first commit
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commit
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# Logs
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logs
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*.log
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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# Runtime data
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pids
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*.pid
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*.seed
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*.pid.lock
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# Directory for instrumented libs generated by jscoverage/JSCover
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lib-cov
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# Coverage directory used by tools like istanbul
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coverage
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# nyc test coverage
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.nyc_output
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# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
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.grunt
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# Bower dependency directory (https://bower.io/)
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bower_components
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# node-waf configuration
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.lock-wscript
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# Compiled binary addons (https://nodejs.org/api/addons.html)
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build/Release
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# Dependency directories
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node_modules/
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jspm_packages/
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# TypeScript v1 declaration files
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typings/
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# Optional npm cache directory
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.npm
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# Optional eslint cache
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.eslintcache
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# Optional REPL history
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.node_repl_history
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# Output of 'npm pack'
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*.tgz
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# Yarn Integrity file
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.yarn-integrity
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# VS Code settings
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.vscode
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# start
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By creating a new web app that you will call Dijkstra, I would like you to:
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- Find a DB modelization that allows you to store any country given its cities and its roads between them (see Belgian graph);
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- Store the Belgian data (see belgium.rb);
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- Allow a user to select Belgium as a country (or if he/she navigates to /countries/belgium), then allow to select a starting point (a Belgian city) and a destination (also a Belgian city);
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- Once the user has selected the starting point and the destination, tell the shortest distance between those two cities;
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- Describe to the user the path (for example: Bruges -> Ghent -> Brussels -> Liège) that corresponds to the shortest distance you returned to the user;
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- Make your code shines!
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# end
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const express = require("express");
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// const authRouter = require('../services/auth/authRouter');
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// const usersRouter = require('../services/users/usersRouter');
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// const sessionsRouter = require('../services/sessions/sessionsRouter');
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// const dailyAveragesRouter = require('../services/dailyAverages/dailyAveragesRouter');
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const server = express();
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server.use(express.json());
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// server.use('/api/auth', authRouter);
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// server.use('/api/users', authenticate, usersRouter);
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// server.use('/api/users', authenticate, sessionsRouter);
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// server.use('/api/users', authenticate, dailyAveragesRouter);
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module.exports = server;
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const knex = require('knex');
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const config = require('../knexfile');
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const environment = 'development';
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module.exports = knex(config[environment]);
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exports.up = function(knex, Promise) {
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return knex.schema.createTable('countries', function(countries) {
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countries.increments();
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countries
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.string('name', 128)
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.notNullable()
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.unique();
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});
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};
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exports.down = function(knex, Promise) {
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return knex.schema.dropTableIfExists('countries');
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};
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exports.up = function(knex) {
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return knex.schema.createTable('cities', function(cities) {
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cities.increments();
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cities.string('name', 128).notNullable();
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cities
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.integer('country_id')
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.unsigned()
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.notNullable()
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.references('id')
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.inTable('countries')
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.onDelete('CASCADE')
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.onUpdate('CASCADE');
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});
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};
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exports.down = function(knex) {
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return knex.schema.dropTableIfExists('cities');
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};
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exports.up = function(knex) {
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return knex.schema.createTable('roads', function(roads) {
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roads.increments();
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roads
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.integer('start_city_id')
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.unsigned()
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.notNullable()
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.references('id')
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.inTable('cities')
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.onDelete('CASCADE')
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.onUpdate('CASCADE');
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roads
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.integer('end_city_id')
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.unsigned()
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.notNullable()
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.references('id')
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.inTable('cities')
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.onDelete('CASCADE')
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.onUpdate('CASCADE');
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roads
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.integer('distance')
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.unsigned()
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.notNullable()
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});
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};
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exports.down = function(knex) {
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return knex.schema.dropTableIfExists('roads');
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};
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exports.seed = function(knex) {
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return knex('countries').truncate()
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.then(function () {
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return knex('countries').insert([
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{
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id: 1,
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name: 'Belgium',
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}
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]);
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});
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};
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exports.seed = function(knex) {
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return knex('cities').truncate()
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.then(function () {
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return knex('cities').insert([
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{
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"id": 1,
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"name": 'bruges',
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"country_id": 1
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},
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{
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"id": 2,
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"name": 'antwerp',
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"country_id": 1
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},
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{
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"id": 3,
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"name": 'ghent',
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"country_id": 1
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},
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{
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"id": 4,
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"name": 'mechelen',
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"country_id": 1
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},
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{
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"id": 5,
