我們想在保存用戶進入數據庫之前做一些字段的校驗，先貼出代碼；

import re from django.db import models from django.db.models.signals import pre_save from django.dispatch import receiverUNAME_REG = re.compile(r"^\w*") DATE_REG = re.compile(r"(19\d{2})|(20\d{2})-(0[1-9])|(1[1-2])-(0[1-9])|([12][0~9])|(3[0-1])")class User(models.Model):name = models.CharField(max_length=32)birthday = models.DateField()gender = models.BooleanField(default=True)desc = models.CharField(max_length=256)is_active = models.BooleanField(default=True)logger = logging.getLogger(__name__)@receiver(pre_save, sender=User) def pre_save_handler(sender, **kwargs):logger.debug("{},{}".format(sender, **kwargs))if not re.match(UNAME_REG, kwargs.uname):
　　　　 logging.error("username has error!")return if not re.match(UNAME_REG, kwargs.udate):
　　　　 logging.error("birthday has error!")return

signals.py 文件在 django.db.models.signals，以下是部分源碼

?
from django.apps import apps
from django.dispatch import Signal
from django.utils import six


class_prepared = Signal(providing_args=["class"])


class ModelSignal(Signal):

# Model初始化之前
pre_init = ModelSignal(providing_args=["instance", "args", "kwargs"], use_caching=True)
# Model初始化之后
post_init = ModelSignal(providing_args=["instance"], use_caching=True)
# Model調用save之前，可以做一些驗證之類的操作
pre_save = ModelSignal(providing_args=["instance", "raw", "using", "update_fields"], use_caching=True)
# Model保存之后，可以添加一些任務，關聯驗證這些
post_save = ModelSignal(providing_args=["instance", "raw", "created", "using", "update_fields"], use_caching=True)
# Model調用刪除之前
pre_delete = ModelSignal(providing_args=["instance", "using"], use_caching=True)
# Model調用刪除之后，可以做刪除一些關聯數據，關聯任務之類的操作
post_delete = ModelSignal(providing_args=["instance", "using"], use_caching=True)
# 關聯數據發生變化時
m2m_changed = ModelSignal(providing_args=["action", "instance", "reverse", "model", "pk_set", "using"], use_caching=True)
# 改變模型
pre_migrate = Signal(providing_args=["app_config", "verbosity", "interactive", "using"])
post_migrate = Signal(providing_args=["app_config", "verbosity", "interactive", "using"])
# 同步數據，創建數據表
pre_syncdb = Signal(providing_args=["app", "create_models", "verbosity", "interactive", "db"])
post_syncdb = Signal(providing_args=["class", "app", "created_models", "verbosity", "interactive", "db"])

Django==1.7.7

轉載于:https://www.cnblogs.com/huaizhi/p/8603180.html

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