ActiveRecord::ConnectionAdapters::Table:Class (NoMethodError) 的未定义方法“alias_method_chain”。你的意思？别名方法答案

【问题标题】：undefined method `alias_method_chain' for ActiveRecord::ConnectionAdapters::Table:Class (NoMethodError). Did you mean? alias_methodActiveRecord::ConnectionAdapters::Table:Class (NoMethodError) 的未定义方法“alias_method_chain”。你的意思？别名方法
【发布时间】：2020-08-01 16:44:51
【问题描述】：

我在创建迁移时收到此错误。我使用 MySQL 作为数据库，使用 rails 6.0.3.2 和 ruby 2.6.6

完整的错误是

Traceback (most recent call last):
        51: from bin/rails:4:in `<main>'
        50: from bin/rails:4:in `require'
        49: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.3.2/lib/rails/commands.rb:18:in `<top (required)>'
        48: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.3.2/lib/rails/command.rb:46:in `invoke'
        47: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.3.2/lib/rails/command/base.rb:69:in `perform'
        46: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/thor-1.0.1/lib/thor.rb:392:in `dispatch'
        45: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/thor-1.0.1/lib/thor/invocation.rb:127:in `invoke_command'
        44: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/thor-1.0.1/lib/thor/command.rb:27:in `run'
        43: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.3.2/lib/rails/commands/generate/generate_command.rb:21:in `perform'
        42: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.3.2/lib/rails/command/actions.rb:15:in `require_application_and_environment!'
        41: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.3.2/lib/rails/command/actions.rb:28:in `require_environment!'
        40: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.3.2/lib/rails/application.rb:339:in `require_environment!'
        39: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.2/lib/active_support/dependencies.rb:324:in `require'
        38: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.2/lib/active_support/dependencies.rb:291:in `load_dependency'
        37: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.2/lib/active_support/dependencies.rb:324:in `block in require'
        36: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/kernel.rb:34:in `require'
        35: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/kernel.rb:34:in `require'
        34: from C:/Users/Ritvik/Desktop/railsProjs/bkpk/config/environment.rb:5:in `<top (required)>'
        33: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.3.2/lib/rails/application.rb:363:in `initialize!'
        32: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.3.2/lib/rails/initializable.rb:60:in `run_initializers'
        31: from C:/Ruby26-x64/lib/ruby/2.6.0/tsort.rb:205:in `tsort_each'
        30: from C:/Ruby26-x64/lib/ruby/2.6.0/tsort.rb:226:in `tsort_each'
        29: from C:/Ruby26-x64/lib/ruby/2.6.0/tsort.rb:347:in `each_strongly_connected_component'
        28: from C:/Ruby26-x64/lib/ruby/2.6.0/tsort.rb:347:in `call'
        27: from C:/Ruby26-x64/lib/ruby/2.6.0/tsort.rb:347:in `each'
        26: from C:/Ruby26-x64/lib/ruby/2.6.0/tsort.rb:349:in `block in each_strongly_connected_component'
        25: from C:/Ruby26-x64/lib/ruby/2.6.0/tsort.rb:431:in `each_strongly_connected_component_from'
        24: from C:/Ruby26-x64/lib/ruby/2.6.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
        23: from C:/Ruby26-x64/lib/ruby/2.6.0/tsort.rb:228:in `block in tsort_each'
        22: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.3.2/lib/rails/initializable.rb:61:in `block in run_initializers'
        21: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.3.2/lib/rails/initializable.rb:32:in `run'
        20: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.3.2/lib/rails/initializable.rb:32:in `instance_exec'
        19: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/foreigner-1.7.4/lib/foreigner/railtie.rb:4:in `block in <class:Railtie>'
        18: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.2/lib/active_support/lazy_load_hooks.rb:42:in `on_load'
        17: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.2/lib/active_support/lazy_load_hooks.rb:42:in `each'
        16: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.2/lib/active_support/lazy_load_hooks.rb:43:in `block in on_load'
        15: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.2/lib/active_support/lazy_load_hooks.rb:66:in `execute_hook'
        14: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.2/lib/active_support/lazy_load_hooks.rb:61:in `with_execution_control'
        13: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.2/lib/active_support/lazy_load_hooks.rb:71:in `block in execute_hook'
        12: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.2/lib/active_support/lazy_load_hooks.rb:71:in `class_eval'
        11: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/foreigner-1.7.4/lib/foreigner/railtie.rb:5:in `block (2 levels) in <class:Railtie>'
        10: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/foreigner-1.7.4/lib/foreigner/loader.rb:3:in `load'
         9: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/foreigner-1.7.4/lib/foreigner/loader.rb:3:in `module_eval'
         8: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/foreigner-1.7.4/lib/foreigner/loader.rb:5:in `block in load'
         7: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/foreigner-1.7.4/lib/foreigner/loader.rb:5:in `include'
         6: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/foreigner-1.7.4/lib/foreigner/connection_adapters/abstract/schema_definitions.rb:5:in `included'
         5: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/foreigner-1.7.4/lib/foreigner/connection_adapters/abstract/schema_definitions.rb:5:in `class_eval'
         4: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/foreigner-1.7.4/lib/foreigner/connection_adapters/abstract/schema_definitions.rb:6:in `block in included'
         3: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/foreigner-1.7.4/lib/foreigner/connection_adapters/abstract/schema_definitions.rb:6:in `include'
         2: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.2/lib/active_support/concern.rb:122:in `append_features'
         1: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/activesupport-6.0.3.2/lib/active_support/concern.rb:122:in `class_eval'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/foreigner-1.7.4/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

我在 stackoverflow 上查看过类似的错误，但没有找到解决问题的方法。 gemfile 有gem 'mysql2', '>= 0.4.4'。我在 MySQL 0.5.3 上尝试过，但仍然没有运气。

【问题讨论】：

标签： ruby-on-rails ruby

【解决方案1】：

你的 gemfile 里有外国人 gem 吗？您可以尝试删除它，进行捆绑安装并重试吗？根据gem 的文档，它在rails 4.2 中已经过时，因为rails 添加了对该功能的本机支持。

如果它不在你的gemfile中，你需要检查什么gem依赖它。

【讨论】：

是的，我有外国人。我删除了它，bundle install 没有，我收到以下错误：``` undefined method `alias_method_chain' for ActionDispatch::Request:Class (NoMethodError) 你的意思是？别名方法```
你能告诉我现在提升它的宝石吗？您发布的错误日志行将位于它来自的 gem 之前。就像您在抛出相同错误的行中的问题一样，该行的开头表明它来自 'foreigner-1.7.4/lib/foreigner/connection_adapters/abstract/table.rb:7' 。我认为您的 gemfile 包含一堆使用已弃用的旧 Rails 功能的 gem。