How do I get sub collection data on firestore?

firestore(). collection(“reservations/” + tripUid + “/ymuIjdvwWnOr20XWVp6gwRKtmgD2”). get() . This will get all the sub collection documents under the reservation with an held within tripUid variable and within the collection ‘ymuIjdvwWnOr20XWVp6gwRKtmgD2’.

How do you query an array of objects in firestore?

3 Answers. You cannot query fields of objects in arrays in a Firestore query. The array-contains query will instead compare with the objects in an array.

How do I get data from firestore query?

How to get query data using firebase firestore? Simply, use a get() call! query. get().

How do I get data from QueryDocumentSnapshot?

A QueryDocumentSnapshot contains data read from a document in your Firestore database as part of a query. The document is guaranteed to exist and its data can be extracted with . data() or . get() to get a specific field.

How do I use array contains in firestore?

Firebase introduced an array-contains operator that can be used with where to query array fields. It will return all documents that contain a the provided value in the array. Currently, this is only supported with one value, so don’t try chaining more than one of these in a single query. const col = firestore.

Can we write query in Firebase?

Firebase offers various ways of ordering data. In this chapter, we will show simple query examples. We will use the same data from our previous chapters.

What is query document snapshot?

A QueryDocumentSnapshot contains data read from a document in your Cloud Firestore database as part of a query. The document is guaranteed to exist and its data can be extracted using the getData() or the various get() methods in DocumentSnapshot (such as get(String) ).

What is query snapshot?

A QuerySnapshot contains zero or more DocumentSnapshot objects representing the results of a query. The documents can be accessed as an array via the docs property or enumerated using the forEach method. The number of documents can be determined via the empty and size properties.

How do I get all documents from firestore collection?

“firebase get all documents in collection” Code Answer’s

1. // retrieve a collection.
2. db. collection(‘documents’)
3. . get()
4. . then(querySnapshot => {
5. const documents = querySnapshot. docs. map(doc => doc. data())
6. // do something with documents.
7. })
8. ​