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Description
Is your feature request related to a problem? Please describe.
Our connectors are not very smart about the field they query
Describe the solution you'd like
Adding an optional "projection" parameter to connector, for find, findOne...
Describe alternatives you've considered
Mongo/Mongoose often takes the projection as the second parameter: selector, then projection, then options (sort, limit).
In Vulcan the order would be slightly different: selector, options, projection. This makes more sense because projection is less used in custom resolvers.