MongoUserDict

mongo_objects allows us to create our own class for viewing these event documents:

class Event( mongo_objects.MongoUserDict ):

    db = ...     # provide your pymongo database object here
    collection_name = 'events'

    def isFuture( self ):
        return self['date'] >= datetime.utcnow()

Loop through all events:

for event in Event.find():
    ...

Create a new event:

myevent = Event( {
    'name' : '...',
    'date' : '...',
} )
myevent.save()

Record the unique ID (ObjectId) of an event:

eventId = myevent.id()

Locate an event by its ID:

myevent = Event.load_by_id( eventId )

Call a method on our custom object:

myevent.isFuture()

MongoDictProxy

mongo_objects allows us to create additional proxy classes for managing subdocuments. The proxy classes behave like dictionaries but redirect all access back to the parent MongoUserDict object. No additional database access is performed.:

class TicketTypes( mongo_objects.MongoDictProxy ):
    container_name = 'ticketTypes'

First load an Event document object:

event = Event.find_one()

Loop through the existing ticket type subdocuments within the parent Event:

for tt in TicketTypes.get_proxies( event ):
    ...

Obtain a specific proxy by key:

tt = TicketType.get_proxy( event, '1' )

Get the unique ID of a proxy item:

ticket_type_id = tt.id()

Loading a proxy object by ID is a classmethod of the parent document class; the proxy can only exist once the parent document is loaded:

tt = Event.load_proxy_by_id( ticket_type_id, TicketTypes )

Create a new ticket type. A unique per-document key will be assigned automatically:

TicketType.create( event, {
    'name' : 'Student Ticket',
    'desc' : 'For our student friends',
    'cost' : 50,
    'quantity' : 25,
} )

Credits

Development sponsored by Headwaters Entrepreneurs Pte Ltd.

Originally developed by Frontier Tech Team LLC for the Wasted Minutes ™️ language study tool.

License

mongo_objects is made available to the community under the “MIT License”.