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尝试在 Mac Catalina 10.15.7 上的 JRuby 9.3.3.0 上使用 ActiveRecord 和 Postgres，同时运行 Postgres 服务器。按照@hmdne 的建议，按照 github.com/jruby/activerecord-jdbc-adapter 上的说明进行操作。我看到错误：

NameError: 未初始化的常量 ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::PG

这是我的代码：

require 'active_record'
require 'activerecord-jdbc-adapter' if defined? JRUBY_VERSION

ActiveRecord::Base.establish_connection(
  adapter: "postgresql",
  host: "localhost",
  database: "test",
  username: "postgres",
  password: "password")

堆栈跟踪包含条目

/Users/test/.rvm/gems/jruby-9.3.3.0/gems/activerecord-6.1.4.6/lib/active_record/connection_adapters/postgresql_adapter.rb:937

第 937 行是

类 MoneyDecoder < PG::SimpleDecoder # :nodoc:

所以 ActiveRecord 是 PG 中的一个类的子类化，但 PG 不会建立在 JRuby 之上。尝试执行 'gem install activerecord-postgresql-adapter' 但安装失败，因为该 gem 还依赖于 'pg' gem。

尝试了行“需要'activerecord-jdbcpostgresql-adapter'如果定义？JRUBY_VERSION”代替或除了需要'activerecord-jdbc-adapter'，但我仍然得到相同的'未初始化常量ActiveRecord :: ConnectionAdapters :: PostgreSQLAdapter： :PG'，并且基本上是相同的堆栈跟踪。

我正在使用所有宝石的最新版本。谢谢！！！

/bin/zsh -c "bash -c '/Users/test/.rvm/bin/rvm jruby-9.3.3.0 do /Users/test/.rvm/rubies/jruby-9.3.3.0/bin/jruby /Users/test/RubymineProjects/glimmer/TaskTimer2/lib/testSO.rb'"
NameError: uninitialized constant ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::PG
        load_missing_constant at /Users/test/.rvm/gems/jruby-9.3.3.0/gems/activesupport-6.1.4.6/lib/active_support/dependencies.rb:603
                const_missing at /Users/test/.rvm/gems/jruby-9.3.3.0/gems/activesupport-6.1.4.6/lib/active_support/dependencies.rb:213
    <class:PostgreSQLAdapter> at /Users/test/.rvm/gems/jruby-9.3.3.0/gems/activerecord-6.1.4.6/lib/active_record/connection_adapters/postgresql_adapter.rb:937
  <module:ConnectionAdapters> at /Users/test/.rvm/gems/jruby-9.3.3.0/gems/activerecord-6.1.4.6/lib/active_record/connection_adapters/postgresql_adapter.rb:73
        <module:ActiveRecord> at /Users/test/.rvm/gems/jruby-9.3.3.0/gems/activerecord-6.1.4.6/lib/active_record/connection_adapters/postgresql_adapter.rb:45
                       <main> at /Users/test/.rvm/gems/jruby-9.3.3.0/gems/activerecord-6.1.4.6/lib/active_record/connection_adapters/postgresql_adapter.rb:22
                      require at org/jruby/RubyKernel.java:1017
                      require at /Users/test/.rvm/rubies/jruby-9.3.3.0/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:85
                      require at /Users/test/.rvm/gems/jruby-9.3.3.0/gems/activesupport-6.1.4.6/lib/active_support/dependencies.rb:332
              load_dependency at /Users/test/.rvm/gems/jruby-9.3.3.0/gems/activesupport-6.1.4.6/lib/active_support/dependencies.rb:299
                      require at /Users/test/.rvm/gems/jruby-9.3.3.0/gems/activesupport-6.1.4.6/lib/active_support/dependencies.rb:332
          resolve_pool_config at /Users/test/.rvm/gems/jruby-9.3.3.0/gems/activerecord-6.1.4.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:1205
         establish_connection at /Users/test/.rvm/gems/jruby-9.3.3.0/gems/activerecord-6.1.4.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:1046
         establish_connection at /Users/test/.rvm/gems/jruby-9.3.3.0/gems/activerecord-6.1.4.6/lib/active_record/connection_handling.rb:52
                       <main> at /Users/test/RubymineProjects/glimmer/TaskTimer2/lib/testSO.rb:4

Process finished with exit code 1
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