Question

I have the following JSON stored on my local which I want to store it on Firebase Firestore:

guides: [  
    {  
       "id":0
       "name":"name0",
       "sources":[
           {
               "type":"s3",
               "url":"https://s3.amazonaws.com/xxxx/file0.mp3"
           }
       ]
    },
    {  
       "id":1
       "name":"name1",
       "sources":[
           {
               "type":"s3",
               "url":"https://s3.amazonaws.com/xxxx/file1.mp3"
           }
       ]
    }
]

What is the best solution for store "sources"? so when I make a search for "guides" (using firebase cloud functions), it retrieves the source list as well without making different searchs for each element of sources.

In Firebase Firestore, the array type doesn't allow a list of objects and I tried with "reference" but it returns the "structure and settings" of the document which is referencing.

function getGuides(guideId,response){
  db.collection('guides')
.where('id', '==', guideId).get()
.then(snapshot => {
    let guideDoc = snapshot.docs.map( doc => {
        return doc.data()
        })
    return guideDoc;
})

Answer 1

在回答中，您说“在Firebase Firestore中，数组类型不允许对象列表”。

这是不正确的：您可以将对象存储在数组中。使用Firebase控制台，您必须首先选择阵列数据类型，然后为每个阵列成员选择映射类型。使用JavaScript SDK，您可以保存包含对象数组的文档。

基于上述情况，使用Firestore时可以采用以下方法：

收集了guide个文档
对于此集合中的每个guide文档：
- 使用id值作为文档ID；
- 有一个类型为数组的字段sources，您可以在其中存储对象，例如在问题中显示的对象。

这样，您可以按文档guides查询id并按以下方式获取数组：

var docRef = db.collection("guides").doc(guideId);

docRef.get().then(doc => {
    if (doc.exists) {
        const sourcesArray = doc.data().sources;
        sourcesArray.forEach((element) => {
            console.log(element.type); 
            console.log(element.url); 
        });
    } else {
        // doc.data() will be undefined in this case
        console.log("No such document!");
    }
}).catch(function(error) {
    console.log("Error getting document:", error);
});

Firebase Cloud Firestore and Functions - store documents with array of objects

1 个答案: