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[英]Django ORM: How can I filter based on an annotation timedelta result
[英]How Can I filter Django Models based on lambda expression result?
我知道我本可以使用python自己的功能性工具集,但我希望Django中有解決此問題的方法。
我有這個模型:
class AssetGeoFenceEvent(models.Model):
#...
#assets, for which this event is assigned
asset = models.ForeignKey(Asset)
#...
引用的Asset
模型如下:
class Asset(models.Model):
#...
client = models.ForeignKey(Client)
#....
我以為我可以:
#get all the registered events for this client
events = AssetGeoFenceEvent.objects.filter(asset.client == client)
但這失敗並顯示錯誤:
關鍵字不能是表達式
嘗試了這個,但是失敗了:
#get all the registered events for this client
events = AssetGeoFenceEvent.objects.filter(lambda a: a.client == client)
這給我一個錯誤
“功能”對象不可迭代
那么我如何使用Django做到這一點呢?
你做錯了 。
events = AssetGeoFenceEvent.objects.filter(asset__client=client)
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