Switch from Knex to TypeORM. Update Knub.

src/data/BaseRepository.ts

@@ -0,0 +1,50 @@
+export class BaseRepository {
+  private static guildInstances: Map<string, any>;
+  private nextRelations: string[];
+
+  protected guildId: string;
+
+  constructor(guildId: string) {
+    this.guildId = guildId;
+    this.nextRelations = [];
+  }
+
+  /**
+   * Returns a cached instance of the inheriting class for the specified guildId,
+   * or creates a new instance if one doesn't exist yet
+   */
+  public static getInstance<T extends typeof BaseRepository>(this: T, guildId: string): InstanceType<T> {
+    if (!this.guildInstances) {
+      this.guildInstances = new Map();
+    }
+
+    if (!this.guildInstances.has(guildId)) {
+      this.guildInstances.set(guildId, new this(guildId));
+    }
+
+    return this.guildInstances.get(guildId) as InstanceType<T>;
+  }
+
+  /**
+   * Primes the specified relation(s) to be used in the next database operation.
+   * Can be chained.
+   */
+  public with(relations: string | string[]): this {
+    if (Array.isArray(relations)) {
+      this.nextRelations.push(...relations);
+    } else {
+      this.nextRelations.push(relations);
+    }
+
+    return this;
+  }
+
+  /**
+   * Gets and resets the relations primed using with()
+   */
+  protected getRelations(): string[] {
+    const relations = this.nextRelations || [];
+    this.nextRelations = [];
+    return relations;
+  }
+}