Handel zwavel maart mongodb filter if field exists voor mij Gevestigde theorie Wiegen
How to use $exists operator in MongoDB
javascript - Mongodb check If field exists in an sub-document of an array - Stack Overflow
When the field is not defined in the mongoose.model(), the filter condition {field: {$exists: true}} in the collection.find() does not take effect · Issue #12402 · Automattic/mongoose · GitHub
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How to use $exists operator in MongoDB
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