Property domain service class

As with other domain service classes described earlier in this book, we'll create a folder called /path/to/repo/chapters/07/src/booksomeplace/domain. The filename is property.py, while the class is PropertyService, which extends Base:

# booksomeplace.domain.property
import pymongo
from pymongo.cursor import CursorType
from booksomeplace.domain.base import Base
from booksomeplace.entity.base import Name, Contact, Location
from booksomeplace.entity.property import Property, PropInfo, Review, RoomType
class PropertyService(Base) :
    collectName = 'properties'

Next, we define a method called fetchByKey() that returns a single Property instance based on key lookup:

    def fetchByKey(self, key) :
        query  = {'propertyKey':key}
        result = self.collection.find_one(query)
        if result :
            return self.assemble(result)
        else :
            return None

After that, we define a method called fetchTop10() that...