Django 管理员尝试捕捉信号
Django admin try catch on signals
您好，在 Django 信号函数中进行查询时，我目前无法跳过不显示错误（管理端）
我有这两个型号：
class TopUp(models.Model):
class Meta:
db_table = "topups"
verbose_name = 'Topup'
verbose_name_plural = 'Topups'
user = models.ForeignKey("backend.User", null=True, blank=True, related_name='user_optup', on_delete=models.CASCADE)
currency = models.ForeignKey("backend.Currency", null=True, blank=True, related_name='user_topup_currency', on_delete=models.SET_NULL)
TOPUP_METHOD_CHOICES = [
(0, 'fiat'),
(1, 'chain')
]
method = models.PositiveSmallIntegerField("Method", choices=TOPUP_METHOD_CHOICES, default=0)
amount = models.DecimalField("Amount", max_digits=65, decimal_places=0, default=0)
TOPUP_STATUS_CHOICES = [
(0, 'Pending'),
(1, 'Approved'),
(100, 'Rejected'),
]
status = models.PositiveSmallIntegerField("Status", choices=TOPUP_STATUS_CHOICES, default=0)
class UserBalance(models.Model):
class Meta:
db_table = "user_balances"
verbose_name = 'User Balance'
verbose_name_plural = 'User Balance'
user = models.ForeignKey("backend.User", null=True, blank=True, related_name='user_balance', on_delete=models.CASCADE)
currency = models.ForeignKey("backend.Currency", null=True, blank=True, related_name='user_balance_currency', on_delete=models.SET_NULL)
balance = models.DecimalField("Balance", max_digits=65, decimal_places=0, default=0)
逻辑在 Django 管理上，如果 TopUps 上的状态发生变化（也就是向帐户记录中添加资金），它将处理用户余额上的余额
如果状态更改为 1（已批准），则使用该货币的用户余额会增加，如果拒绝则恢复，依此类推...
我的admin.py:
class TopUpsAdmin(admin.ModelAdmin):
list_display = ('get_phone_number',)
def get_phone_number(self, obj):
return obj.user.phone_number
get_phone_number.short_description = 'User'
get_phone_number.admin_order_field = 'user_phone_number'
def get_readonly_fields(self, request, obj=None):
return ('id', )
def save_model(self, request, obj, form, change):
update_fields = []
# True if something changed in model
# Note that change is False at the very first time
if change:
if form.initial['status'] != form.cleaned_data['status']:
update_fields.append('status')
obj.save(update_fields=update_fields)
else:
obj.save()
else:
obj.save()
pass
admin.site.register(TopUp, TopUpsAdmin)
这是我在 django 的管理站点（更改视图）上更改状态时要处理的信号：
@receiver(pre_save, sender=TopUp)
def handle_balance_on_topups_status_updated(sender, instance, update_fields, **kwargs):
if update_fields is not None:
if 'status' in update_fields:
try:
old_topups = TopUp.objects.get(pk=instance.id)
user = UserBalance.objects.get(user=instance.user, currency=instance.currency)
if (old_topups.status == 0) and (instance.status == 1):
user.balance += instance.amount
user.save()
elif (old_topups.status == 1) and (instance.status == 100) and (user.balance > 0):
user.balance -= instance.amount
user.save()
elif (old_topups.status == 1) and (instance.status == 0) and (user.balance > 0):
user.balance -= instance.amount
user.save()
elif (old_topups.status == 100) and (instance.status == 1):
user.balance += instance.amount
user.save()
except TopUp.DoesNotExist or UserBalance.DoesNotExist:
pass
如果 TopUp 或 UserBalane 查询在通过信号时失败，我写了一个 try-catch 不在管理页面上显示错误，但是当我尝试在具有 UserBalance 的货币的 TopUp 上批准时没有，我的管理页面仍然显示错误。
回溯错误：
Traceback (most recent call last):
web_1 | File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
web_1 | response = get_response(request)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response
web_1 | response = self.process_exception_by_middleware(e, request)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response
web_1 | response = wrapped_callback(request, *callback_args, **callback_kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/options.py", line 606, in wrapper
web_1 | return self.admin_site.admin_view(view)(*args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
web_1 | response = view_func(request, *args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
