{"discipline":"Mathematiques","date":"2017-12-03"}

def cours_list(request):
    if request.method == 'POST':

       data = JSONParser().parse(request)

       serializer = LessonSerializer(data=data)

       if serializer.is_valid():
          serializer.save()
          return JSONResponse(serializer.data, status=201)

       return JSONResponse(serializer.errors, status=400)

class Discipline(models.Model):
    name = models.CharField(max_length=200)


class Lesson(models.Model):
    discipline = models.ForeignKey(Discipline, on_delete=models.CASCADE)
    date = models.DateField()
    regular_slot = models.BooleanField(default=False)

class DisciplineSerializer(serializers.ModelSerializer):
    class Meta:
        model = Discipline
        fields = ('name')

class LessonSerializer(serializers.ModelSerializer):
    discipline = serializers.RelatedField(source='Discipline', read_only=True);
    class Meta:
       model = Lesson
       fields = ('discipline', 'date', 'regular_slot')