Django-自定义ModelForm

from django import forms

1.创建modelform函数
def create_modelform(name, **kwargs):
　　Meta = type('Meta', (), kwargs)
　　external_class_dict = {}
　　add_fields = new_fields(kwargs.get("fields"))
　　external_class_dict['Meta'] = Meta
　　if add_fields != {}:
　　　　external_class_dict.update(**add_fields)
　　hook = local_hooks(kwargs.get("fields"),model=model_object)
　　if hook != {}:
　　　　external_class_dict.update(**hook)
　　modelform = type(name, (forms.ModelForm,), external_class_dict)
　　return modelform

2.新增验证字段

def new_fields(fields):

    auth_code = forms.CharField(max_length=12, error_messages={'required': '授权码不能为空'})
    variable = locals()
    fields_dict = {}
    for key in fields:
        val = variable.get(key)
        if val:
            fields_dict[key] = val
    return fields_dict

3.局部钩子

def local_hooks(fields,model=None):

　　"每个内置函数为局部钩子，提前定义好"
    def clean_auth_code(self):
        value = self.cleaned_data.get('auth_code')
        if value != settings.AUTHORIZATION_CODE:
            raise forms.ValidationError('授权码错误')
        return value

    def clean_account(self):
        value = self.cleaned_data.get('account')
        if len(value) < 4:
            raise forms.ValidationError('长度不能小于4！')
        elif model.objects.filter(account=value).values('account'):
            raise forms.ValidationError('账号信息存在')
        return value

    def clean_password(self):
        value = self.cleaned_data.get('password')
        if len(value) < 4:
            raise forms.ValidationError('长度不能小于4！')
        elif model.objects.filter(password=value).values('password'):
            return value
        return value

    hooks = locals()
    hook_dict = {}
    for key in fields:
        key_str = 'clean_' + key
        val = hooks.get(key_str)
        if val:
            hook_dict[key_str] = val
    return hook_dict