英文:
Storing data in firestore for multiple layers
问题
我需要在多个级别上存储数据：
Test 1 > q1, q2, q3... > question: hello, answer: opt 2, opt 1: a, opt 2: b, opt 3: c, opt 4: d
所以实际上，我有多个测试，每个测试中有多个问题，每个问题都有多个选项。
如何将其添加到Firestore，并能够快速加载每个测试，因为目前以下代码的加载速度很慢：
for (var i = 1; i < totalquestions + 1; i++) {
await FirebaseFirestore.instance
.collection("users")
.doc(user!.uid)
.collection('Test $no')
.doc(i.toString())
.set(
Map<String, dynamic>.from(
Provider.of<Question>(context, listen: false)
.question[i]!,
),
);
await FirebaseFirestore.instance
.collection("users")
.doc(user.uid)
.collection('Test $no')
.doc(i.toString())
.update(
{
'yourAns':
Provider.of<Question>(context, listen: false)
.answers[i]!
.values
.first
},
);
}
英文:
I need to store data on multiple levels:
Test 1 > q1, q2, q3... > question: hello, answer: opt 2, opt 1: a, opt 2: b, opt 3: c, opt 4: d
So in actual terms I have multiples tests where in each test you have multiple questions and where each question has multiple options.
how can I add it to firestore and be able to load each test fast as at the moment it is delayed for long with the below code:
for (var i = 1; i < totalquestions + 1; i++) {
await FirebaseFirestore.instance
.collection("users")
.doc(user!.uid)
.collection('Test $no')
.doc(i.toString())
.set(
Map<String, dynamic>.from(
Provider.of<Question>(context, listen: false)
.question[i]!,
),
);
await FirebaseFirestore.instance
.collection("users")
.doc(user.uid)
.collection('Test $no')
.doc(i.toString())
.update(
{
'yourAns':
Provider.of<Question>(context, listen: false)
.answers[i]!
.values
.first
},
);
}
答案1
得分: 1
将此发布为社区wiki，以便所有人都能看到。
正如Frank所提到的，Firestore中的嵌套字段在Flutter中会被翻译成嵌套的Map对象。需要考虑的一件事是嵌套字段是否应该是子集合中的documents。这将使您能够单独查询它们并加载数据子集，但会导致您读取更多文档。在这里有一个关于Flutter中嵌套地图的综合答案。
英文:
Posting this as a community wiki for everyone's visibility.
As mentioned by Frank, nested fields in Firestore translate to nested Map objects in Flutter. A thing to consider is whether the nested field should be documents in a subcollection. It will enable you to query them separately and load subsets of data, but you'll end up reading more documents. Here's a comprehensive answer on nested Maps in flutter.
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