django mate嵌套类

http://my.oschina.net/zhajiang/blog/56814

meta嵌套类

class Person(models.Model):
    first=models.CharField(max_length=100)
    last=models.CharField(max_length=100)
    middle=models.CharField(max_length=100,blank=True)
 
    class Meta:
        #the proper way to oder people,assuming a Last,First M. style of display
        ordering=['last','first','middle']
        #Here we encode the fact that we can't have a person with a 100%
        #identical name. Of course,in real life,we could,but we'll pretend
        #this is an ideal worl
        unique_together=['first','last','middle']
        #Django's default pluralization is simply to add 's' to the end:that
        #doesn't work here.
        verbose_name_plural="people"

Meta 类主要处理模型各种元数据的使用和显示：查询数据表示的排序，数据表的名字等。

django-chinese-docs-16/django-chinese-docs-16-latest/ref/models/options.html

media嵌套类

Assets as a static definition

The easiest way to define assets is as a static definition. Using this method, the declaration is an inner Media class. The properties of the inner class define the requirements.

Here’s a simple example:

from django import forms

class CalendarWidget(forms.TextInput):
    class Media:
        css = {
            'all': ('pretty.css',)
        }
        js = ('animations.js', 'actions.js')

This code defines a CalendarWidget, which will be based on TextInput. Every time the CalendarWidget is used on a form, that form will be directed to include the CSS file pretty.css, and the JavaScript filesanimations.js and actions.js.

This static definition is converted at runtime into a widget property named media. The list of assets for a CalendarWidget instance can be retrieved through this property:

---django-chinese-docs-16/django-chinese-docs-16-latest/topics/forms/media.html