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85 lines
2.6 KiB
85 lines
2.6 KiB
"""
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此文件作为 `django.db.models` 的 shortcut
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这样做的优点与缺点为：
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优点：
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- 包命名都统一为 `models`
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- 用户在使用的时候只导入本文件即可
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缺点：
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- 此文件中添加代码的时候，注意不要跟 `django.db.models` 中的命名冲突
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"""
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import uuid
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from django.db.models import *
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from django.db.models.functions import Concat
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from django.utils.translation import ugettext_lazy as _
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class Choice(str):
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def __new__(cls, value, label=''): # `deepcopy` 的时候不会传 `label`
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self = super().__new__(cls, value)
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self.label = label
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return self
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class ChoiceSetType(type):
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def __new__(cls, name, bases, attrs):
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_choices = []
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collected = set()
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new_attrs = {}
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for k, v in attrs.items():
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if isinstance(v, tuple):
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v = Choice(*v)
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assert v not in collected, 'Cannot be defined repeatedly'
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_choices.append(v)
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collected.add(v)
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new_attrs[k] = v
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for base in bases:
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if hasattr(base, '_choices'):
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for c in base._choices:
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if c not in collected:
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_choices.append(c)
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collected.add(c)
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new_attrs['_choices'] = _choices
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new_attrs['_choices_dict'] = {c: c.label for c in _choices}
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return type.__new__(cls, name, bases, new_attrs)
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def __contains__(self, item):
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return self._choices_dict.__contains__(item)
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def __getitem__(self, item):
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return self._choices_dict.__getitem__(item)
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def get(self, item, default=None):
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return self._choices_dict.get(item, default)
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@property
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def choices(self):
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return [(c, c.label) for c in self._choices]
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class ChoiceSet(metaclass=ChoiceSetType):
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choices = None # 用于 Django Model 中的 choices 配置， 为了代码提示在此声明
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class JMSBaseModel(Model):
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created_by = CharField(max_length=32, null=True, blank=True, verbose_name=_('Created by'))
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updated_by = CharField(max_length=32, null=True, blank=True, verbose_name=_('Updated by'))
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date_created = DateTimeField(auto_now_add=True, null=True, blank=True, verbose_name=_('Date created'))
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date_updated = DateTimeField(auto_now=True, verbose_name=_('Date updated'))
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class Meta:
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abstract = True
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class JMSModel(JMSBaseModel):
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id = UUIDField(default=uuid.uuid4, primary_key=True)
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class Meta:
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abstract = True
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def concated_display(name1, name2):
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return Concat(F(name1), Value('('), F(name2), Value(')'))
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