Working(tm) implementation of group and team deletion

ref #13

src/models/entities/RunnerGroup.ts

@@ -1,13 +1,12 @@
-import { PrimaryGeneratedColumn, Column, OneToMany, ManyToOne, Entity, TableInheritance } from "typeorm";
 import {
   IsInt,
   IsNotEmpty,
   IsOptional,
-  IsString,
+  IsString
 } from "class-validator";
+import { Column, Entity, ManyToOne, OneToMany, PrimaryGeneratedColumn, TableInheritance } from "typeorm";
 import { GroupContact } from "./GroupContact";
 import { Runner } from "./Runner";
-import { RunnerTeam } from "./RunnerTeam";
 
 /**
  * Defines the runnerGroup interface.
@@ -44,4 +43,6 @@ export abstract class RunnerGroup {
    */
   @OneToMany(() => Runner, runner => runner.group, { nullable: true })
   runners: Runner[];
+
+  public abstract getRunners();
 }