django搭建web (四) models.py

demo

该demo模型主要是用于问题，选择单个或多个答案的问卷形式应用

# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.db import models
# Create your models here.
choice_style = (
        ('r','radio'),
        ('c','checkbox')
    )

class myQuestion(models.Model):
    question_text = models.CharField(max_length = 600)
    question_style = models.CharField(max_length = 1,choices = choice_style)
   
    def __unicode__(self):
	return self.question_text

class myAnswer(models.Model):
    answer_text = models.CharField(max_length = 200)
    questions = models.ForeignKey(myQuestion)
    answer_votes = models.IntegerField(default = 0)
    def __unicode__(self):
        return self.answer_text

同时！要修改admin.py中的字段，或者注释起来

class myQuestion(admin.ModelAdmin):
    # fieldsets = [
    #     (None,               {'fields': ['question_text']}),
    #     ('Date information', {'fields': ['pub_date'], 'classes': ['collapse']}),
    # ]
    inlines = [ChoiceInline]
    #list_display = ('question_text', 'pub_date')

这里创建了两个模型，都是继承自models

在第一个模型myQuestion中，max_length表示此处可填字段最大长度，

question_style = models.CharField(max_length = 1,choices = choice_style)

一句choices = choice_style为模型创建了一个下拉框，choice_style是前面代码定义的一个tuple如下所示:

下句是为了问题不展开时，可以以本question_text作为标题显示

def __unicode__(self):
	return self.question_text

以下语句是建立一对多关系（外键)，一个答案可对应多个问题，具体可查---ORM

questions = models.ForeignKey(myQuestion)

以下语句设置了一个int型变量answer_votes，并初始化为0

answer_votes = models.IntegerField(default = 0)