必需文件
- pg
- active_support/core_ext/object/try
- active_record/connection_adapters/abstract_adapter
- active_record/connection_adapters/statement_pool
- active_record/connection_adapters/postgresql/column
- active_record/connection_adapters/postgresql/database_statements
- active_record/connection_adapters/postgresql/explain_pretty_printer
- active_record/connection_adapters/postgresql/oid
- active_record/connection_adapters/postgresql/quoting
- active_record/connection_adapters/postgresql/referential_integrity
- active_record/connection_adapters/postgresql/schema_creation
- active_record/connection_adapters/postgresql/schema_definitions
- active_record/connection_adapters/postgresql/schema_dumper
- active_record/connection_adapters/postgresql/schema_statements
- active_record/connection_adapters/postgresql/type_metadata
- active_record/connection_adapters/postgresql/utils
命名空间