Using Firebase orderByChild to access a nested object in the database

In my current project, I am utilizing a real-time database with the following data structure:

{
  "users": {
     "1234": {
       "name": "Joe",
       "externalId": "384738473847",
      },
      "5678": { ... },
      "5555": { ... }
  }
}

My goal is to access a user based on their externalId, and I have implemented the following logic for this purpose:

const snapshot = await admin.database().ref(`/users/`).orderByChild('externalId').equalTo(`${someId}`).once('value')

This code snippet returns the desired object containing user information as follows:

{
    "1234": {
        “name”: Joe,
        “externalId:” 384738473847"
    }
}

Now, I am seeking an alternative method to access the object (with the name and externalId) without prior knowledge of the id (1234).

Currently, I have a workaround in place:

const rootValue = Object.keys(userSnapshot.val())[0]
const user = userSnapshot.val()[rootValue]

Although this solution functions correctly, I came across information suggesting that there may be a more efficient way to achieve this. Are there any improved methods for accessing the object?

typescriptfirebasefirebase-realtime-database

Answer №1

When running a query on the Firebase Database, it is possible to receive multiple results in the snapshot. Even if there is only one result, it will still be wrapped in a list within the snapshot.

To properly handle this list of results in your code, it is recommended to utilize the Snapshot.forEach method provided by Firebase:

const snapshot = await admin.database().ref(`/users/`).orderByChild('externalId').equalTo(`${someId}`).once('value')       
snapshot.forEach((userSnapshot) => {
  console.log(userSnapshot.key);
  console.log(userSnapshot.val());
  console.log(userSnapshot.val().name, userSnapshot.val().externalId);
});

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Using the Vue.js Compositions API to handle multiple API requests with a promise when the component is mounted

I have a task that requires me to make requests to 4 different places in the onmounted function using the composition api. I want to send these requests simultaneously with promises for better performance. Can anyone guide me on how to achieve this effic ...

javascripttypescriptvue.js

While working with Ngrx/effects, an error with code TS2345 occurred. The error message stated that the argument is of type 'Product[]', which cannot be assigned to a parameter of type

When I compile my code, I encounter the following issue (despite not finding any errors in the browser console and the application functioning properly). An error occurs in src/app/services/product.service.ts(15,9): The type 'Observable<Product> ...

javascriptangulartypescriptngrx-storengrx-effects

Trouble with Firebase Web password reset? Let's find a solution!

I am encountering an issue while trying to create a reset password page. When I use the action code provided, it tells me that the code is invalid, even though it should be valid. This leads me to believe that my approach might be incorrect. Interestingl ...

node.jsfirebasefirebase-authentication

Utilizing next.config.js in Next.js TypeScript for personalized settings

As a newcomer to nextjs typescript, I am currently exploring the usage of next.config.js in my nextjs typescript project for custom configurations. Here is an example of what I have attempted: const path = require('path') module.exports = { sa ...

reactjstypescriptsassnext.js

Generating TypeScript declarations for legacy CommonJS dependencies with the correct "module" setting

One of my challenges involves creating type declarations for outdated dependencies that produce CJS modules and lack typings. An example is the aabb-3d module (although this issue isn't specific to that particular module). To generate the declaration ...

typescripttsctype-declaration

How can you verify the value of a disabled HTML input element in TestCafe using Typescript?

TestCafe Typescript - how to verify the value of a disabled HTML input element? Despite being disabled for user interaction, I want to ensure that this element still holds the anticipated value. example public async checksomething(text: string) { co ...

javascripttypescriptui-automatione2e-testingtestcafe

Issues with functionality of React/NextJS audio player buttons arise following implementation of a state

I am currently customizing an Audio Player component in a NextJs application using the ReactAudioPlayer package. However, the standard Import Next/Audio and using just <Audio> without props did not yield the expected results. The player functions as ...

javascriptreactjstypescriptnext.js

Customize your Loopback 4 OpenAPI with NSWAG by making filters optional and specifying data types

