Максим Барабанов

chiefs_by = Person.objects.filter(chief_id=person.id)

class Person(...):
  ...
  department = models.ManyToManyField('Department', verbose_name='подразделение', throught='PersonInDepartment')

class Department(..):
  chief = models.ForeignKeyField(Person,....)
  ...

class PersonInDepartment(...):
   person = ForeignKey
   department = ForeignKey
   position = ForeignKey

var myMap = new ymaps.Map('map', {
  center: [55.76, 37.64], 
  zoom: 10,
  controls: ['zoomControl']
}, {
   searchControlProvider: 'yandex#search'
});

function init () {
  if(myMap)
    myMap.geoObjects.removeAll();
  objectManager = new ymaps.ObjectManager({
    clusterize: true,
    gridSize: 32
  });
  objectManager.objects.options.set('preset', 'islands#darkGreenCircleDotIcon');
  objectManager.clusters.options.set('preset', 'islands#invertedDarkGreenClusterIcons');
  myMap.geoObjects.add(objectManager);

  $.ajax({
    url: "1.json"
  }).done(function(data) {
    objectManager.add(data);
  });
}

l = int((image.size[0] - w) / 2)
t = int((image.size[1] - h) / 2)