我可以在Firestore中查询嵌套的文档值吗? [英] Can I query a nested document value in firestore?

问题描述

我正在搜索Firestore中的以下数据:集合->文档-> {日期{月:10，年:2017}}

I'm looking to do a search on the following data in firestore: Collection->Document->{date{month:10,year:2017}}

var ref = db.collection(collection).doc(document)
ref.where('date.month', '==', 10).get().then(doc=>{
    if (!doc.exists) {
        console.log('No such document!');
    } else {
        console.log('Document data:', doc.data());
    }
}).catch(err => {
    console.log('Error getting document', err);
});

上面的伪代码不起作用.有什么建议么?

The above pseudo code does not work. Any suggestions?

推荐答案

您似乎在查询文档:

var ref = db.collection(collection).doc(document)

相反，您应该查询您的收藏:

In stead you should be querying your collection:

var ref = db.collection(collection)

您的查询将在您的集合中的文档数组中拾取所有符合"date.month == 10"标准的文档.

Your query will pick up all documents, which meet "date.month==10" criteria among array of documents in your collection.

我还认为您必须更改解析来自.get()的数据的方式，因为它将成为数组:

Also I think you have to change how you parse the data coming from .get() because it's going to be an array:

.then(function(querySnapshot) {
        querySnapshot.forEach(function(doc) {
            console.log(doc.id, " => ", doc.data());
        });
    })

此链接应该有助于理解这个想法.

This link should be also helpful to get the idea.

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