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當我使用MongoEngine向文檔中添加嵌入式文檔時,它在列表爲空時第一次運行,但隨後的嘗試失敗,說:mongoengine.errors.OperationError:無法保存文檔(無法同時更新'sensorlist.1.alert_list.0._cls'和'sensorlist.1.alert_list')MongoEngine第二次沒有保存嵌入式文檔
以下測試代碼演示了此問題:如果您運行它,一旦您將看到新的foo中的集合/文檔具有S2嵌入式傳感器和2個嵌入式警報。如果你再次運行它會炸燬 - 任何想法? THX比爾
import mongoengine as ME
ME.connect('foo')
class Sensor(ME.EmbeddedDocument):
name = ME.StringField()
alert_list = ME.ListField()
class Alert(ME.EmbeddedDocument):
name = ME.StringField(default = 'new alert')
class SiteConfig(ME.Document):
siteid = ME.StringField()
sensorlist = ME.ListField(ME.EmbeddedDocumentField(Sensor))
if not SiteConfig.objects(siteid = '123456'):
newsite = SiteConfig(siteid = '123456')
newsite.save()
print("saved new site")
site = SiteConfig.objects(siteid = '123456').first()
newsensor = Sensor(name='S1')
site.sensorlist.append(newsensor)
site.save()
print("added sensor S1")
newsensor = Sensor(name='S2')
site.sensorlist.append(newsensor)
site.save()
print("added sensor S2")
for sensor in site.sensorlist:
if sensor.name =='S2':
alert = Alert()
sensor.alert_list.append(alert)
site.save()
print('added first alert to S2')
for sensor in site.sensorlist:
if sensor.name =='S2':
alert = Alert()
sensor.alert_list.append(alert)
site.save()
print('added second alert to S1')