Loopback is a framework to create  server API's.

Loopback API servers provide information using REST API standard.

Using built-in functions like POST, PUT, PATCH and DELETE, Loopback offers a tool to make CRUD operations over  the the data saved in the Loopback application.

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Powerful tools to provide connectors to databases (local or remote).

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Loopback provides plugins to connect and interact with the most common data bases engines.

Examples: MSQL, MongoDB, MariaDB, Postgres

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API Explorer: to see the results of  our work.

API Explorer runs locally on your favorite web server and provides a tool to check the URI's made by Loopback and it is posible to check and test those methods given its parameter, if that is needed.

Support different types of data base engines.

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On this example

We are gonna use Mongo DB as a local DB to create our API server.

CLI: "Command line interface"

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This tool lets you create a loopback app:

    1. Model definition.

    2.DataSources creation.

    3. Set relationships between the models.

   4. More.

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Install the environment.

 1. Install

 Mongo DB

 (Our database).

//Import the public key used by the package management system.
$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 0C49F3730359A14518585931BC711F9BA15703C6

//Create a list file for MongoDB. Ubuntu 16.04
$ echo "deb [ arch=amd64,arm64 ] http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4 multiverse" | sudo tee /etc/apt
/sources.list.d/mongodb-org-3.4.list

//Update and Install
$ sudo apt-get update
$ sudo apt-get install -y mongodb-org


//Start Mongo DB
sudo service mongod start

//Stop Mongo DB
sudo service mongod stop

//Restart Mongo DB
sudo service mongod restar

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Install the environment.

 2. Install 

 GIT.

//Install Git using APT
    sudo apt-get update
    sudo apt-get install git
//Setting some features features
    git config --global user.name "Your Name"
    git config --global user.email "youremail@domain.com"
//Check features
    git config --list

//result will be:
    user.name=Your Name user
   .email=youremail@domain.com

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Install the environment.

 3. Install   Node.js.

//Install Git using APT
    sudo apt-get update
    sudo apt-get install git
//Setting some features features
    git config --global user.name "Your Name"
    git config --global user.email "youremail@domain.com"
//Check features
    git config --list

//result will be:
    user.name=Your Name user
   .email=youremail@domain.com

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Install the environment.

 4. Install  Loopback.

//Install Loopback
     $ npm install -g loopback-cli
//Init the app
     $ lb
//Set a project name
     ? What's the name of your application? hello-world
     ? Enter name of the directory to contain the project: hello-world
//Set a version
     ? Which version of LoopBack would you like to use? 3.x (current)
     ? What kind of application do you have in mind? api-aerver 
     ...
     I'm all done. Running npm install for you to install the required dependencies.
     If this fails, try running the command yourself.

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Loopback

 5. Set the  datasource.

LoopBack data sources represent backend systems such as databases, external REST APIs, SOAP web services, and storage services. Data sources provide create, retrieve, update, and delete (CRUD) functions through the DataSource and PersistedModel APIs.

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LoopBack

 5.1  Loopback:  Setting a model

Setting a Person model  that extends the Loopback built-in User model.

Properties:  Phone Number, Address, Country, Complete name.

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Install the environment.

 6.  Loopback:  Setting a model  Product and its  relation

Setting a Person model  that extends the Loopback built-in User model.

Properties:  Phone Number, Address, Country, Complete name.

Now we will set the relationship Person has many Products.

The result: The web api sever will provide URI's to manage the Products related to one Person

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Loopback Usage

 1. Create Persona

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Loopback Usage

 2. Edit data using  loopback API  explorer.

This  example will edit a Persona instance, this Object extends User Object so it is needed to provide a token to edit the personal information.

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Loopback Usage

 3. CRUD Products

This example will show the CRUD operations over a Product model. It will describe filtering examples when fetch Products is needed.

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Loopback Usage

 4. ACL

 This example will set a business rule: Only logged user can access to the products

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Loopback Usage

 5. Data control

This example will show how to check the length of a address. if it less than 3 characters, reject then reject the post.