在 boolean 字段上使用過濾器的 djongo query_set

Question

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我有一個 django 應用程序，將 djongo 作為數據庫驅動程序。 我的 model 很簡單：

from django.db import models
from djongo.models import ObjectIdField

class TmpModel(models.Model):
    _id = ObjectIdField()
    is_deleted = models.BooleanField(default=False)

當我在 shell 中運行簡單的過濾器命令時：

>>> TmpModel().save()   
>>> TmpModel(is_deleted=True).save() 
>>> TmpModel.objects.filter(is_deleted=False).all() 

我收到一個錯誤：

(0.000) QUERY = 'SELECT "solutions_tmpmodel"."_id", "solutions_tmpmodel"."is_deleted" FROM "solutions_tmpmodel" WHERE NOT "solutions_tmpmodel"."is_deleted" LIMIT 21' - PARAMS = (); args=(); alias=default
Traceback (most recent call last):
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\sql2mongo\query.py", line 857, in parse
    return handler(self, statement)
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\sql2mongo\query.py", line 933, in _select
    return SelectQuery(self.db, self.connection_properties, sm, self._params)
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\sql2mongo\query.py", line 116, in __init__
    super().__init__(*args)
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\sql2mongo\query.py", line 62, in __init__
    self.parse()
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\sql2mongo\query.py", line 152, in parse
    self.where = WhereConverter(self, statement)
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\sql2mongo\converters.py", line 27, in __init__
    self.parse()
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\sql2mongo\converters.py", line 119, in parse
    self.op = WhereOp(
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\sql2mongo\operators.py", line 476, in __init__
    self.evaluate()
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\sql2mongo\operators.py", line 465, in evaluate
    op.evaluate()
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\sql2mongo\operators.py", line 258, in evaluate
    self.rhs.negate()
AttributeError: 'NoneType' object has no attribute 'negate'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\cursor.py", line 51, in execute
    self.result = Query(
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\sql2mongo\query.py", line 784, in __init__
    self._query = self.parse()
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\sql2mongo\query.py", line 885, in parse
    raise exe from e
djongo.exceptions.SQLDecodeError:

        Keyword: None
        Sub SQL: None
        FAILED SQL: SELECT "solutions_tmpmodel"."_id", "solutions_tmpmodel"."is_deleted" FROM "solutions_tmpmodel" WHERE NOT "solutions_tmpmodel"."is_deleted" LIMIT 21
        Params: ()
        Version: 1.3.6

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\django\db\backends\utils.py", line 89, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\cursor.py", line 59, in execute
    raise db_exe from e
djongo.database.DatabaseError

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\django\db\models\query.py", line 370, in __repr__
    data = list(self[: REPR_OUTPUT_SIZE + 1])
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\django\db\models\query.py", line 394, in __iter__
    self._fetch_all()
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\django\db\models\query.py", line 1866, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\django\db\models\query.py", line 87, in __iter__
    results = compiler.execute_sql(
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\django\db\models\sql\compiler.py", line 1398, in execute_sql
    cursor.execute(sql, params)
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\django\db\backends\utils.py", line 103, in execute
    return super().execute(sql, params)
s.py", line 89, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\user\AppData\Local\pypoetry\Cache\virtualenvs\test-task-YJIxAxLW-py3.10\lib\site-packages\djongo\cursor.py", line 59, in execute
    raise db_exe from e
django.db.utils.DatabaseError

如何找出問題所在？

Answer 1

將djongo的 model 字段用於您擁有的所有字段，而不是django字段

from djongo import models

class TmpModel(models.Model):
    _id = models.ObjectIdField()
    is_deleted = models.BooleanField(default=False)

Answer 2

這似乎是 Djongo 的Boolean SQL 條件解析的問題（GitHub 問題 #562） 。 目前，解決方案是使用__in查詢：

TmpModel.objects.filter(is_deleted__in=[False]).all() 

Answer 3

這已在djongo@8587ea7中修復（截至 2022 年 12 月， 沒有計划發布）。

pip install git+https://github.com/doableware/djongo.git@8587ea766e4610da5f31112f7b134699e2d603ee

Djongo <= 1.3.6 的解決方法來自doableware/djongo#562（評論 892486144） ：

 from djongo.base import DatabaseWrapper from djongo.operations import DatabaseOperations class PatchedDatabaseOperations(DatabaseOperations): def conditional_expression_supported_in_where_clause(self, expression): return False DatabaseWrapper.ops_class = PatchedDatabaseOperations