本文整理汇总了Python中django.db.models.PROTECT属性的典型用法代码示例。如果您正苦于以下问题：Python models.PROTECT属性的具体用法？Python models.PROTECT怎么用？Python models.PROTECT使用的例子？那么恭喜您, 这里精选的属性代码示例或许可以为您提供帮助。您也可以进一步了解该属性所在模块django.db.models的用法示例。

在下文中一共展示了models.PROTECT属性的6个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的Python代码示例。

示例1: ask_remove_enum_values

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# 需要导入模块: from django.db import models [as 别名]

# 或者: from django.db.models import PROTECT [as 别名]

def ask_remove_enum_values(self, db_type, values):

""" How to treat records with deleted enum values. """

# Ordered ensures

choices = [

(models.CASCADE, "Cascade - Delete records with removed values"),

(models.PROTECT, "Protect - Block migrations if records contain removed values"),

(models.SET_NULL, "Set NULL - Set value to NULL"),

(models.SET_DEFAULT, "Set default - Set value to field default"),

(models.SET, "Set value - Provide a one off default now"),

(models.DO_NOTHING, "Do nothing - Consistency must be handled elsewhere"),

(None, "Leave it to field definitions")]

choice, _ = choices[self._choice_input(

"Enum {db_type} has had {values} removed, "

"existing records may need to be updated. "

"Override update behaviour or do nothing and follow field behaviour.".format(

db_type=db_type,

values=values),

[q for (k, q) in choices]) - 1]

if choice == models.SET:

return models.SET(self._ask_default())

return choice

开发者ID:ashleywaite，项目名称:django-more，代码行数:23，

示例2: __init__

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# 需要导入模块: from django.db import models [as 别名]

# 或者: from django.db.models import PROTECT [as 别名]

def __init__(self, db_type, add_values=None, remove_values=None, on_delete=models.PROTECT):

self.db_type = db_type

self.add_values = set(add_values or ())

self.remove_values = set(remove_values or ())

self.on_delete = on_delete

开发者ID:ashleywaite，项目名称:django-more，代码行数:7，

示例3: create_snapshot_model

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# 需要导入模块: from django.db import models [as 别名]

# 或者: from django.db.models import PROTECT [as 别名]

def create_snapshot_model(cls, fields=[]):

""" Dynamically create a main Model, 1-1 with the model being snapshotted. """

# Models must have unique names, so we create a name by suffixing model class name with 'Snapshot'

name = cls.__name__ + 'Snapshot'

class Meta:

db_table = '%s_snapshot' % cls._meta.db_table

app_label = cls._meta.app_label

verbose_name = u'%s - snapshot' % cls._meta.verbose_name

verbose_name_plural = u'%s - snapshoty' % cls._meta.verbose_name

ordering = ['-created_at']

# Set up a dictionary to simulate declarations within a class.

attrs = {

'__module__': cls.__module__,

'Meta': Meta,

'id': models.AutoField(primary_key=True),

'created_at': models.DateTimeField(u"stworzony dnia", auto_now_add=True),

'snapshot_of': models.ForeignKey(cls, verbose_name=u"dotyczy", null=False, on_delete=models.PROTECT, related_name="snapshots"),

'__unicode__': lambda self: u'snapshot',

}

# Copy fields

for field_name in fields:

target_field = cls._meta.get_field_by_name(field_name)[0]

attrs[field_name] = copy_field(target_field)

return type(name, (models.Model,), attrs)

开发者ID:KlubJagiellonski，项目名称:Politikon，代码行数:30，

示例4: post

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# 需要导入模块: from django.db import models [as 别名]

# 或者: from django.db.models import PROTECT [as 别名]

def post(self, request, *args, **kwargs):

try:

msg = _("%(model_name)s '%(instance)s' deleted.") % {

'model_name': self.verbose_name, 'instance': self.instance

}

self.delete_instance()

messages.success(request, msg)

return redirect(self.index_url)

except models.ProtectedError:

linked_objects = []

fields = self.model._meta.fields_map.values()

fields = (obj for obj in fields if not isinstance(

obj.field, ManyToManyField))

for rel in fields:

if rel.on_delete == models.PROTECT:

if isinstance(rel, OneToOneRel):

try:

obj = getattr(self.instance, rel.get_accessor_name())

except ObjectDoesNotExist:

pass

else:

linked_objects.append(obj)

else:

qs = getattr(self.instance, rel.get_accessor_name())

for obj in qs.all():

linked_objects.append(obj)

context = self.get_context_data(

protected_error=True,

linked_objects=linked_objects

)

return self.render_to_response(context)

开发者ID:wagtail，项目名称:wagtail，代码行数:33，

示例5: post

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# 需要导入模块: from django.db import models [as 别名]

# 或者: from django.db.models import PROTECT [as 别名]

def post(self, request, *args, **kwargs):

if request.POST:

try:

self.delete_instance()

messages.success(

request,

_("{model} '{instance}' deleted.").format(

model=self.model_name, instance=self.instance))

return redirect(self.get_index_url)

except models.ProtectedError:

messages.error(

request, _(

"{model} '{instance}' could not be deleted."

).format(model=self.model_name, instance=self.instance))

linked_objects = []

for rel in self.model._meta.get_all_related_objects():

if rel.on_delete == models.PROTECT:

qs = getattr(self.instance, rel.get_accessor_name())

for obj in qs.all():

linked_objects.append(obj)

context = {

'view': self,

'instance': self.instance,

'error_protected': True,

'linked_objects': linked_objects,

}

return self.render_to_response(context)

开发者ID:rkhleics，项目名称:wagtailmodeladmin，代码行数:31，

示例6: media_consumi

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# 需要导入模块: from django.db import models [as 别名]

# 或者: from django.db.models import PROTECT [as 别名]

def media_consumi(self):

rifornimenti = Rifornimento.objects.filter(veicolo=self)

litri = 0

for rifornimento in rifornimenti:

litri += rifornimento.consumo_carburante

try:

ultimo_rifornimento = Rifornimento.objects.filter(veicolo=self).latest("data")

primo_rifornimento = Rifornimento.objects.filter(veicolo=self).earliest("data")

except Rifornimento.DoesNotExist:

return 0

km = ultimo_rifornimento.contachilometri - primo_rifornimento.contachilometri

litri -= ultimo_rifornimento.consumo_carburante

if litri != 0:

return round(km/litri, 2)

else:

return 0

# class Immatricolazione(ModelloSemplice, ConMarcaTemporale):

# """

# Rappresenta una pratica di immatricolazione di un Veicolo

#

# Una pratica viene istruita da un ufficio motorizzazione per conto di una unita' CRI richiedente.

# La stessa viene sottoposta a due stadi di approvazione, in seguito alla istruzione. Quando la

# pratica termina, il veicolo viene immatricolato ed entra in servizio.

# """

#

# class Meta:

# verbose_name = "Pratica di Immatricolazione"

# verbose_name_plural = "Pratiche di Immatricolazione"

#

# richiedente = models.ForeignKey(Sede, related_name='immatricolazioni_richieste', null=True, on_delete=models.SET_NULL)

# ufficio = models.ForeignKey(Sede, related_name='immatricolazioni_istruite', on_delete=models.PROTECT)

# veicolo = models.ForeignKey(Veicolo, related_name='richieste_immatricolazione', on_delete=models.CASCADE)

开发者ID:CroceRossaItaliana，项目名称:jorvik，代码行数:35，

注：本文中的django.db.models.PROTECT属性示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。