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Firebase deep increment of a field in a data base


Firebase deep increment of a field in a data base

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Firebase deep increment of a field in a data base
Tag : node.js , By : user87225
Date : January 12 2021, 01:40 AM

wish help you to fix your issue I have this structure: Users is a collection, inside there are userIDs docs, each has a user object which contains also an object with a certain nick name . , solved
docRef.update({ ['user.analytics.' + nickID + '.visitors']: admin.firestore.FieldValue.increment(1) });

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How to join denormalized data that goes two+ levels deep in Firebase


Tag : firebase , By : fukas78
Date : March 29 2020, 07:55 AM
help you fix your problem See a working example here
The gist of this sort of denormalization is to fetch the users as you grab posts. It's nothing more complex than it sounds. Just go grab them.
<h3>Normalizing user profiles into posts</h3>

<ul ng-controller="ctrl">
    <li ng-repeat="post in posts | orderByPriority" ng-init="user = users.$load(post.user)">
        {{user.name}}: {{post.title}}
    </li>
</ul>
var app = angular.module('app', ['firebase']);
var fb = new Firebase(URL);

app.controller('ctrl', function ($scope, $firebase, userCache) {
    $scope.posts = $firebase(fb.child('posts'));
    $scope.users = userCache(fb.child('users'));
});

app.factory('userCache', function ($firebase) {
    return function (ref) {
        var cachedUsers = {};
        cachedUsers.$load = function (id) {
            if( !cachedUsers.hasOwnProperty(id) ) {
                cachedUsers[id] = $firebase(ref.child(id));
            }
            return cachedUsers[id];
        };
        cachedUsers.$dispose = function () {
            angular.forEach(cachedUsers, function (user) {
                user.$off();
            });
        };
        return cachedUsers;
    }
});

Firebase - Indexing Data Two Levels Deep


Tag : firebase , By : Derek
Date : March 29 2020, 07:55 AM
Does that help I have a Firebase data structure that looks like: , You can specify dynamic .indexOn like this:
{
    "rules" : {
        "messages" : {
            "$userId": {
                ".indexOn" : ["message", "direction"]
            }
        }
    }
}

Access to Deep data via Firebase Admin


Tag : javascript , By : Tom
Date : March 29 2020, 07:55 AM
Does that help How Can I Access to Deep data via Firebase Admin? , To get the keyboard children:
const ref = db.ref('keyboards/SecendKeyboard/childs');
ref.on("value", function (snapshot) {
    console.log(snapshot.val());
});
const ref = db.ref('keyboards/SecendKeyboard');
ref.on("value", function (snapshot) {
    console.log(snapshot.child("childs").val());
});
const ref = db.ref('keyboards');
ref.on("value", function (snapshot) {
    snapshot.forEach(function(childSnapshot) {
        console.log(snapshot.val()); // prints StartKeyboard and SecendKeyboard
        if (snapshot.child("SecendKeyboard").exists()) {
            console.log(snapshot.child("SecendKeyboard").val());
        }
    })
});

How to target specific field in Firebase / AngularFire when more than 1 level deep


Tag : angularjs , By : kuba53280
Date : March 29 2020, 07:55 AM

Is there any way to auto increment a field in firebase


Tag : javascript , By : Terrence Poon
Date : March 29 2020, 07:55 AM
Any of those help I want to auto increment a stock number for each new item added to the firestore database. (Not using the push() method) , You can do it easily using Cloud Functions
// Change '/COLLECTION/{DOC}' to which document do you want to increment the counter when it's created
exports.counter = functions.firestore.document('/COLLECTION/{DOC}').onCreate((snap, context) => {
  const db = admin.firestore();

  // Change 'counter/ref' to where do you want to increment
  const countRef = db.doc('counter/ref');
  return db.runTransaction(t => {
    return t.get(countRef).then(doc => {
      const counter = (doc.data().counter || 0) + 1;
      t.update(countRef, {counter: counter});
    });
  });
});

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