Build a CRM App with Ionic 4/Angular and TypeORM: Custom Webpack Configuration [Part 1]

Throughout this tutorial series, we'll be building a CRM application with Ionic 4/Angular and TypeORM.

In this first part tutorial, we'll see how to:

  • Install the Ionic CLI v4,
  • Generate a new Ionic 4 project,
  • Serve your application in development and use the browser to test it,
  • Install TypeORM from npm,
  • Set up and integrate TypeORM with your Ionic 4 project.
  • Use a custom webpack configuration with Ionic 4/Angular.

Let's get started with the prerequisites!

Prerequisites

In order to complete this tutorial, you will need a few requirements:

  • Node.js and NPM installed on your system;
  • Basic knowledge of TypeScript.

Installing Ionic CLI 4

The Ionic command-line interface or CLI is the official tool for generating Ionic projects and work with them.

If you have Node and NPM installed in your machine, open a new terminal and run the following command to install Ionic CLI v4:

$ npm install -g @ionic/cli

Creating an Ionic 4 Project

After installing the Ionic CLI, you can now proceed to create a new project. Navigate to your working directory and run the following commands:

$ ionic start  

You will be prompted for entering:

  • The project's name, enter ionic-crm,
  • The starter template, choose sidemenu.

After that, the project will be generated and dependencies will be installed from npm.

Finally, you will be prompted if you would like to Install the free Ionic Appflow SDK and connect your app? (Y/n) Type n as we'll not use the cloud services in this tutorial.

Now, navigate to your project's root folder and start the development server:

$ cd ionic-crm
$ ionic serve

You server will be listening from the 127.0.0.1:8100 address.

Installing and Integrating TypeORM

After creating the project, let's now install and integrate TypeORM. Open a new terminal, navigate to your project and install TypeORM from npm:

$ cd ionic-crm
$ npm install typeorm --save

As the time of this writing, typeorm v0.2.16 will be installed.

Next, install Node.js types:

$ npm install @types/node --save-dev

Since we'll be doing testing in the browser we also need to install sql.js:

$ npm install sql.js --save

As the time of this writing, sql.js v0.5.0 will be installed.

Next, open the tsconfig.json file and add "typeRoots": ["node_modules/@types"] under compilerOptions if it's not already there.

Next, open the src/tsconfig.app.json and change accordingly:

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "types": ["node"],
    "paths": {
      "typeorm": ["node_modules/typeorm/browser"]
    }
  },
  "exclude": [
    "test.ts",
    "**/*.spec.ts"
  ]
}

Adding a Custom Webpack Configuration

Next, create a custom Webpack configuration file in the root of your project:

$ touch custom.webpack.config.js 

Open the custom.webpack.config.js file and add the following code:

const webpack = require('webpack');
console.log('The custom config is used');
module.exports = {
    plugins: [
        new webpack.ProvidePlugin({
            'window.SQL': 'sql.js/js/sql.js'
        }),
        new webpack.NormalModuleReplacementPlugin(/typeorm$/, function (result) {
            result.request = result.request.replace(/typeorm/, "typeorm/browser");
        })
    ],
    node: {
        fs: 'empty',
        net: 'empty',
        tls: 'empty'
    },
    optimization: {
        minimize: false
    }
};

Next, head back to your terminal and install the @angular-builders/custom-webpack and @angular-builders/dev-server packages from npm:

$ npm install --save @angular-builders/custom-webpack
$ npm install --save @angular-builders/dev-server

The @angular-builders/custom-webpack v7.4.3 and *@angular-builders/dev-server v7.3.1 * packages will be installed.

The @angular-devkit/build-angular:dev-server builder makes use of the custom webpack builder to get webpack configuration. Unlike the default @angular-devkit/build-angular:dev-server it doesn't use@angular-devkit/build-angular:browser configuration to run the development server. If you use @angular-builders/dev-server:generic along with @angular-builders/custom-webpack:browser, ng serve will run with custom configuration provided in the latter.

Now, open the angular.json file, locate the projects -> app -> architect -> build -> builder entry and swap @angular-devkit/build-angular:browser with @angular-builders/custom-webpack:browser.

Next, under the options object, add "customWebpackConfig": {"path": "./custom.webpack.config.js"}:

  "projects": {
    "app": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "prefix": "app",
      "schematics": {},
      "architect": {
        "build": {
          "builder": "@angular-builders/custom-webpack:browser",
          "options": {
            "customWebpackConfig": {
              "path": "./custom.webpack.config.js"
            },

Next, change the builder property under the serve property to @angular-builders/dev-server:generic:

  "projects": {
    "app": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "prefix": "app",
      "schematics": {},
      "architect": {
        "build": {},
        "serve": {
          "builder": "@angular-builders/dev-server:generic",
          "options": {
            "browserTarget": "app:build"
          },

Now, if you serve your application again, the custom Webpack configuration will be used and you should see The custom config is used message displayed in your terminal.

Ionic 4 custom webpack configuration

Creating a First Entity

Let's create an example entity. In your src/ folder create a folder named entities:

$ cd src/
$ mkdir entities

Next, create a contact.ts file and add the following code:

import {Entity, PrimaryGeneratedColumn, Column} from "typeorm";

@Entity('contact')
export class Contact {

    @PrimaryGeneratedColumn()
    id: number;

    @Column()
    firstName: string;

    @Column()
    lastName: string;
}

We created a Contact entity with id, firstName and lastName fields.

Setting up TypeORM

Now, let's set up TypeORM. In your terminal, run the following command to generate a service:

$ ionic generate service orm

Next, open the src/app/orm.service.ts and add the following imports:

import { Platform } from '@ionic/angular';

import {
  createConnection,
  ConnectionOptions,
  getConnection,
  Connection
} from 'typeorm';

import { Contact } from './entities/contact';

Next, inject Platform:

export class OrmService {

  constructor(private platform: Platform) { }

Next, add the following method which creates a connection:

  private createConnection(): Promise<Connection> {
    let dbOptions: ConnectionOptions;

    if (this.platform.is('cordova')) {

      dbOptions = {
        type: 'cordova',
        database: '__crmdb',
        location: 'default'
      };
    } else {

      dbOptions = {
        type: 'sqljs',
        location: 'browser',
        autoSave: true
      };
    }

    Object.assign(dbOptions, {
      logging: ['error', 'query', 'schema'],
      synchronize: true,
      entities: [
        Contact
      ]
    });

    return createConnection(dbOptions);
  }

Next add the ready() method:

  async ready() {
    try {

      await getConnection();

    } catch (ex) {

      console.log('Connection not established!', ex);

      await this.createConnection();

    }
  }

Now, open the src/app/app.component.ts file and import then inject OrmService:

// [...]
import { OrmService } from './orm.service';

@Component({
  selector: 'app-root',
  templateUrl: 'app.component.html'
})
export class AppComponent {
  public appPages = [
    {
      title: 'Home',
      url: '/home',
      icon: 'home'
    },
    {
      title: 'List',
      url: '/list',
      icon: 'list'
    }
  ];

  constructor(
    private platform: Platform,
    private splashScreen: SplashScreen,
    private statusBar: StatusBar,
    private ormService: OrmService
  ) {
    this.initializeApp();
  }

Next, change the initializeApp() method to call the ready() method of OrmService:

  async initializeApp() {
    this.platform.ready().then(() => {
      this.statusBar.styleDefault();
      this.splashScreen.hide();
    });

    await this.ormService.ready();
  }

About the Author

Techiediaries is a website dedicated to bring you tutorials for the latest web technologies


comments powered by Disqus
DMCA.com Protection Status