django搭建web (四) models.py

demo

# -*- 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

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

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)