class_docstr: Test the usage of query options to eagerly load specific paths.
  
  This relies upon the 'path' construct used by PropertyOption to relate
  LoaderStrategies to specific paths, as well as the path state maintained
  throughout the query setup/mapper instances process.
class_docstr_tok: ["Test","the","usage","of","query","options","to","eagerly","load","specific","paths",".","This","relies","upon","the","'path","'","construct","used","by","PropertyOption","to","relate","LoaderStrategies","to","specific","paths",",","as","well","as","the","path","state","maintained","throughout","the","query","setup\/mapper","instances","process","."]
code: def setup_mappers(cls):
      Account, Transaction, transactions, accounts, entries, Entry = (
          cls.classes.Account,
          cls.classes.Transaction,
          cls.tables.transactions,
          cls.tables.accounts,
          cls.tables.entries,
          cls.classes.Entry,
      )
  
      cls.mapper_registry.map_imperatively(Account, accounts)
  
      cls.mapper_registry.map_imperatively(Transaction, transactions)
  
      cls.mapper_registry.map_imperatively(
          Entry,
          entries,
          properties=dict(
              account=relationship(
                  Account,
                  uselist=False,
                  backref=backref(
                      "entries",
                      lazy="select",
                      order_by=entries.c.entry_id,
                  ),
              ),
              transaction=relationship(
                  Transaction,
                  uselist=False,
                  backref=backref(
                      "entries",
                      lazy="joined",
                      order_by=entries.c.entry_id,
                  ),
              ),
          ),
      )
  
imports: import datetime
  import sqlalchemy
  from sqlalchemy import ForeignKey
  from sqlalchemy import Integer
  from sqlalchemy import String
  from sqlalchemy import testing
  from sqlalchemy import text
  from sqlalchemy.orm import backref
  from sqlalchemy.orm import relationship
  from sqlalchemy.orm import Session
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing import fixtures
  from sqlalchemy.testing.fixtures import fixture_session
  from sqlalchemy.testing.schema import Column
  from sqlalchemy.testing.schema import Table
label_desc: Use image node_id 3 for calling the EagerTest9 obj's underlying member method code with example usage: obj.setup_mappers(cls) without return types