子類的Django模型/數據庫設計

Question

好吧，我很討厭描述。 這是一個關系診斷。

在Django中，我的模型如下：

from django.db import models
from datetime import datetime

class Survey(models.Model):
    name = models.CharField(max_length=100)
    pub_date = models.DateTimeField('date published',default=datetime.now)
    def __unicode__(self):
        return self.name

# This model should be abstracted by a more specific model
class Section(models.Model):
    survey = models.ForeignKey(Survey)
    name = models.CharField(max_length=100)
    def __unicode__(self):
        return self.name

# Models for supporting the 'ratings' mode
class RatingSection(Section):
    pass

class RatingQuestion(models.Model):
    section = models.ForeignKey(RatingSection)
    name = models.CharField(max_length=255)
    def __unicode__(self):
        return self.name

class RatingAnswer(models.Model):
    section = models.ForeignKey(RatingSection)
    name = models.CharField(max_length=60)
    def __unicode__(self):
        return self.name

class RatingVotes(models.Model):
    question = models.ForeignKey(RatingQuestion)
    answer = models.ForeignKey(RatingAnswer)
    votes = models.PositiveIntegerField(default=0)
    def __unicode__(self):
        return self.votes + self.answer.name + ' votes for ' + self.question.name

# Models for supporting the 'multichoice' mode
class MultiChoiceSection(Section):
    can_select_multiple = models.BooleanField()

class MultiChoiceQuestion(models.Model):
    section = models.ForeignKey(MultiChoiceSection)
    name = models.CharField(max_length=255)
    def __unicode__(self):
        return self.name

class MultiChoiceAnswer(models.Model):
    section = models.ForeignKey(MultiChoiceSection)
    name = models.CharField(max_length=60)
    votes = models.PositiveIntegerField(default=0)
    def __unicode__(self):
        return self.name

問題是我幾乎可以肯定這不是正確的方法，即使是這樣，我也無法弄清楚如何允許Django中的admin區域向用戶顯示選擇內容，詢問用戶什么子類型他們想要的部分。

構造這種模型的最佳方法是什么？

Answer 1

您也可以有一個節類，其屬性type可以是等級或多項選擇-將在管理員中呈現，然后作為選擇框呈現。
但我認為您應該看看Django創建抽象模型的可能性： http : //docs.djangoproject.com/en/dev/topics/db/models/#id6

class Section(models.Model):
    survey = models.ForeignKey(Survey)
    name = models.CharField(max_length=100)

    class Meta:
        abstract = True        # no db table created for this model

    def __unicode__(self):
        return self.name


class RatingSection(Section):
    pass

class MultiChoiceSection(Section):
    can_select_multiple = models.BooleanField()