parse.com - Query Relational data on Parse -

-

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


Comments

Post a Comment

Popular posts from this blog

Why does Go error when trying to marshal this JSON? -

-
i'm trying rather simple example of trying decode json file structs using golang. however, when attempting error that json: cannot unmarshal object go value of type []main.track which don't understand. here's code in question, , json can found here . package main import ( "encoding/json" "fmt" "net/http" "os" ) // tracks group of track types type tracks struct { tracks []track } // track represents singular track type track struct { name string url string artist artist } // artist represents single artist type artist struct { name string mbid string url string } func main() { url := "http://ws.audioscrobbler.com/2.0/?method=geo.gettoptracks&api_key=c1572082105bd40d247836b5c1819623&format=json&country=netherlands" response, err := http.get(url) if err != nil { fmt.printf("%s\n", err) os.exit(1) } de
Read more

Django REST Framework perform_create: You cannot call `.save()` after accessing `serializer.data` -

-
i have following viewset: class artistprofileviewset(viewsets.modelviewset): queryset = artistprofile.objects.all() serializer_class = artistprofileserializer def perform_create(self, serializer): if serializer.is_valid(): serializer.save() with following serializers: class simpleartisttrackserializer(serializers.hyperlinkedmodelserializer): class meta: model = artisttrack fields = (...my fields...) class artistprofileserializer(serializers.hyperlinkedmodelserializer): owners = userserializer(many=true, required=false) tracks = simpleartisttrackserializer(many=true, required=false) class meta: model = artistprofile fields = (...my fields...) i getting following error: assertionerror: cannot call `.save()` after accessing `serializer.data`.if need access data before committing database inspect 'serializer.validated_data' instead. i don't see editing serializer.data object. th
Read more

python - Pygame. TypeError: 'pygame.Surface' object is not callable -

-
i new python, pygame, , coding in general. i not know why code getting: "typeerror: 'pygame.surface' object not callable" and black screen. here code: import pygame ptypeerror: 'pygame.surface' object not callableygame.init black = (0,0,0) white = (255,255,255) red = (255,0,0) green = (0,255,0) blue = (0,0,255) char_sprite = pygame.image.load("man.png") display_height = 800 display_width = 1000 dead = false framerate = 60 game_display = pygame.display.set_mode((display_width,display_height)) pygame.display.set_caption("tiny fighter") clock = pygame.time.clock() def char(x,y): game_dispaly.blit(char_sprite,(x,y)) x= display_width / 2 y= display_height / 2 while not dead: event in pygame.event.get(): if event.type == pygame.quit: dead = true game_display.fill(green) char_sprite(x,y) pygame.display.update() clock.tick(framerate) pygame.quit() quit() full traceback:
Read more