my Firestore database is organized as follows:
(col = collection, doc = document)
-data (col)
-userid -> random number (doc)
-clients (col)
-clientid -> random number (doc)
-clientid -> random number (doc)
-userid(doc)
-clients (col)
-clientid -> random number (doc)
...
and I need to read all data inside a specific "clientid" document just asking the user to insert it's clientid random number.
I wonder if I can read this data with wildcard syntax like in the rules of database:
var clientid = "65486649466"
var clientdata = db.collection("data").doc({userid}).collection("clients").doc(clientid);
Or there is another way of doing this?
Thanks
There are no wildcards in Firestore client queries. You need to provide the exact values for all collection and document IDs needed to make the query.
If you need to query across all subcollections called "clients" in the entire database (including those nested under "data", and elsewhere), you can instead use a collection group query to find those documents:
const query = db.collectionGroup("clients")
query.get()...
This query will return all the documents among all the subcollections named "clients". Unfortunately, you can't filter this query based on the document ID of each client document. What you would have to do for this is also write the client document ID as a field in each document. Suppose you've done that, and the field name is called "id":
const query = db.collectionGroup("clients").where("id", "==", clientid)
query.get()...
This will give you all the "clients" subcollection documents where the "id" field is clientid.
Related
I need to find the ID of a document, and I must do it by comparing the email that each document contains.
This is my database:
For example, I know the email "mipaciente2#gmail.com", and I don't know what document that email is in, what query do I have to do to search each document until I find the one that contains that email?
You just need to have a subcollection reference which is the patients and then create a query using the where() method to find the email field with a specific value. Though, I'm not sure what version you are using. I'll just give the modular and the namespaced versions. See sample snippets below:
Web Version 9 (modular):
import { collection, query, where } from "firebase/firestore";
// For `user's-document-id`, I guess you have it.
const patientsRef = collection(db, "users", "<user's-document-id>");
// Create a query against the collection.
const q = query(patientsRef, where("email", "==", "mipaciente2#gmail.com"));
Web Version 8 (namespaced):
var patientsRef = db.collection("users").doc("<user's-document-id>").collection("patients);
// Create a query against the collection.
var query = patientsRef.where("email", "==", "mipaciente2#gmail.com");
For more information, you may want to check out this documentation.
I am configuring my Vue/Firebase chat app to save the email address of a registered user in a Firestore collection when the registered user is logged in and submits a message. The Firestore Database looks like the following, with the users added to the "user" collection, and with each user containing a "message" collection:
In my code, I am attempting to add a function that returns the email addresses listed in the "users" collection, as seen in the screenshot:
const contactList = ref([])
const getContacts = () => {
firebase.firestore().collection("users").onSnapshot(snap => {
contactList.value = []
snap.forEach(doc => {
const users = doc.data();
users.id = doc.id;
contactList.value.push(users)
console.log(users)
})
})
},
However, this function does not simply return those email addresses in the user collection, since .collection('users') is the first collection in a chain of docs and collections as indicated in the screenshot. How can I go about returning the list of users in the "users" collection when .collection('users') is the first in a chain of docs and collections?
The document titles are shown in italic, meaning that there are actually no documents with that ID (also shown in the bottom) right and the console merely shows them in order to be able to show the subcollections.
The API won't return such non-existing documents. You'll have to create the document to be able to then read them, for example by running a collection group query over all messages collections and checking if their parent document exists already.
Also see:
Why are non auto-generated document Ids are in italics in Firestore console?
Firestore DB - documents shown in italics
Setting document via subpaths in firebase causes them to show up as italic?
Firestore document/subcollection is not existing
This is the thing I want to accomplish: I'm building a web shop. The web shop has a React Front-end. The front-end fetches 5 collections from Firestore and displays all the items from the collection array on the shop page. A user selects an item on the shop page. I send the item fields such as (price, name, quantity, id) to my express server and the server makes a checkout session of the item fields. The user goes to a Stripe checkout form and is sent back to my front-end by Stripe when the payment is complete. I listen for that event on my server and when then want to update the quantity field of the item in Firestore.
