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Welcome to Crystal Spark dev exercise 🥳

Setup

Prerequisites for this exercise:

  • Make sure you have a working PHP7 or PHP8 local environment with composer
  • Make sure you have a local Typescript running environement
  • Make sure you have local MySQL database

Clone this project.

Make a copy of .env.example and rename it .env modify the field to give access to your database:

DB_PORT=3306
DB_DATABASE=sandra
DB_USERNAME=root
DB_PASSWORD=

Then run:

composer update

then:

php artisan test:start

This will create or empty the required table and add data. Take a look at the file

app/Console/Commands/Game.php

You will see a datagraph initialized with some data: take a look at the code to understand relations created.

This is an overlook of the tables generated and the data structure:

Copy the folder app/yourNameExercise and rename it with your name. Then modify the file for the exercises: this file will contain all needed work and will be used for us to debrief together on the test outcome.

Part I: SQL

Exercice 1

Write an SQL query returning testgame_SandraTriplets table with instead concepts id foreign keys in testgame_SandraConcept, the column "shortname" of the concept IF exists otherwise the column "code". See the following image as expected result

Exercice 2

From previous query, filter in order NOT to display any annoying insect related triplet

Interlude: A bit about Laravel

If you are not familiar with laravel and you would like to just run your code, you can use the console command file at app/Console/Commands/TestGameExecute.php and run it through the console by doing

php artisan testgame:execute

You can simply modify the class used to point to your own class namespace:

namespace App\Console\Commands;
use App\yourNameExercise\MainExercises; //modify
use Illuminate\Console\Command;

Part II: PHP

We are going to use the library SandraCore to make some data queries on the datagraph. The goal is to display country and city names in a preferred language.

We are going to "simply" display all the cities with their respective country. The catch is some cities and country names are localized in certain languages. By default we display the name in english. If a specific language is defined we display the name in the defined language if available if not we display english localization or the default name.

Exercice 3

Write a script that will return an array of strings of all the cities with their respective countries

Array
(
    [0] => London - United Kingdom
    [1] => Delhi - India
    [2] => Paris - France
    [3] => Prague - Czech Republic
    [4] => Geneva - Switzerland
    [5] => Zurich - Switzerland
)

Exercice 4

This time same as previous exercise, but we pass an entity for favorite language. It could be a person, a city or a country. If a person can be defined directly as speak - language but if not we are looking if the person is born in a certain city. Then the city might speak a language. If the city language is not defined then we look at the city's country language.

Hint

For this exercice you might need to access the factory of an existing entity. For example to join a factory to the parent factory. For this you can just access the factory from an entity by doing

$entity->factory->joinFactory($verb,$factoryToJoin)

Part III: Typescript

Bonus Exercise 5

Create a front end application allowing to list the content of localized file and allow to modify or add new translations for cities and countries. It should be also possible to add new language. We should be able to define new relations for a person a city or a country the same way we do via code

$kurt->setBrotherEntity('speak','german',array());

For this exercises you can use Laravel routes controller as API. you can launch an API server with:

php artisan serve

It will create a server http://127.0.0.1:8000 where you can create GET and POST requests.