@staticmethod
def find(collection, query):
    return Database.DATABASE[collection].find(query)

@classmethod
def all(cls):
    return [cls(**elem) for elem in Database.find(ItemConstants.COLLECTION, {})]

@classmethod
def get_by_parameters(cls, name, category, url, size):
    return [cls(**elem) for elem in Database.find(ItemConstants.COLLECTION,
                                                  {"name": name, "category": category, "url": url,
                                                   "size": size}).sort('time', pymongo.DESCENDING).limit(1)][0]

@staticmethod
def find_min(collection, query, column):
    Database.DATABASE[collection].find(query).sort({column: pymongo.ASCENDING}).limit(1)

@classmethod
def get_by_parameters(cls, name, category, url, size):
    return cls(**Database.find_min(ItemConstants.COLLECTION,
                                   {"name": name, "category": category, "url": url,
                                    "size": size}, 'time'))