feat(backend): Question- en AnswerRepository aangemaakt.

Ook functie toegevoegd om submissies te verwijderen.

backend/src/data/questions/answer-repository.ts

@@ -0,0 +1,26 @@
+import {DwengoEntityRepository} from "../dwengo-entity-repository";
+import {Answer} from "../../entities/questions/answer.entity";
+import {Question} from "../../entities/questions/question.entity";
+import {Teacher} from "../../entities/users/teacher.entity";
+
+export class AnswerRepository extends DwengoEntityRepository<Answer> {
+    public createAnswer(answer: {toQuestion: Question, author: Teacher, content: string}): Promise<Answer> {
+        let answerEntity = new Answer();
+        answerEntity.toQuestion = answer.toQuestion;
+        answerEntity.author = answer.author;
+        answerEntity.content = answer.content;
+        return this.insert(answerEntity);
+    }
+    public findAllAnswersToQuestion(question: Question): Promise<Answer[]> {
+        return this.findAll({
+            where: { toQuestion: question },
+            orderBy: { sequenceNumber: "ASC" }
+        });
+    }
+    public removeAnswerByQuestionAndSequenceNumber(question: Question, sequenceNumber: number): Promise<void> {
+        return this.deleteWhere({
+            toQuestion: question,
+            sequenceNumber: sequenceNumber
+        });
+    }
+}