Transferring intricate data from Blade to Vue layers

Question

Transferring intricate data from Blade to Vue layers

In my Laravel application, I have three models: Lesson, Quiz, and Answer (which should have been named Option). The relationships are set up so that each Lesson has Quizzes, and each Quiz has Answers. In a Blade file, I have access to a $lesson instance. My goal is to send both $lesson->quizzes and $quiz->answers from Blade to a VueJS method. Currently, I am only able to send the quizzes:

<modal-button color="success" size="small" icon="eye" header="View Quiz" btntxt="View Quiz" @showmodal="onShowViewQuizModal({{ $lesson->quizzes }})">
@include('partials.quizform')
</modal-button>

I receive the sent quizzes in my VueJS method and assign the array of objects to a VueJS data property:

onShowViewQuizModal(quizzes){
    this.quizzes = quizzes;
}

Within the quizform partial, I am attempting to display this nested data structure. My idea for accomplishing this is as follows:

<div v-for="quiz in quizzes">
    <p>@{{ quiz.title }}</p>

    <div v-for="answer in quiz.answers">
        <p>@{{ answer.title }}</p>
    </div>
</div>

Currently, only the outer v-for loop works, while the inner v-for loop does not because quiz.answers is likely undefined.

I hope you understand the issue, as it's common and many may have encountered it before. What would be the best way to handle this situation?

javascript laravel vue.js laravel-blade

Answer 1

Answer №1

To establish a connection in your Quiz model, create the following relationship:

public function responses()
{
    return $this->hasMany('App\Answer'); // You can specify the foreign key as the second parameter
}

In your Laravel Controller method, use something similar to this:

return Quiz::with('responses')->get();

Your VueJS will handle everything else seamlessly.

Answer 2

To establish a connection in your Quiz model, create the following relationship:

public function responses()
{
    return $this->hasMany('App\Answer'); // You can specify the foreign key as the second parameter
}

In your Laravel Controller method, use something similar to this:

return Quiz::with('responses')->get();

Your VueJS will handle everything else seamlessly.

Answer 3

Answer №2

It would be best to handle this before the view is displayed, but here's a possible solution.

<div v-for="quiz in quizzes">
    <p>@{{ quiz.title }}</p>
    <div v-if="quiz.answers">
      <div v-for="answer in quiz.answers">
          <p>@{{ answer.title }}</p>
      </div>
    </div>
</div>

If you need to add a property to an object that doesn't exist, you can try this approach.

for(x in quizzes){
  if(!x.hasOwnProperty('answers')){
    quizzes.x['answers] = []; <-- could use {} for object, depends what you're using for the answers when they exist
  }
}

Then update your code like so:

<div v-for="quiz in quizzes">
    <p>@{{ quiz.title }}</p>
    <div v-if="quiz.answers && quiz.answers.length > 0">
      <div v-for="answer in quiz.answers">
          <p>@{{ answer.title }}</p>
      </div>
    </div>
</div>

If answers is an object, you can check its length and constructor like this:

Object.keys(quiz.answers).length === 0 && quiz.answers.constructor === Object

Answer 4

It would be best to handle this before the view is displayed, but here's a possible solution.

<div v-for="quiz in quizzes">
    <p>@{{ quiz.title }}</p>
    <div v-if="quiz.answers">
      <div v-for="answer in quiz.answers">
          <p>@{{ answer.title }}</p>
      </div>
    </div>
</div>

If you need to add a property to an object that doesn't exist, you can try this approach.

for(x in quizzes){
  if(!x.hasOwnProperty('answers')){
    quizzes.x['answers] = []; <-- could use {} for object, depends what you're using for the answers when they exist
  }
}

Then update your code like so:

<div v-for="quiz in quizzes">
    <p>@{{ quiz.title }}</p>
    <div v-if="quiz.answers && quiz.answers.length > 0">
      <div v-for="answer in quiz.answers">
          <p>@{{ answer.title }}</p>
      </div>
    </div>
</div>

If answers is an object, you can check its length and constructor like this:

Object.keys(quiz.answers).length === 0 && quiz.answers.constructor === Object

Transferring intricate data from Blade to Vue layers

Answer №1

Answer №2

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