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用于存储电子邮件地址列表的自定义Django字段

django python

AndrewF · 技术社区 · 15 年前

我正在尝试向Django模型添加一个字段,该模型将表示电子邮件地址列表。我希望用户在管理中输入一个逗号分隔的地址列表,然后我的应用程序将解析该列表以发送一系列电子邮件。

foo@example.com, bar@example.com ,然后正确地将其写入数据库 [u'foo@example.com', u'bar@example.com'] [u'foo@example.com',u'bar@example.com'] [u"[u'foo@example.com'", u"u'bar@example.com']"] .

如何将python列表表示转换回字符串,以便在管理中使用?这就是 value_to_string 方法还是需要在其他地方进行转换?

class EmailListField(models.TextField):
    __metaclass__ = models.SubfieldBase

    def to_python(self, value):
        if not value:
            return
        if isinstance(value, list):
            return value
        return [address.strip() for address in value.split(',')]

    def get_db_prep_value(self, value):
        if not value:
            return
        return ','.join(unicode(s) for s in value)

    def value_to_string(self, obj):
        value = self._get_val_from_obj(obj)
        return self.get_db_prep_value(value)

这是基于 SeparatedValuesField 描述如下: http://www.davidcramer.net/code/181/custom-fields-in-django.html .

4 回复 | 直到 15 年前

hughdbrown 15 年前

我不会那么做的。我会把你的 EmailListField

Thorin Schiffer 12 年前

这个问题已经解决了,但是可以通过将特定的表示添加到python val中来实现

class EmailDomainsListField(models.TextField):
    __metaclass__ = models.SubfieldBase

    class Presentation(list):

        def __unicode__(self):
            return u",".join(self)
        def __str__(self):
            return ",".join(self)
    ...

    def to_python(self, value):
        if not value:
            return
        if isinstance(value, EmailDomainsListField.Presentation):
            return value
        return EmailDomainsListField.Presentation([address.strip() for address in        value.split(',')])

Cuchac 12 年前

下面是一个模型字段,其中包含每个电子邮件的验证和正确的管理处理。基于eviltnan和AndrewF的回答。

from django.core import validators
from django.db import models


class EmailListField(models.CharField):
    __metaclass__ = models.SubfieldBase

    class EmailListValidator(validators.EmailValidator):
        def __call__(self, value):
            for email in value:
                super(EmailListField.EmailListValidator, self).__call__(email)

    class Presentation(list):

        def __unicode__(self):
            return u", ".join(self)

        def __str__(self):
            return ", ".join(self)

    default_validators = [EmailListValidator()]

    def get_db_prep_value(self, value, *args, **kwargs):
        if not value:
            return
        return ','.join(unicode(s) for s in value)

    def value_to_string(self, obj):
        value = self._get_val_from_obj(obj)
        return self.get_db_prep_value(value)

    def to_python(self, value):
        if not value:
            return
        if isinstance(value, self.Presentation):
            return value
        return self.Presentation([address.strip() for address in value.split(',')])

jhonkola 9 年前

class MultiEmailField(models.TextField):

    def to_python(self, value):

        if not value:
            return None  # []

        cleaned_email_list = list()
        #email_list = filter(None, value.split(','))
        email_list = filter(None, re.split(r';|,\s|\n', value))

        for email in email_list:
            if email.strip(' @;,'):
                cleaned_email_list.append(email.strip(' @;,'))

        print cleaned_email_list
        cleaned_email_list = list(set(cleaned_email_list))

        return ", ".join(cleaned_email_list)

    def validate(self, value, model_instance):
        """Check if value consists only of valid emails."""

        # Use the parent's handling of required fields, etc.
        super(MultiEmailField, self).validate(value, model_instance)

        email_list = value.split(',')

        for email in email_list:
            validate_email(email.strip())