I am encountering an issue with the Loopback 4 filter on the generated endpoints being marked as required in my Nswag typescript file. I need it to be optional, but I am struggling to locate where this requirement is originating from. The endpoint from my ...

typescriptloopbackjsopenapiloopback4nswag

The state data is not being properly updated and is getting duplicated

While developing a loop to parse my API data, I encountered an issue where the values obtained were not being captured properly for dynamically loading corresponding components based on their characteristics. The problem arose after implementing useState() ...

reactjstypescriptmaterial-ui

Tips for ensuring a function in Angular is only executed after the final keystroke

I'm faced with the following input: <input type="text" placeholder="Search for new results" (input)="constructNewGrid($event)" (keydown.backslash)="constructNewGrid($event)"> and this function: construct ...

htmlangulartypescriptinputrxjs

When changing the dropdown option on a separate page in React/Next JS, all checkboxes show the clicked style as a result of utilizing useState

I have implemented checkboxes for three different categories: "Types", "Price", and "Categories". They function correctly, with data being passed to a separate checkbox component without any issues. The problem arises when I click a checkbox and then inte ...

javascriptreactjstypescriptnext.jstailwind-css

Utilize variable as both a function and an instance of a class

Is there a way to access a variable as both a function and an object instance using TypeScript? log("something"); log.info("something"); I've attempted various methods, such as modifying the prototype, but nothing has proven succ ...

javascripttypescript

The value is not being found in my form, and the slide-toggle is consistently checked

I am encountering an issue with my forms. On the web, all my slide-toggle options are pre-checked as shown in the image provided. I suspect that the problem lies within the patchFor(){} function. Could someone please review my code for me? I have attempte ...

angulartypescriptangular-material

What is the best way to transform this date string into a valid Firestore timestamp?

Currently, I am facing an issue in my Angular application that is integrated with Firebase Firestore database. The problem lies in updating a date field from a Firestore timestamp field. To provide some context, I have set up an update form which triggers ...

angulartypescriptfirebasegoogle-cloud-firestore

Updating state atoms in Recoil.js externally from components: A comprehensive guide for React users

Being new to Recoil.js, I have set up an atom and selector for the signed-in user in my app: const signedInUserAtom = atom<SignedInUser | null>({ key: 'signedInUserAtom', default: null }) export const signedInUserSelector = selecto ...

javascriptnode.jsreactjstypescriptrecoiljs

What is the best way to combine async/await with a custom Promise class implementation?

I've created a unique Promise class. How can I incorporate it with async/await? type Resolve<T> = (x: T | PromiseLike<T>) => void type Reject = (reason?: any) => void class CustomizedPromise<T> extends Promise<T> { ...

javascripttypescriptasync-awaitpromise

What is the best way to perform a deep copy in Angular 4 without relying on JQuery functions?

Within my application, I am working with an array of heroes which are displayed in a list using *ngFor. When a user clicks on a hero in the list, the hero is copied to a new variable and that variable is then bound to an input field using two-way binding. ...

angulartypescriptclonedeep-copy

Encountering a "Module parse failed" error with type annotations in Nextjs while using Yarn Workspaces

I decided to experiment with transitioning a project from using Vite and React to Next.js and React. After reviewing the documentation on this page: https://nextjs.org/learn-pages-router/foundations/from-react-to-nextjs/getting-started-with-nextjs I made t ...

reactjstypescriptnext.jsannotations

Prisma auto-generating types that were not declared in my code

When working with a many-to-many relationship between Post and Upload in Prisma, I encountered an issue where Prisma was assigning the type 'never' to upload.posts. This prevented me from querying the relationship I needed. It seems unclear why P ...

javascripttypescriptdatabaseprisma

What techniques does Angular2 use to handle dependency injection?

When working with Angular2 components, I know that to inject a dependency, you simply annotate an argument in the constructor, like how ThingService is injected here. However, what I am wondering is how Angular actually knows what to inject at runtime. A ...

javascriptangulartypescript