Django On-Insert 触发器

Question

我在 Django 中有一个模型，我希望在另一个模型插入对象后自动填充值。 这是发起者模型问题：

class Question(models.Model):
question = models.CharField(max_length=200, null=False, blank=False)
description = models.TextField('description', default=False)
voters = models.ManyToManyField(User, related_name='+')
votes = models.IntegerField(default = 0)
created_by = models.ForeignKey(User, on_delete=models.CASCADE)

问题视图：

class QuestionApiView(AuthenticatedAPIView):
"""
Lists all questions or creates a new question
"""

def post(self, request, format=None):

    vote_data = request.data
    vote_data["created_by"] = request.user.id

    data["created_by"]=request.user.id

    print(vote_data)
    print(vote_data["voters"])
    voter_data = vote_data["voters"]

    result, valid = QuestionHelper.createQuestion(vote_data)

问题助手：

class QuestionHelper(object):
@classmethod
def createQuestion(klass, questiondata):
    """
    creates a question
    """
    createdQuestion = QuestionSerializer(data=questiondata)
    if createdQuestion.is_valid():
        createdQuestion.save()
        return createdQuestion.data, True
    return createdQuestion.errors, False

问题序列化器：

class QuestionSerializer(serializers.ModelSerializer):
    class Meta:
        model = Question
        fields = '__all__'

这是我的 Choice 模型，我希望将值 Yes、No 和 Abstain 添加到 >choice_text 一旦创建了 Question 对象：

question = models.ForeignKey(Question, on_delete=models.CASCADE, default=1)
choice_text = models.CharField("choice", max_length=250)

这样，每个选项都将使用 question_id 链接到一个问题

Answer 1

这是一个使用选项的示例：

models.py

YES = 0
NO = 1
ABSTAIN = 2

CHOICE_OPTIONS = (
    (YES, 'yes'),
    (NO, 'no'),
    (ABSTAIN, 'abstain'),
)

class Question(models.Model):
    choice = models.PositiveIntegerField(..., choices = CHOICE_OPTIONS)

views.py

from . import models

# update a choice instance:
question = models.Question.objects.get(id='<the id>')
question.choice = models.YES
question.save()