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"name": 'brussels',
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"country_id": 1
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},
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{
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"id": 6,
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"name": 'mons',
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"country_id": 1
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},
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{
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"id": 7,
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"name": 'namur',
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"country_id": 1
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},
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{
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"id": 8,
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"name": 'liege',
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"country_id": 1
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},
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{
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"id": 9,
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"name": 'arlon',
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"country_id": 1
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},
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{
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"id": 10,
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"name": 'tournai',
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"country_id": 1
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},
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]);
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});
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};
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exports.seed = function(knex) {
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return knex('roads').truncate()
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.then(function () {
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return knex('roads').insert([
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{
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"id": 1,
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"start_city_id": 1,
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"end_city_id": 3,
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"distance": 50
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},
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{
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"id": 2,
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"start_city_id": 3,
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"end_city_id": 10,
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"distance": 80
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},
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{
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"id": 3,
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"start_city_id": 10,
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"end_city_id": 5,
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"distance": 89
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},
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{
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"id": 4,
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"start_city_id": 3,
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"end_city_id": 5,
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"distance": 56
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},
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{
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"id": 5,
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"start_city_id": 3,
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"end_city_id": 2,
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"distance": 60
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},
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{
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"id": 6,
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"start_city_id": 2,
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"end_city_id": 4,
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"distance": 25
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},
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{
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"id": 7,
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"start_city_id": 4,
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"end_city_id": 5,
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"distance": 27
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},
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{
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"id": 8,
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"start_city_id": 5,
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"end_city_id": 6,
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"distance": 80
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},
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{
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"id": 9,
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"start_city_id": 6,
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"end_city_id": 7,
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"distance": 91
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},
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{
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"id": 10,
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"start_city_id": 6,
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"end_city_id": 10,
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"distance": 51
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},
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{
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"id": 11,
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"start_city_id": 7,
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"end_city_id": 9,
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"distance": 129
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},
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{
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"id": 12,
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"start_city_id": 9,
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"end_city_id": 7,
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"distance": 123
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},
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{
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"id": 13,
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"start_city_id": 8,
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"end_city_id": 7,
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"distance": 65
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},
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{
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"id": 14,
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"start_city_id": 8,
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"end_city_id": 5,
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"distance": 97
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}
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]);
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});
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};
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const server = require("./api/server");
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server.get("/", (req, res) => {
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res.json({
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message: `API server for Dijkstra. :)`,
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documentation: `Coming`
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});
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});
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const PORT = process.env.PORT || 4000;
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server.listen(PORT, () => {
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console.log(`Listening on port ${PORT}...`);
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});
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module.exports = {
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development: {
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client: 'sqlite3',
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connection: {
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filename: './data/database_file.db3',
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},
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useNullAsDefault: true,
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migrations: {
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directory: './data/migrations'
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},
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seeds: {
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directory: './data/seeds'
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},
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pool: {
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afterCreate: (conn, done) => {
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// runs after a connection is made to the sqlite engine
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conn.run('PRAGMA foreign_keys = ON', done); // turn on FK enforcement
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},
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},
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}
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};
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const db = require('../data/dbConfig');
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module.exports = {
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getCountries,
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getCountryByName,
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};
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function getCountries() {
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return db('countries')
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}
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function getCountryByName(name) {
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return db('countries')
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.where({ name })
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.first()
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}
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Load Diff
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{
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"name": "dijkstra",
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"version": "1.0.0",
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"description": "",
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"main": "index.js",
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"dependencies": {
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"express": "^4.17.1",
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"knex": "^0.20.8",
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"nodejs": "^0.0.0",
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"sqlite3": "^4.1.1"
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},
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"devDependencies": {},
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"scripts": {
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"test": "test",
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"start": "node index.js"
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},
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"author": "",
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"license": "ISC"
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||||
}
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