  
ActionView::Template::Error (Error: File to import not found or unreadable: rails_admin/font-awesome.        
        on line 61:1 of ../../../Ruby25-x64/lib/ruby/gems/2.5.0/gems/rails_admin-2.0.0/app/assets/stylesheets/rails_admin/rails_admin.scss.erb
>> @import 'rails_admin/font-awesome';

   ^
):
    3: %meta{content: "width=device-width, initial-scale=1", name: "viewport; charset=utf-8"}
    4: %meta{content: "NONE,NOARCHIVE", name: "robots"}
    5: = csrf_meta_tag
    6: = stylesheet_link_tag "rails_admin/rails_admin.css", media: :all
    7: = javascript_include_tag "rails_admin/rails_admin.js"

rails_admin (2.0.0) app/assets/stylesheets/rails_admin/rails_admin.scss.erb:61
sassc-2.2.1-x64 (mingw32) lib/sassc/engine.rb:49:in `render'
sprockets (4.0.0) lib/sprockets/sassc_processor.rb:59:in `block in call'
sprockets (4.0.0) lib/sprockets/utils.rb:138:in `module_include'

（省略）

RailsAdmin.config do |config|

  ### Popular gems integration

  ## == Devise ==
  #config.authenticate_with do
     #warden.authenticate! scope: :user
   #end
   #config.current_user_method(&:current_user)

  ## == CancanCan ==
   #config.authorize_with :cancancan

  ## == Pundit ==
  # config.authorize_with :pundit

  ## == PaperTrail ==
  # config.audit_with :paper_trail, 'User', 'PaperTrail::Version' # PaperTrail >= 3.0.0

  ### More at https://github.com/sferik/rails_admin/wiki/Base-configuration

  ## == Gravatar integration ==
  ## To disable Gravatar integration in Navigation Bar set to false
  # config.show_gravatar = true

  config.actions do
    dashboard                     # mandatory
    index                         # mandatory
    new
    export
    bulk_delete
    show
    edit
    delete
    show_in_app

    ## With an audit adapter, you can add:
    # history_index
    # history_show
  end
end

cancancanの設定はしておりません。

Answer 1

ActionView::Template::Error (Error: File to import not found or unreadable: rails_admin/font-awesome.        
        on line 61:1 of ../../../Ruby25-x64/lib/ruby/gems/2.5.0/gems/rails_admin-2.0.0/app/assets/stylesheets/rails_admin/rails_admin.scss.erb
>> @import 'rails_admin/font-awesome';

恐らく上記エラーが原因だと思います。

rails_adminの公式に触れられていますが、未解決のバグっぽいです

以下でrails_adminをgitで指定してダウンロードすれば解決されるはずと記載されていますが、
Rails6については２０１９年８月リリースなので、あまり情報がありませんので解決できるかは不明です。

gem ' rails_admin '、'〜> 2.0 '、git： ' https://github.com/sferik/rails_admin.git '

拘りがなければRails5を利用することをオススメします。

Comments

[yamada_yuuki]

回答ありがとうございます。そうですか。バージョン関係のバグとだけはなんとなくわかっていましたが、まさか未解決だなんて。わざわざrails5に戻すのもあれなのでこのままにしておきます。