As reported in https://github.com/langchain-ai/langchain-mongodb/issues/163, our parsing logic is expecting a JSON value, so the following gives an error:

 

Error: ValueError('Cannot execute command db.contracts.aggregate([ { "$match":

{ "contractType1": ObjectId("685ce918a1903cacfd052234") }

}, { "$project":

{ "contractName": 1, "contract_prefix": 1, "contractStatus": 1, "contractExpiry": 1, "effectiveDate": 1 }

}, { "$sort":

{ "createdAt": -1 }

}, { "$limit": 5 } ])')

 

We should be able to handle ObjectId values in 
MongoDBDatabase._parse_command, despite our LLM prompt asking for JSON values.