Build a Node App With Postgres and Docker download

Refresh the browser and you should see the change reflected. You are on your way to developing a happy little web application!

You can skip ahead to the next section. We are going to use PostgreSQL to store weight measurements. However, installing server software like PostgreSQL on a development machine is no trivial task. Next, create an instance of a PostgreSQL database server. Feel free to change the administrator password value. Note: If you restart your computer, you may need to restart the Docker container. You can do that from the command line using the following command: docker start measurements. Add the following settings to the end of the.

Note: If you changed the database administrator password, or you have different credentials for an existing server, be sure to update the values to match your specific environment. To use a new database, you need a way to create tables, add initial data, and so forth. One way to do that is to create a script. Create a folder in the root of the project named tools. In this folder, create a new file named initdb.

Next, update the scripts section in the package. You should see the message finished at the console. A new table named measurements is in your database! Any time you want to reset your database, just rerun the script. When building an application like this weight tracker, you will probably want your data kept private and safe. It would be nice to share this application with others so they can take advantage of it, too.

However, to build user registration and login authentication from scratch is no trivial task. There are registration, login, and password reset forms, email verification steps, encrypting passwords, and the list goes on and on. Oh, and how about keeping up with all the latest attacks and keeping your data secure? The good news is Okta makes all of this a breeze! To begin, go to developer. After you create your account, click the Applications link at the top, and then click Add Application.

Enter a name for your application, such as Node Weight Tracker. Then, click Done to finish creating the application. Copy the following configuration to your.

Click on the Dashboard link at the top. Find your Org URL to the right of the page. Copy this URL and paste it into your. Description is marked as a text field and therefore has no limit on the number of characters used, but is more difficult to search. IsComplete is a boolean value that indicates if the Item is completed by the user. Use npm init to go through a wizard that will prompt up for various configuration details, including the entry point, author, name, and test scripts.

Skip these questions and use the default fields by using npm init -y. Now that Node has been initialized on your directory you can start framing out your project structure. First, create folders for config , repository , routes , server , and views. In the config folder, you will create a general configuration file named config. This will serve as the access layer to your Postgres database.

For routes you will have two routes; items. In the Server folder, create a server. Finally, add 5 views: create. The layout. The home. The file create. The login. First, you need to add express. In addition to Sequelize, you will also need the pg package, which handles Postgres:. First, create a function called initSequelize and add your initialization logic there:. This offers greater control over how Sequelize names the models in your code.

The dialect property tells Sequelize that it is using Postgres. Next, define your Item model from the database in your Node application. Model :. Back in your initSequelize function, add the full model definition for ToDoItem :.

Once you have Sequelize set up, you can implement a repository function to utilize Sequelize to perform database operations. It should look like this:. The function above provides you with common methods that modify your ToDoItems, such as update , create , delete , and findAll.

Sequelize functions take objects that can carry information for your where select options, your update options, and your where clauses. Importantly, this function will not return a list of ToDoItems , as it might appear. Sequelize is promise-based, and therefore this function will return a promise. IYou will need to allow the promise to resolve in your service layer to retrieve your true list of ToDoItems. In your two routes files users.

With your new package. If you are using npm version 5 or later, this will generate a package-lock. Then, create a server.

In the next steps, we'll look at how you can run this app inside a Docker container using the official Docker image. First, you'll need to build a Docker image of your app. The first thing we need to do is define from what image we want to build from. Here we will use the latest LTS long term support version 16 of node available from the Docker Hub :.

Next we create a directory to hold the application code inside the image, this will be the working directory for your application:. This image comes with Node. Please note that if you are using npm version 4 or earlier a package-lock. Some packages e. Package compiled on your machine and copied to the container is unlikely to work. That is why you would like to mount extra volume just for node modules. The other addition to the development configuration of docker compose is using the. It is a convenient way to manage environment variables on your local machine.

That said, you should not keep it in the repository. In production, use environment variables instead. For more information on how to configure Postgres container go to Docker Hub.

Docker Compose reads the override file by default unless said otherwise. If you are using Docker Compose on CI then explicitly specify all configuration files that apply. I do not call npm scripts directly from the command line.

They are a convenient place to encapsulate complexity and simplify start.