From acff469ba069b6f090adfd5ed91379c9f146aa77 Mon Sep 17 00:00:00 2001
From: Logan Hunt <loganhunt@simponic.xyz>
Date: Wed, 30 Mar 2022 15:18:16 -0600
Subject: Ability to add, remove, update radius and location of chatrooms with
 a leaflet

---
 .../migrations/1648605030863-AddChatRoom.ts        | 20 +++++++---
 .../1648669551959-AddDistanceFunction.ts           | 45 ++++++++++++++++++++++
 2 files changed, 60 insertions(+), 5 deletions(-)
 create mode 100644 server/database/migrations/1648669551959-AddDistanceFunction.ts

(limited to 'server/database/migrations')

diff --git a/server/database/migrations/1648605030863-AddChatRoom.ts b/server/database/migrations/1648605030863-AddChatRoom.ts
index d8eed52..e4b5ca9 100644
--- a/server/database/migrations/1648605030863-AddChatRoom.ts
+++ b/server/database/migrations/1648605030863-AddChatRoom.ts
@@ -1,10 +1,10 @@
-import { MigrationInterface, QueryRunner, Table } from 'typeorm';
+import { MigrationInterface, QueryRunner, Table, TableForeignKey } from 'typeorm';
 
 export class AddChatRoom1648605030863 implements MigrationInterface {
   public async up(queryRunner: QueryRunner): Promise<void> {
     await queryRunner.createTable(
       new Table({
-        name: 'chatroom',
+        name: 'chat_room',
         columns: [
           {
             name: 'id',
@@ -13,8 +13,8 @@ export class AddChatRoom1648605030863 implements MigrationInterface {
             isGenerated: true,
           },
           {
-            name: 'name',
-            type: 'text',
+            name: 'userId',
+            type: 'int',
             isNullable: false,
           },
           {
@@ -35,9 +35,19 @@ export class AddChatRoom1648605030863 implements MigrationInterface {
         ],
       }),
     );
+
+    await queryRunner.createForeignKey(
+      'chat_room',
+      new TableForeignKey({
+        columnNames: ['userId'],
+        referencedColumnNames: ['id'],
+        referencedTableName: 'user',
+        onDelete: 'CASCADE',
+      }),
+    );
   }
 
   public async down(queryRunner: QueryRunner): Promise<void> {
-    await queryRunner.dropTable('chatroom');
+    await queryRunner.dropTable('chat_room');
   }
 }
diff --git a/server/database/migrations/1648669551959-AddDistanceFunction.ts b/server/database/migrations/1648669551959-AddDistanceFunction.ts
new file mode 100644
index 0000000..0890936
--- /dev/null
+++ b/server/database/migrations/1648669551959-AddDistanceFunction.ts
@@ -0,0 +1,45 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class AddDistanceFunction1648669551959 implements MigrationInterface {
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    // From https://stackoverflow.com/questions/61135374/postgresql-calculate-distance-between-two-points-without-using-postgis
+    await queryRunner.query(`
+CREATE OR REPLACE FUNCTION calculate_distance(lat1 float, lon1 float, lat2 float, lon2 float, units varchar)
+  RETURNS float AS $dist$
+      DECLARE
+          dist float = 0;
+          radlat1 float;
+          radlat2 float;
+          theta float;
+          radtheta float;
+      BEGIN
+          IF lat1 = lat2 OR lon1 = lon2
+              THEN RETURN dist;
+          ELSE
+              radlat1 = pi() * lat1 / 180;
+              radlat2 = pi() * lat2 / 180;
+              theta = lon1 - lon2;
+              radtheta = pi() * theta / 180;
+              dist = sin(radlat1) * sin(radlat2) + cos(radlat1) * cos(radlat2) * cos(radtheta);
+  
+              IF dist > 1 THEN dist = 1; END IF;
+  
+              dist = acos(dist);
+              dist = dist * 180 / pi();
+              dist = dist * 60 * 1.1515;
+  
+              IF units = 'K' THEN dist = dist * 1.609344; END IF;
+              IF units = 'N' THEN dist = dist * 0.8684; END IF;
+  
+              RETURN dist;
+          END IF;
+      END;
+  $dist$ LANGUAGE plpgsql;`);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `DROP FUNCTION IF EXISTS calculate_distance(lat1 float, lon1 float, lat2 float, lon2 float, units varchar);`,
+    );
+  }
+}
-- 
cgit v1.2.3-70-g09d2