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Type:
Bug
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: Linq
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Labels:
Driver version 2.8.2
string.isNullOrEmpty utilizes a test for null equality using
"$or":[
{
"$eq":[
"$someField",
null
]
},
{
"$eq":[
"$someField",
""
]
}
]
}
However, if the field is not present, the null equality operation returns false.
The null coalescing operator (??) on the other hand does work with both nulls and non-existing fields, and uses the $ifNull operation rather than equality.
"Url":{ "$ifNull":[ "$shopUrl", "$typeUrl" ] },
It seems that $ifNull would be a better operation to use in the composed string.IsNullOrEmpty() method.
Without this, we have to resort to strange expressions like:
isExternalUrl = string.IsNullOrEmpty((pt.ShopUrl ?? "")),
If I don't use the null coalescing operator in that example, the evaluation will return false when the field does not exist.
- is related to
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- Closed
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- mentioned in
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