Question

我见过this question，但它没有回答我的问题，甚至没有回答。

我认为最好用一个例子来解释：

class Blah(Document):
    someList = ListField(StringField())

Blah.drop_collection()

Blah(someList=['lop', 'glob', 'hat']).save()
Blah(someList=['hello', 'kitty']).save()

# One of these should match the first entry
print(Blah.objects(someList__icontains__all=['Lo']).count())
print(Blah.objects(someList__all__icontains=['Lo']).count())

我认为这会打印1, 0或0, 1（或奇迹般的1, 1），而是会给出

0
Traceback (most recent call last):
  File "metst.py", line 14, in <module>
    print(Blah.objects(someList__all__icontains=['lO']).count())
  File "/home/blah/.pythonbrew/pythons/Python-3.1.4/lib/python3.1/site-packages/mongoengine/queryset.py", line 1034, in count
    return self._cursor.count(with_limit_and_skip=True)
  File "/home/blah/.pythonbrew/pythons/Python-3.1.4/lib/python3.1/site-packages/mongoengine/queryset.py", line 608, in _cursor
    self._cursor_obj = self._collection.find(self._query,
  File "/home/blah/.pythonbrew/pythons/Python-3.1.4/lib/python3.1/site-packages/mongoengine/queryset.py", line 390, in _query
    self._mongo_query = self._query_obj.to_query(self._document)
  File "/home/blah/.pythonbrew/pythons/Python-3.1.4/lib/python3.1/site-packages/mongoengine/queryset.py", line 213, in to_query
    query = query.accept(QueryCompilerVisitor(document))
  File "/home/blah/.pythonbrew/pythons/Python-3.1.4/lib/python3.1/site-packages/mongoengine/queryset.py", line 278, in accept
    return visitor.visit_query(self)
  File "/home/blah/.pythonbrew/pythons/Python-3.1.4/lib/python3.1/site-packages/mongoengine/queryset.py", line 170, in visit_query
    return QuerySet._transform_query(self.document, **query.query)
  File "/home/blah/.pythonbrew/pythons/Python-3.1.4/lib/python3.1/site-packages/mongoengine/queryset.py", line 755, in _transform_query
    value = field.prepare_query_value(op, value)
  File "/home/blah/.pythonbrew/pythons/Python-3.1.4/lib/python3.1/site-packages/mongoengine/fields.py", line 594, in prepare_query_value
    return self.field.prepare_query_value(op, value)
  File "/home/blah/.pythonbrew/pythons/Python-3.1.4/lib/python3.1/site-packages/mongoengine/fields.py", line 95, in prepare_query_value
    value = re.escape(value)
  File "/home/blah/.pythonbrew/pythons/Python-3.1.4/lib/python3.1/re.py", line 246, in escape
    return bytes(s)
TypeError: 'str' object cannot be interpreted as an integer

两种查询都无效！

MongoEngine是否支持某种使用icontains和all进行搜索的方式？或者某种方式解决这个问题？

注意：我想使用MongoEngine，而不是PyMongo。

编辑：Python 2.7.3存在同样的问题。

Answer 1

截至目前（版本0.8.0），执行此操作的唯一方法是使用__raw__查询，可能与re.compile()结合使用。像这样：

import re

input_list = ['Lo']
converted_list = [re.compile(q, re.I) for q in input_list]

print(Blah.objects(__raw__={"someList": {"$all": converted_list}}).count())

mongoengine目前无法合并all和icontains，唯一可以与其他运算符一起使用的运算符是not。这是<{3}}中巧妙地提到的，就像它说：

不 - 否定标准支票，可在其他运营商之前使用（例如Q（age_ 不 _mod = 5））

_强调我的

但它没有说你不能与其他运营商这样做，实际情况就是如此。

您可以通过查看来源确认此行为：

版本0.8.0+（the docs - 第42-48行）：

if parts[-1] in MATCH_OPERATORS:
    op = parts.pop()

negate = False
if parts[-1] == 'not':
    parts.pop()
    negate = True

在旧版本中，可以在_transform_query方法中的 mongoengine / queryset.py 中看到上述行。

Mongoengine - 使用所有的icontains

1 个答案: