关于python：SQLalchemy找不到用于创建外键的表

SQLalchemy not find table for creating foreign key

我对SQL炼金术有问题，在尝试创建数据库时，我得到：

"sqlalchemy.exc.NoReferencedTableError: Foreign key associated with
column 'estate_agent.person_id' could not find table 'person' with
which to generate a foreign key to target column 'id'"

元数据：

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db = create_engine('postgresql+psycopg2:...//')
meta = MetaData()
meta.bind = db

人员表：

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tbl_person = Table(
'person', meta,
Column('id', Integer, Sequence('seq_person_id'), primary_key=True),
Column('name', String(100), unique=True, nullable = False),
Column('password', String(40), nullable = False),
Column('person_type_id', Integer, ForeignKey("person_type.id"), nullable = False),
Column('register_date', DateTime, default = datetime.now),
Column('pendencies', String(200)),
Column('active', Boolean, default = True),
schema = 'public')

错误表：

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tbl_estate_agent = Table(
'estate_agent', meta,
Column('person_id', Integer, ForeignKey("person.id"), primary_key = True),
Column('prize_range_id', Integer, ForeignKey("prize_range.id"), nullable = False),
schema = 'public')

普通表(通常创建FK)

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tbl_person_agent = Table(
'person_agent', meta,
Column('person_id', Integer, ForeignKey("person.id"), primary_key = True),
Column('prize_range_id', Integer, ForeignKey("prize_range.id"), nullable = False),
schema = 'public')

创建调用：

1	meta.create_all(checkfirst=True)

完整的错误日志：

Traceback (most recent call last): File"database_client.py", line
159, in
meta.create_all(checkfirst=True) File"/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/schema.py",
line 3404, in create_all
tables=tables) File"/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py",
line 1616, in _run_visitor
conn._run_visitor(visitorcallable, element, **kwargs) File"/usr/local/lib/python2.7/dist-packages/sqlalchemy/engine/base.py",
line 1245, in _run_visitor
**kwargs).traverse_single(element) File"/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/visitors.py",
line 120, in traverse_single
return meth(obj, **kw) File"/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/ddl.py", line
699, in visit_metadata
collection = [t for t in sort_tables(tables) File"/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/ddl.py", line
862, in sort_tables
{'foreign_key': visit_foreign_key}) File"/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/visitors.py",
line 256, in traverse
return traverse_using(iterate(obj, opts), obj, visitors) File"/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/visitors.py",
line 247, in traverse_using
meth(target) File"/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/ddl.py", line
853, in visit_foreign_key
parent_table = fkey.column.table File"/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py",
line 725, in get
obj.dict[self.name] = result = self.fget(obj) File"/usr/local/lib/python2.7/dist-packages/sqlalchemy/sql/schema.py",
line 1720, in column tablekey)
sqlalchemy.exc.NoReferencedTableError: Foreign key associated with
column 'estate_agent.person_id' could not find table 'person' with
which to generate a foreign key to target column 'id'

解决方案是用实际列替换字符串：

1	Column('person_id', Integer, ForeignKey(tbl_person.c.id), primary_key=True)