Railsでmodelを作成時のエラーが解決できずに困っております。

Question

Rails5.1.3でWebアプリケーション制作の勉強をしています。
Rubyのバージョンは2.3.1です。

新規にテーブルを作成するべく　$bin/rails g model point を実行すると　NoMethodError がでてしまい
解決できずに困っております。エラーの内容は以下になります。

エラー（抜粋）

undefined method `alias_method_chain' for ActiveRecord::ConnectionAdapters::Table:Class (NoMethodError)
Did you mean?  alias_method

エラー（全文）

[vagrant@localhost edamame]$ bin/rails g model point
      invoke  active_record
/home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/foreigner-1.6.1/lib/foreigner/connection_adapters/abstract/table.rb:7:in `block in <module:Table>': undefined method `alias_method_chain' for ActiveRecord::ConnectionAdapters::Table:Class (NoMethodError)
Did you mean?  alias_method
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/concern.rb:120:in `class_eval'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/concern.rb:120:in `append_features'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/foreigner-1.6.1/lib/foreigner/connection_adapters/abstract/schema_definitions.rb:6:in `include'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/foreigner-1.6.1/lib/foreigner/connection_adapters/abstract/schema_definitions.rb:6:in `block in included'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/foreigner-1.6.1/lib/foreigner/connection_adapters/abstract/schema_definitions.rb:5:in `class_eval'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/foreigner-1.6.1/lib/foreigner/connection_adapters/abstract/schema_definitions.rb:5:in `included'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/foreigner-1.6.1/lib/foreigner/loader.rb:5:in `include'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/foreigner-1.6.1/lib/foreigner/loader.rb:5:in `block in load'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/foreigner-1.6.1/lib/foreigner/loader.rb:3:in `module_eval'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/foreigner-1.6.1/lib/foreigner/loader.rb:3:in `load'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/foreigner-1.6.1/lib/foreigner/railtie.rb:5:in `block (2 levels) in <class:Railtie>'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:69:in `instance_eval'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:69:in `block in execute_hook'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:60:in `with_execution_control'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:65:in `execute_hook'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:50:in `block in run_load_hooks'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:49:in `each'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/lazy_load_hooks.rb:49:in `run_load_hooks'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.1.6/lib/active_record/base.rb:326:in `<module:ActiveRecord>'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.1.6/lib/active_record/base.rb:25:in `<top (required)>'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `require'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `block in require'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:258:in `load_dependency'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.1.6/lib/active_support/dependencies.rb:292:in `require'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/generators/named_base.rb:211:in `pluralize_table_names?'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/generators/named_base.rb:127:in `table_name'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.1.6/lib/rails/generators/active_record/model/model_generator.rb:20:in `create_migration_file'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `block in invoke_all'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `each'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `map'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `invoke_all'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/group.rb:232:in `dispatch'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:115:in `invoke'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/group.rb:277:in `block in _invoke_for_class_method'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/shell.rb:68:in `with_padding'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/group.rb:266:in `_invoke_for_class_method'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/group.rb:133:in `_invoke_from_option_orm'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `block in invoke_all'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `each'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `map'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `invoke_all'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/group.rb:232:in `dispatch'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/base.rb:466:in `start'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/generators.rb:269:in `invoke'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/commands/generate/generate_command.rb:24:in `perform'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/thor-0.20.0/lib/thor.rb:387:in `dispatch'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/command/base.rb:63:in `perform'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/command.rb:44:in `invoke'
        from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.1.6/lib/rails/commands.rb:16:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'

解決方法をどなたか教えていただけないでしょうか？宜しくお願いします。

Answer 1

alias_method_chainがない、というエラーですが、このメソッドはRails 5でdeprecatedとなっています。

そして、それが出ているforeignerは、Railsのマイグレーションで外部キーをかけるためのものですが、実はRails 4.2の時点で外部キー作成の機能は本体に備わっています。なので、「Gemfileからforeignerを外す」というのが適当な手段だと考えます。

Comments

[koume]

お礼の返事が遅くなり大変失礼しました。いつも的確な回答をありがとうございます。おかげさまでテーブルを作成することができました。今後とも宜しくお願いします。