英文:
Can I sort with Firebase Firestore child with the Python SDK?
问题
我有一个 Firebase Firestore 数据，结构如下，但是在尝试按子项排序时出现了问题。
{'agreement': 'ALR87HJLKJJ78954','agreementDetails': {'name': 'johnny5isalive','country': 'Spain'}}
我的查询如下所示：
query = db.collection('rentalAgreements').where('agreement', '==', agreement_number).order_by('/agreementDetails/name', direction=firestore.Query.ASCENDING).limit(10)results = query.get()
我收到以下错误：
ValueError: Path /agreementDetails/name not consumed, residue: /agreementDetails/name
我确实认为我在冒险尝试，通过谷歌找到了一些关于 order_by_child 的引用，我也尝试过，但返回了错误：
AttributeError: 'Query' object has no attribute 'order_by_child'
这是可能的吗？
英文:
I have a Firebase Firestore with data structured as per below but am having issues being able to sort by a child.
{'agreement' : 'ALR87HJLKJJ78954','agreementDetails' : {'name' : 'johnny5isalive','country' : 'Spain'}}
My query looks like the following:
query = db.collection('rentalAgreements').where('agreement', '==', agreement_number).order_by('/agreementDetails/name', direction=firestore.Query.ASCENDING).limit(10)results = query.get()
I get the following error:
> ValueError: Path /agreementDetails/name not consumed, residue:
> /agreementDetails/name
I did think I was chancing it a bit and found through Google a number of references to order_by_child which I also tried but it came back with an error:
> AttributeError: 'Query' object has no attribute 'order_by_child'
Is this possible?
答案1
得分: 3
引用对象属性时，您需要在字段路径中使用点表示法：
query = db.collection('rentalAgreements').where('agreement', '==', agreement_number).order_by('agreementDetails.name', direction=firestore.Query.ASCENDING).limit(10)
英文:
When referencing an object property, you will need to use dot notation in the field path:
query = db.collection('rentalAgreements').where('agreement', '==', agreement_number).order_by('agreementDetails.name', direction=firestore.Query.ASCENDING).limit(10)
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