docs: def get_collections_for_image(self, image_id):
          """Get identifier of all collections that contain a given image.
  
          Parameters
          ----------
          image_id : string
              Unique identifierof image object
  
          Returns
          -------
          List(string)
              List of image collection identifier
          """
          result = []
          # Get all active collections that contain the image identifier
          for document in self.collection.find({'active' : True, 'images.identifier' : image_id}):
              result.append(str(document['_id']))
          return result