django中forms和modelform组件的区别

首先，我们来看看modelform的实现

model.py
class Book(models.Model):
    title=models.CharField(max_length=32)
    price=models.DecimalField(max_digits=8,decimal_places=2)
    pub_date=models.DateField()
    publish=models.ForeignKey("Publish")
    authors=models.ManyToManyField("Author")
    def __str__(self): return self.title

forms.py
#Modelform将一个model转化成一个form组件
class BookModelForm(forms.ModelForm):
     class Meta:
        model=models.Book
        fields="__all__"
这一步做的事情相当于下面的代码
'''
class BookModelForm(form.Form):
     title=forms.CharField(max_length=32)
     price=forms.IntegerField()
     pub_date=forms.DateField()

'''

下面看看forms组件里面的内容：里面包含了很多的类和插件,并且包含了modelform组件

"""
Django validation and HTML form handling.   #Django验证和HTML表单处理

"""  
from django.core.exceptions import ValidationError # NOQA 
from django.forms.boundfield import * # NOQA 
from django.forms.fields import * # NOQA 
from django.forms.forms import * # NOQA 
from django.forms.formsets import * # NOQA 
from django.forms.models import * # NOQA 
from django.forms.widgets import * # NOQA

下面定位到modelform:它继承了BaseModelForm

class ModelForm(six.with_metaclass(ModelFormMetaclass, BaseModelForm)):
    pass