Question

我希望只有在没有user = User.query.filter_by(deleted=0).get(id)的情况下才能通过ID获取用户。我试过了

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/david/.virtualenvs/flask-sqlalchemy/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 831, in get
    return self._get_impl(ident, loading.load_on_ident)
  File "/home/david/.virtualenvs/flask-sqlalchemy/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 864, in _get_impl
    return fallback_fn(self, key)
  File "/home/david/.virtualenvs/flask-sqlalchemy/lib/python3.6/site-packages/sqlalchemy/orm/loading.py", line 177, in load_on_ident
    q._get_condition()
  File "/home/david/.virtualenvs/flask-sqlalchemy/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 350, in _get_condition
    "get", order_by=False, distinct=False)
  File "/home/david/.virtualenvs/flask-sqlalchemy/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 368, in _no_criterion_condition
    self._no_criterion_assertion(meth, order_by, distinct)
  File "/home/david/.virtualenvs/flask-sqlalchemy/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 365, in _no_criterion_assertion
    "Query with existing criterion. " % meth)
sqlalchemy.exc.InvalidRequestError: Query.get() being called on a Query with existing criterion.

但收到了错误。如何过滤查询并按ID获取？

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Answer 1

正如错误所述，get仅在您未过滤查询时才有效。如果您要进行过滤，请按id进行过滤，然后使用first。

user = User.query.filter_by(id=id, deleted=0).first()

过滤查询然后使用SQLAlchemy按ID获取行

1 个答案: