parse.com - Query Relational data on Parse -

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i have seen other questions relating querying relational data on parse , don't quite meet need.

i have 3 related classes: teacher (1->many) course (many<-1) category

given above structure, want query instructors have courses fall under category. here have far:

    var category = parse.object.extend("category");     var category = new category();     category.id = "shdh43ay";      var course = parse.object.extend("course"); //there pointers on course both teacher , category     var coursequery = new parse.query(course);     coursequery.equals('category', category);       var teacher = parse.object.extend("teacher");     var teacherquery = new parse.query(teacher);     teacherquery.matchesquery(); //here stuck

it doesn't me matchesquery trick, ideas welcome


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