javascript - Mongoose how to insert element on existing objects (MongoDB and Node.js) -


in model, have this: 

subjects: {     mathematics: {       questionsanswered: [         "x+2=3, solve x please",         "how write expression represents quadrantal angles?"       ],       questionsasked: [         "how convert sin cos?",         "factor trinomial: 3x^2+7x+2"       ]     } }

as can see, there're lot of sub-elements , i'm totally beginner mongoose , node.js, i'm trying add question(string) in questionsanswered array field. looked on documentation , tried 

usermodel.update({username: username},{$pushall: { subjects:{mathematics:{questionsasked:['what definition of calculus']}}}},{upsert:true},function(err){                 if(err){                         console.debug(err);                 }else{                         console.debug("successfully added");                 }         });

but says 'modifier $pushall allowed arrays only', know how insert element in questionsanswered array? lot ahead!


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