first commit

data/dbConfig.js

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+
+const knex = require('knex');
+const config = require('../knexfile');
+
+const environment = 'development';
+
+module.exports = knex(config[environment]);

data/migrations/20200207155645_countries.js

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+exports.up = function(knex, Promise) {
+    return knex.schema.createTable('countries', function(countries) {
+      countries.increments();
+      countries
+        .string('name', 128)
+        .notNullable()
+        .unique();
+    });
+  };
+  
+  exports.down = function(knex, Promise) {
+    return knex.schema.dropTableIfExists('countries');
+  };

data/migrations/20200207160031_cities.js

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+exports.up = function(knex) {
+    return knex.schema.createTable('cities', function(cities) {
+      cities.increments();
+
+      cities.string('name', 128).notNullable();
+      cities
+        .integer('country_id')
+        .unsigned()
+        .notNullable()
+        .references('id')
+        .inTable('countries')
+        .onDelete('CASCADE')
+        .onUpdate('CASCADE');
+    });
+  };
+  
+  exports.down = function(knex) {
+    return knex.schema.dropTableIfExists('cities');
+  };
+  

data/migrations/20200207160304_roads.js

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+exports.up = function(knex) {
+    return knex.schema.createTable('roads', function(roads) {
+        roads.increments();
+
+        roads
+            .integer('start_city_id')
+            .unsigned()
+            .notNullable()
+            .references('id')
+            .inTable('cities')
+            .onDelete('CASCADE')
+            .onUpdate('CASCADE');
+
+        roads
+            .integer('end_city_id')
+            .unsigned()
+            .notNullable()
+            .references('id')
+            .inTable('cities')
+            .onDelete('CASCADE')
+            .onUpdate('CASCADE');
+
+        roads
+            .integer('distance')
+            .unsigned()
+            .notNullable()
+    });
+};
+
+exports.down = function(knex) {
+    return knex.schema.dropTableIfExists('roads');
+};

data/seeds/01-countries.js

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+
+exports.seed = function(knex) {
+	return knex('countries').truncate()
+		.then(function () {
+			return knex('countries').insert([
+				{
+					id: 1,
+					name: 'Belgium',
+				}
+			]);
+	});
+};

data/seeds/02-cities.js

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+
+exports.seed = function(knex) {
+	return knex('cities').truncate()
+		.then(function () {
+			return knex('cities').insert([
+				{
+					"id": 1,
+					"name": 'bruges',
+					"country_id": 1
+        },
+        {
+					"id": 2,
+					"name": 'antwerp',
+					"country_id": 1
+        },
+        {
+					"id": 3,
+					"name": 'ghent',
+					"country_id": 1
+        },
+        {
+					"id": 4,
+					"name": 'mechelen',
+					"country_id": 1
+        },
+        {
+					"id": 5,
+					"name": 'brussels',
+					"country_id": 1
+        },
+        {
+					"id": 6,
+					"name": 'mons',
+					"country_id": 1
+        },
+        {
+					"id": 7,
+					"name": 'namur',
+					"country_id": 1
+        },
+        {
+					"id": 8,
+					"name": 'liege',
+					"country_id": 1
+        },
+        {
+					"id": 9,
+					"name": 'arlon',
+					"country_id": 1
+        },
+        {
+					"id": 10,
+					"name": 'tournai',
+					"country_id": 1
+        },
+        
+			]);
+	});
+};

data/seeds/03-roads.js

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+
+exports.seed = function(knex) {
+	return knex('roads').truncate()
+		.then(function () {
+			return knex('roads').insert([
+				{
+					"id": 1,
+					"start_city_id": 1,
+          "end_city_id": 3,
+          "distance": 50
+        },
+        {
+					"id": 2,
+					"start_city_id": 3,
+          "end_city_id": 10,
+          "distance": 80
+        },
+        {
+					"id": 3,
+					"start_city_id": 10,
+          "end_city_id": 5,
+          "distance": 89
+        },
+        {
+					"id": 4,
+					"start_city_id": 3,
+          "end_city_id": 5,
+          "distance": 56
+        },
+        {
+					"id": 5,
+					"start_city_id": 3,
+          "end_city_id": 2,
+          "distance": 60
+        },
+        {
+					"id": 6,
+					"start_city_id": 2,
+          "end_city_id": 4,
+          "distance": 25
+        },
+        {
+					"id": 7,
+					"start_city_id": 4,
+          "end_city_id": 5,
+          "distance": 27
+        },
+        {
+					"id": 8,
+					"start_city_id": 5,
+          "end_city_id": 6,
+          "distance": 80
+        },
+        {
+					"id": 9,
+					"start_city_id": 6,
+          "end_city_id": 7,
+          "distance": 91
+        },
+        {
+					"id": 10,
+					"start_city_id": 6,
+          "end_city_id": 10,
+          "distance": 51
+        },
+        {
+					"id": 11,
+					"start_city_id": 7,
+          "end_city_id": 9,
+          "distance": 129
+        },
+        {
+					"id": 12,
+					"start_city_id": 9,
+          "end_city_id": 7,
+          "distance": 123
+        },
+        {
+					"id": 13,
+					"start_city_id": 8,
+          "end_city_id": 7,
+          "distance": 65
+        },
+        {
+					"id": 14,
+					"start_city_id": 8,
+          "end_city_id": 5,
+          "distance": 97
+        }
+			]);
+	});
+};