子类的 Django 模型/数据库设计

Question

好吧，我描述的很糟糕。这是一个关系诊断。

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

问题是我几乎可以肯定这不是正确的方法，即使是，我也无法弄清楚如何允许 Django 中的管理区域显示向用户询问他们想要什么子类型的部分的选择。

构建此类模型的最佳方法是什么？

Answer 1

您也可以有一个部分类，其属性 type 可以是评级或多选 - 它将在管理中呈现为选择框。
但我认为你应该看看 Django 创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()