Django组件扩展 总结

1. Form组件扩展：

　　
　　验证用户输入
　　obj = Form(reuest,POST,request.FILES)
　　if obj.is_valid():
　　　　obj.clean_data
　　else:
　　　　obj.error

    1.简单扩展
        利用Form组件自带的正则扩展：
            a. 方式一
                from django.forms import Form
                from django.forms import widgets
                from django.forms import fields
                from django.core.validators import RegexValidator

                class MyForm(Form):
                    user = fields.CharField(
                        error_messages={'invalid': '...'},
                        validators=[RegexValidator(r'^[0-9]+$', '请输入数字'), RegexValidator(r'^159[0-9]+$', '数字必须以159开头')],
                    )
            b. 方式二
                from django.forms import Form
                from django.forms import widgets
                from django.forms import fields
                from django.core.validators import RegexValidator

                class MyForm(Form):
                    user = fields.RegexField(r'^[0-9]+$',error_messages={'invalid': '...'})

    2.基于源码流程
        a. 单字段
            from django.core.exceptions import NON_FIELD_ERRORS, ValidationError
            class AjaxForm(forms.Form):
                username = fields.CharField()
                user_id = fields.IntegerField(
                    widget=widgets.Select(choices=[(0,'aa'),(1,'bb'),(2,'cc'),])
                )
            # 自定义方法 clean_字段名
            # 必须返回值self.cleaned_data['username']
            # 如果出错：raise ValidationError('用户名已存在')
            def clean_username(self):
                v = self.cleaned_data['username']
                if models.UserInfo.objects.filter(username=v).count():
                    # 整体错了
                    # 自己详细错误信息
                    raise ValidationError('用户名已存在')
                return v
            def clean_user_id(self):
                return self.cleaned_data['user_id']

        b. 整体错误验证
            class AjaxForm(forms.Form):
                username = fields.CharField()
                user_id = fields.IntegerField(
                    widget=widgets.Select(choices=[(0,'aa'),(1,'bb'),(2,'cc'),])
                )
                # 自定义方法 clean_字段名
                # 必须返回值self.cleaned_data['username']
                # 如果出错：raise ValidationError('用户名已存在')
                def clean_username(self):
                    v = self.cleaned_data['username']
                    if models.UserInfo.objects.filter(username=v).count():
                        # 整体错了
                        # 自己详细错误信息
                        raise ValidationError('用户名已存在')
                    return v
                def clean_user_id(self):
                    return self.cleaned_data['user_id']

                def clean(self):
                    value_dict = self.cleaned_data
                    v1 = value_dict.get('username')
                    v2 = value_dict.get('user_id')
                    if v1 == 'root' and v2==1:
                        raise ValidationError('整体错误信息')
                    return self.cleaned_data