But how do I query Firestore for this item? Is there a way to query Firestore with only this id field (or name field)? Some something like:
db
.collection('collections')
.where('id', '===', 1)
Or do I need to save the document id (of the collection) as a field inside the item map and also send that to Stripe? Or is there a better way to do this? I can't find anything online about this.
Here is a screenshot of Firestore.
Please forgive my beginner question. I'm still learning React, Firestore and Node.js.
First be sure you are sticking to the Firestore terminology correctly. There are collections and there are documents.
Collections you access via a path such as:
collRef = db.collection("products")
collRef = db.collection("products").where("quanity_on_hand", ">", "0")
collRef = db.collection("products").doc("12345").collection("purchase_history")
The latter instance can also be accessed via collRef = db.collection("products/12345/purchase_history").
In all the above cases you will get back a CollectionReference.
Documents you access such as:
docRef = db.collection("products").doc("12345")
docRef = db.doc("products/12345")
This returns you a DocumentReference for the document whose ID is "12345" in the collection "products".
So for your code example above, you want to use docRef = db.doc("collections/1") to get back the DocumentReference for the item you are after. (Or, alternatively, you could use: docRef = db.collection("collections").doc("1")
If you stick with the code that you have above, you'd get back a CollectionReference then you'd need to fetch the data with .get(), then extract the resulting documents (that will just be a single document), then work with that. Oh...and you will need to put an "id" field into all of your documents because the document's ID value (the "name" of the document) is not part of the document by default so if you want to use .where("id", "==", "1"), then you need to add an "id" field to your document and populate it correctly.
If you go with docRef = db.doc("collections/1"), you are querying for the document directly and will get back a reference to just that one. No need for extra fields, nor extracting a single document from a result set.
I can't find how to create a new document without any fields, but one subcollection - messages (and this message collection would have some fields).
This is what I want to do. But I don't want to create subcollection in document which already exist. I want to create new document and subcollection in it.
Honestly I stopped on that :
let chatRef = db.collection("chat_event").add({
})
This answer will greatly help.
let chatRef = db
.collection("chat_event").document("chat1")
.collection("messages").document("message1");
If you don't want to hardcode the parent document's id or if you want a firestore generated id. Then get the id first from firestore's createId() function.
let chatEventId = db.createId();
let chatRef = db
.collection("chat_event").document(chatEventId)
.collection("messages").document("message1");
You could still use auto-generated id for the subcollection's document:
let chatEventId = db.createId();
let messageId = db.createId();
let chatRef = db
.collection("chat_event").document(chatEventId)
.collection("messages").document(messageId);
Note that firestore's autogenerated IDs are entirely random and consequently the documents are not stored in any chronological order. If you will in anyway need some ordering, you could add timestamps to those documents either when you insert data or you update the document with the timestamp info.
docRef.update({
timestamp: firebase.firestore.FieldValue.serverTimestamp()
});
With that, you can order chronologically both in the console and in your own queries.
Check out this answer for more information on auto-generating IDs
My Cloud Firestore looks like this:
users
├────random_id_1───{name, email, ...}
├────random_id_2───{name, email, ...}
...
└────random_id_n───{name, email, ...}
I want to update a document of users given I have an unique identifier for it that is NOT the random id of the document (suppose, for example, the name is unique and I want to use it as identifier).
How can I update a document identifying it by a field of it?
Firestore can only update documents for which it knows the complete reference, which requires the document ID. On your current structure, you will have to run a query to find the document. So something like:
firebase.firestore().collection("users")
.where("name", "==", "Daniel")
.get()
.then(function(querySnapshot) {
querySnapshot.forEach(function(document) {
document.ref.update({ ... });
});
});
If you have another attribute that is unique, I'd always recommend using that as the IDs for the documents. That way you're automatically guaranteed that only one document per user can exist, and you save yourself having to do a query to find the document.