web_1 | response = view_func(request, *args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/sites.py", line 223, in inner
web_1 | return view(request, *args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/options.py", line 1648, in change_view
web_1 | return self.changeform_view(request, object_id, form_url, extra_context)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/utils/decorators.py", line 45, in _wrapper
web_1 | return bound_method(*args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
web_1 | response = view_func(request, *args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/options.py", line 1529, in changeform_view
web_1 | return self._changeform_view(request, object_id, form_url, extra_context)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/options.py", line 1572, in _changeform_view
web_1 | self.save_model(request, new_object, form, not add)
web_1 | File "/app/backend/admin.py", line 308, in save_model
web_1 | obj.save(update_fields=update_fields)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/db/models/base.py", line 741, in save
web_1 | force_update=force_update, update_fields=update_fields)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/db/models/base.py", line 766, in save_base
web_1 | update_fields=update_fields,
web_1 | File "/usr/local/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 175, in send
web_1 | for receiver in self._live_receivers(sender)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 175, in <listcomp>
web_1 | for receiver in self._live_receivers(sender)
web_1 | File "/app/backend/models.py", line 389, in handle_balance_on_topups_status_updated
web_1 | user = UserBalance.objects.get(user=instance.user, currency=instance.currency)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/db/models/manager.py", line 82, in manager_method
web_1 | return getattr(self.get_queryset(), name)(*args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/db/models/query.py", line 408, in get
web_1 | self.model._meta.object_name
web_1 | backend.models.UserBalance.DoesNotExist: UserBalance matching query does not exist.
我预计它不会显示错误，但仍会在管理页面上保存更改的状态，但用户余额不会受到影响（因为使用该货币的 UserBalance 不存在）
为什么我的 try-except 在信号中不起作用？
捕获 multiple exception classes with one except statement use parentheses 列出异常 类:
except (TopUp.DoesNotExist, UserBalance.DoesNotExist):
您好，在 Django 信号函数中进行查询时，我目前无法跳过不显示错误（管理端）
我有这两个型号：
class TopUp(models.Model):
class Meta:
db_table = "topups"
verbose_name = 'Topup'
verbose_name_plural = 'Topups'
user = models.ForeignKey("backend.User", null=True, blank=True, related_name='user_optup', on_delete=models.CASCADE)
currency = models.ForeignKey("backend.Currency", null=True, blank=True, related_name='user_topup_currency', on_delete=models.SET_NULL)
TOPUP_METHOD_CHOICES = [
(0, 'fiat'),
(1, 'chain')
]
method = models.PositiveSmallIntegerField("Method", choices=TOPUP_METHOD_CHOICES, default=0)
amount = models.DecimalField("Amount", max_digits=65, decimal_places=0, default=0)
TOPUP_STATUS_CHOICES = [
(0, 'Pending'),
(1, 'Approved'),
(100, 'Rejected'),
]
status = models.PositiveSmallIntegerField("Status", choices=TOPUP_STATUS_CHOICES, default=0)
class UserBalance(models.Model):
class Meta:
db_table = "user_balances"
verbose_name = 'User Balance'
verbose_name_plural = 'User Balance'
user = models.ForeignKey("backend.User", null=True, blank=True, related_name='user_balance', on_delete=models.CASCADE)
currency = models.ForeignKey("backend.Currency", null=True, blank=True, related_name='user_balance_currency', on_delete=models.SET_NULL)
balance = models.DecimalField("Balance", max_digits=65, decimal_places=0, default=0)
逻辑在 Django 管理上，如果 TopUps 上的状态发生变化（也就是向帐户记录中添加资金），它将处理用户余额上的余额 如果状态更改为 1（已批准），则使用该货币的用户余额会增加，如果拒绝则恢复，依此类推...
