Django：从模型创建JSON对象返回模板

Question

我正在研究一个基于Django的测验，它将在Javascript的帮助下呈现。每个测验包含许多问题，基本上有一个问题文本和一些选择（反过来可以是正确的或不正确的 - 理论上可以有多个正确的答案）。

我想从模板调用get_all_questions_json到然后接收这样的事情：

{ 
    { 
     "Question 1": 
     [ 
      ["Answer 1-1", true], 
      ["Answer 1-2", false], 
      ["Answer 1-3", false] 
     ] 
    }, 

    { 
     "Question 2": 
     [ 
      ["Answer 1-1", false], 
      ["Answer 1-2", true], 
      ["Answer 1-3", false] 
     ] 
    }, 

    { 
     "Question 3": 
     [ 
      ["Answer 1-1", false], 
      ["Answer 1-2", false], 
      ["Answer 1-3", true] 
     ] 
    } 
} 

我怎样才能做到这一点？

models.py：

class Quiz(models.Model): 
    name = models.CharField(max_length=80) 
    slug = models.SlugField() 
    # to do feedback texts 

    class Meta: 
     verbose_name_plural = "Quizzes" 

    def save(self, *args, **kwargs): 
     if not self.id: 
      # Newly created object, set slug 
      self.slug = slugify(self.name) 
     super(Quiz, self).save(*args, **kwargs) 

    def __str__(self): 
     return self.name 

    def get_all_questions(self): 
     return self.question_set.all() 

    def get_all_questions_json(self): 
     # 

class Question(models.Model): 
    quiz = models.ForeignKey(Quiz, on_delete=models.CASCADE) 
    text = models.CharField(max_length=200) 
    image = models.ImageField() 

    def __str__(self): 
     return self.text 


class Choice(models.Model): 
    question = models.ForeignKey(Question, on_delete=models.CASCADE) 
    text = models.CharField(max_length=80) 
    iscorrect = models.BooleanField() 

    def __str__(self): 
     return self.text 

Answer 1

您可以通过在你的目标测验的问题进行迭代，并创建一个你以后可以传递给json.dumps列表。

def get_all_questions_json(self): 
    import json 
    quiz_data = [] 
    for question in self.question_set.all(): 
     answers = [] 
     quiz_data.append({ 
      'text': question.text, 
      'answers': [ 
       [answer.text, answer.is_correct] 
       for answer in question.answer_set.all() 
      ], 
     }) 
    return json.dumps(quiz_data) 

输出将是你说什么有一点不同，是这样的：

[ 
    { 
     text: "Question 1", 
     answers: [ 
      ["Answer 1-1", true], 
      ["Answer 1-2", false], 
      ["Answer 1-3", false] 
     ] 
    }, 
    { 
     text: "Question 2", 
     answers: [ 
      ["Answer 1-1", false], 
      ["Answer 1-2", true], 
      ["Answer 1-3", false] 
     ] 
    }, 
    { 
     text: "Question 3", 
     answers: [ 
      ["Answer 1-1", false], 
      ["Answer 1-2", false], 
      ["Answer 1-3", true] 
     ] 
    } 
]