UserManager => Add get by id functions

ExpressAPI/src/managers/UserManager.ts

@@ -34,6 +34,16 @@ class UserManager {
     async getByIds(ids: Array<number>): Promise<Array<User>> {
         return Promise.all(ids.map(userId => this.getById(userId)));
     }
+
+    async getByGitlabId(gitlabId: number): Promise<User | undefined> {
+        const raw = await db<User>(User.tableName).where('userGitlabId', gitlabId).first();
+
+        return raw ? this.createObjectFromRawSql(raw) : undefined;
+    }
+
+    async getByGitlabIds(gitlabIds: Array<number>): Promise<Array<User>> {
+        return Promise.all(gitlabIds.map(gitlabId => this.getByGitlabId(gitlabId)));
+    }
 }