我的admin.py:
class TopUpsAdmin(admin.ModelAdmin):
list_display = ('get_phone_number',)
def get_phone_number(self, obj):
return obj.user.phone_number
get_phone_number.short_description = 'User'
get_phone_number.admin_order_field = 'user_phone_number'
def get_readonly_fields(self, request, obj=None):
return ('id', )
def save_model(self, request, obj, form, change):
update_fields = []
# True if something changed in model
# Note that change is False at the very first time
if change:
if form.initial['status'] != form.cleaned_data['status']:
update_fields.append('status')
obj.save(update_fields=update_fields)
else:
obj.save()
else:
obj.save()
pass
admin.site.register(TopUp, TopUpsAdmin)
这是我在 django 的管理站点（更改视图）上更改状态时要处理的信号：
@receiver(pre_save, sender=TopUp)
def handle_balance_on_topups_status_updated(sender, instance, update_fields, **kwargs):
if update_fields is not None:
if 'status' in update_fields:
try:
old_topups = TopUp.objects.get(pk=instance.id)
user = UserBalance.objects.get(user=instance.user, currency=instance.currency)
if (old_topups.status == 0) and (instance.status == 1):
user.balance += instance.amount
user.save()
elif (old_topups.status == 1) and (instance.status == 100) and (user.balance > 0):
user.balance -= instance.amount
user.save()
elif (old_topups.status == 1) and (instance.status == 0) and (user.balance > 0):
user.balance -= instance.amount
user.save()
elif (old_topups.status == 100) and (instance.status == 1):
user.balance += instance.amount
user.save()
except TopUp.DoesNotExist or UserBalance.DoesNotExist:
pass
如果 TopUp 或 UserBalane 查询在通过信号时失败，我写了一个 try-catch 不在管理页面上显示错误，但是当我尝试在具有 UserBalance 的货币的 TopUp 上批准时没有，我的管理页面仍然显示错误。
回溯错误：
Traceback (most recent call last):
web_1 | File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
web_1 | response = get_response(request)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response
web_1 | response = self.process_exception_by_middleware(e, request)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response
web_1 | response = wrapped_callback(request, *callback_args, **callback_kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/options.py", line 606, in wrapper
web_1 | return self.admin_site.admin_view(view)(*args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
web_1 | response = view_func(request, *args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
web_1 | response = view_func(request, *args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/sites.py", line 223, in inner
web_1 | return view(request, *args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/options.py", line 1648, in change_view
web_1 | return self.changeform_view(request, object_id, form_url, extra_context)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/utils/decorators.py", line 45, in _wrapper
web_1 | return bound_method(*args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
web_1 | response = view_func(request, *args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/options.py", line 1529, in changeform_view
web_1 | return self._changeform_view(request, object_id, form_url, extra_context)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/contrib/admin/options.py", line 1572, in _changeform_view
web_1 | self.save_model(request, new_object, form, not add)
web_1 | File "/app/backend/admin.py", line 308, in save_model
web_1 | obj.save(update_fields=update_fields)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/db/models/base.py", line 741, in save
web_1 | force_update=force_update, update_fields=update_fields)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/db/models/base.py", line 766, in save_base
web_1 | update_fields=update_fields,
web_1 | File "/usr/local/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 175, in send
web_1 | for receiver in self._live_receivers(sender)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 175, in <listcomp>
web_1 | for receiver in self._live_receivers(sender)
web_1 | File "/app/backend/models.py", line 389, in handle_balance_on_topups_status_updated
web_1 | user = UserBalance.objects.get(user=instance.user, currency=instance.currency)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/db/models/manager.py", line 82, in manager_method
web_1 | return getattr(self.get_queryset(), name)(*args, **kwargs)
web_1 | File "/usr/local/lib/python3.7/site-packages/django/db/models/query.py", line 408, in get
web_1 | self.model._meta.object_name
web_1 | backend.models.UserBalance.DoesNotExist: UserBalance matching query does not exist.
我预计它不会显示错误，但仍会在管理页面上保存更改的状态，但用户余额不会受到影响（因为使用该货币的 UserBalance 不存在）
为什么我的 try-except 在信号中不起作用？
捕获 multiple exception classes with one except statement use parentheses 列出异常 类:
except (TopUp.DoesNotExist, UserBalance.DoesNotExist):