There is no property X in type Y[]

Encountered an issue:

Error message - questions does not exist on type 'Quiz[]'

A look at my model

export interface Quiz {
$key ?: string;
categorie ?: string;

questions : Questions[]
}

export interface Questions {

id ?: number;
question ?: string;
answer?: string;

}

Here's the code snippet in question

import {Quiz} from "../models/quiz";

export class ProfComponent {

quiz = [] as  Quiz[];


nextQuestion(quiz) {

    this.quiz.questions.push(quiz.questions)
}


}

Issue faced while pushing data into quiz.questions

Seeking insights on potential errors here.

angulartypescript

Answer №1

By defining the quiz property as an array using Quiz[], you must access the items of the array in order to reach the questions property.

If your intention is to simply redefine the property as Quiz...

Furthermore, remember to initialize the questions array before using the push method on it.

import {Quiz} from "../models/quiz";

export class ProfComponent {

  quiz = {questions: []} as Quiz;

  nextQuestion(quiz) {
    this.quiz.questions.push(quiz.questions)
  }

}

Alternatively, if you want to store multiple quizzes in an array:

import {Quiz} from "../models/quiz";

export class ProfComponent {

  quizes = [{questions: []}] as Quiz[]; // array of Quiz objects

  nextQuestion(quiz) {
    this.quizes[0].questions.push(quiz.questions); // accessing the first quiz
  }

}

Answer №2

One must first initialize the array before pushing any values into it.

moveForward(quiz) {
     this.quiz.questions = [];
    this.quiz.questions.push(quiz.questions);
}

Answer №3

Whether

newQuiz = createNewQuiz();

or

this.newQuiz[0].questions.push(newQuiz.questions)

When initializing newQuiz as an array, be sure to specify the array entry to access a proper Quiz, or simply avoid making it an array if that is not the desired outcome.

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