Unlock the Power of Single-Page Applications with FaunaDB and React

Why Choose FaunaDB?

FaunaDB offers several compelling reasons to choose it for your React app:

• ACID compliance: FaunaDB supports transactions and follows the ACID convention, ensuring data consistency and integrity.
• Scalability: FaunaDB’s architecture allows it to scale according to demand, providing load balancing and distributing instances across the globe.
• Flexible data storage: FaunaDB stores data as enhanced JSON documents, allowing for complex references and nested data structures.
• Ease of use: FaunaDB is designed to be easy to use, freeing developers to focus on building their application rather than setting up and running a backend environment.
• GraphQL playground: FaunaDB’s dashboard features a GraphQL playground, making it easy to import your GraphQL schema using a `.gql` or `.graphql` file.

Getting Started with FaunaDB

To get started with FaunaDB, simply register for a new account and create a new database instance. This will provide you with an access key, which you can use to connect to the database from your React app.

const faunadb = require('faunadb');

const q = faunadb.query;
const client = new faunadb.Client({
  secret: 'YOUR_ACCESS_KEY',
});

Creating a New React App and Integrating FaunaDB

To integrate FaunaDB into your React app, create a new React project and install the required dependencies, including the FaunaDB JavaScript driver. Then, create a new file to define a client and import the faunadb driver.

import React from 'react';
import ReactDOM from 'react-dom';
import { Client } from 'faunadb';

const client = new Client({
  secret: 'YOUR_ACCESS_KEY',
});

const App = () => {
  // ...
};

ReactDOM.render(, document.getElementById('root'));

Building the UI of the Expense App

Using Material UI, create a navigation bar with a title and a input field to add new expenses. Define state variables to store the expense details and create handler functions to update the state and make requests to the database.

import React, { useState } from 'react';
import { TextField, Button } from '@material-ui/core';

const ExpenseApp = () => {
  const [expenseDetail, setExpenseDetail] = useState({
    name: '',
    amount: 0,
  });

  const handleSubmit = (e) => {
    e.preventDefault();
    // ...
  };

  return (

  );
};

Creating an API by Writing Queries

Create a new directory for your API and define queries to read, create, and delete items from the database collection. Use the FaunaDB client to execute these queries and handle any errors that may occur.

const faunadb = require('faunadb');

const q = faunadb.query;
const client = new faunadb.Client({
  secret: 'YOUR_ACCESS_KEY',
});

const createExpenseItem = async (expenseDetail) => {
  try {
    const response = await client.query(
      q.Create(q.Collection('expenses'), {
        data: expenseDetail,
      })
    );
    return response.data;
  } catch (error) {
    console.error(error);
  }
};

const getExpenseItems = async () => {
  try {
    const response = await client.query(
      q.Map(q.Paginate(q.Documents(q.Collection('expenses'))), q.Lambda('ref', q.Get(q.Var('ref'))))
    );
    return response.data;
  } catch (error) {
    console.error(error);
  }
};

const deleteExpenseItem = async (id) => {
  try {
    const response = await client.query(q.Delete(q.Ref(q.Collection('expenses'), id)));
    return response.data;
  } catch (error) {
    console.error(error);
  }
};

Adding an Expense Item to FaunaDB

Import the API function `createExpenseItem` and invoke it in the `handleSubmit` method, passing the `expenseDetail` state variable as an argument.

import React, { useState } from 'react';
import { createExpenseItem } from './api';

const ExpenseApp = () => {
  const [expenseDetail, setExpenseDetail] = useState({
    name: '',
    amount: 0,
  });

  const handleSubmit = (e) => {
    e.preventDefault();
    createExpenseItem(expenseDetail).then((data) => {
      console.log(data);
    });
  };

  return (

  );
};

Displaying the List of Expense Items from the Database

Use the `useEffect` Hook to fetch data from the database collection and display it in a list format. Define a handler function to delete items from the database and update the UI accordingly.

import React, { useState, useEffect } from 'react';
import { getExpenseItems, deleteExpenseItem } from './api';

const ExpenseApp = () => {
  const [expenseItems, setExpenseItems] = useState([]);

  useEffect(() => {
    getExpenseItems().then((data) => {
      setExpenseItems(data);
    });
  }, []);

  const handleDelete = (id) => {
    deleteExpenseItem(id).then((data) => {
      console.log(data);
      setExpenseItems(expenseItems.filter((item) => item.id !== id));
    });
  };

  return (

  );
};