My database contains records with a field that has different data types in each record. I would like to query only for the records where this field contains strings. Is there a way to search for specific data types in this field?
{"field1":ObjectId("53de"),"field2":string}
{"field1":string,"field2":string}
{"field1":NumberLong(123),"field2":string}
For example, I am looking for something similar to:
db.collection.find({field1:{$regex:"some string format"}})
If you need to query attributes against specific types, the $type operator can be useful:
db.collection.find( { "field1": { $type : 2 } } )
To understand more about how string values are represented by the integer 2, refer to the documentation for $type.
To update these values, you can use an update statement along with a query on the $type. For example, this code snippet changes the field1 attribute to be an ObjectId():
db.collection.update(
{ "field1": { $type : 2 } },
{ "$set": {
"field1": ObjectId()
} }
)
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