node.js - how to find distinct field of a model upon an and condition in mongoose? -


i looking find list of distinct fields of model satisfies both 2 conditions.

from doc : http://mongoosejs.com/docs/api.html#model_model.distinct

i found can pass array of conditions second parameter in model.distinct(). array of conditions seems linked via 'or' operation. if 1 condition satisfies field listed.

but want field if both conditions satisfies.

and when use : 

model.distinct(field).and(arrayofconditions).exec(callback);

then error : 

typeerror: cannot call method 'map' of undefined     @ schemaboolean.handlearray (/users/user1/node_modules/mongoose/lib/schema/boolean.js:56:14)

distinct doesn't return full functioning query object instead:

model.distinct(field, {$and: arrayofconditions}).exec(callback);

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