How to filter queryset on the LearnerQuestionAnswer Model?

Question

I have a model named Quiz. Each Quiz has a set of related questions in the model Quiz_Question.

Quiz Model:-

class Quiz(models.Model):
    quiz_name = models.CharField(max_length=200)

Quiz_Question Model:-

class Quiz_Question(models.Model):
    quiz = models.ForeignKey(Quiz, related_name='questions')
    text = models.CharField(max_length=200)

Now I can get all the questions for a particular quiz using the related_name attribute as follows:-

all_quizes = Quiz.objects.all()

A particular quiz:-

quiz = all_quizes[0]

All the questions related to this quiz as follows:-

all_related_questions = quiz.questions.all()

I have another model as a LearnerQuestionAnswer where learner is a normal django user:-

class LearnerQuestionAnswer(models.Model):
    quiz_question = models.ForeignKey(Quiz_Question)
    learner = models.ForeignKey(User)

I can filter out the quiz and learner specific questions on the Quiz_Question Model like this:-

quiz = all_quizes[0]
learner= User.objects.get(id=1)
Quiz_Question.objects.filter(quiz=quiz, learnerquestionanswer__learner=learner)

How can I filter out similarly on the LearnerQuestionAnswer Model so that I can get quiz and learner specific queryset just like the above one?

Answer 1

You can use quiz_question__quiz lookup to filter by quize. Use following query to query by quiz and learner:

quiz = all_quizes[0]
learner= User.objects.get(id=1)
LearnerQuestionAnswer.objects.filter(quiz_question__quiz=quiz, learner=learner)

Check this part of the doc about filter by related model's fields.