What causes this Err message : BadValue unknown top level operator

[Lady Redhead]

Got this error message and I don't know what this tells me about my query, where do i have to look

for my mistake ?

( It was purpose that I don't posted the query, I dont want to get told, this is your mistake, I want to learn to find it on my own )

[Andrew Morrow]

Hi - 

The error message that you are getting is telling you that you have written an incorrect query. You can see where the error message was generated by the server here: https://github.com/mongodb/mongo/blob/826bdb4c161faf9ac28592cb5b70554251a2dc86/src/mongo/db/matcher/expression_parser.cpp#L356

I found this by running grep over the sources:

> grep -nr 'unknown top level operator' src/mongo

src/mongo/db/matcher/expression_parser.cpp:356:                                   << "unknown top level operator: " << e.fieldName())};

By reading the MatchExpressionParser::_parse function (starting at https://github.com/mongodb/mongo/blob/826bdb4c161faf9ac28592cb5b70554251a2dc86/src/mongo/db/matcher/expression_parser.cpp#L291) you should be able to compare your query and the code to figure out what you have written that the expression parser does not understand.

Alternatively, you could review the query documentation (https://docs.mongodb.org/manual/tutorial/query-documents) and ensure that your query only uses operators as described.

In the future, please provide the version of MongoDB that you are using when asking questions, as it will help us provide an accurate response.

Thanks,

Andrew

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