[英]How to update maps in a document in firestore with a list of items
I have a list [a,d,f].我有一个列表 [a,d,f]。 I want to increment those fields in the test map respectively.
我想分别增加测试 map 中的那些字段。
If I were to hard code it, it'll look something like this.如果我对它进行硬编码,它看起来会像这样。
firestore.collection('x').doc('y').update({
'test.a':FieldValue.increment(1),
'test.d':FieldValue.increment(1),
'test.f':FieldValue.increment(1),
});
But what if the list always changes.但是如果列表总是变化怎么办。 How can increment the map according to the list every time?
如何每次根据列表递增map? Any suggestion would be appreciated!
任何建议,将不胜感激!
You can try creating a map from that list:您可以尝试从该列表创建一个 map:
var myList = ["a", "d"];
var myMap = { for (var item in myList) 'test.$item': FieldValue.increment(1) };
print(myMap);
// {test.a: FieldValue.increment(1), test.d: FieldValue.increment(1)}
firestore.collection('x').doc('y').update(myMap)
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