Post on 18-May-2015
Our Adventure WithMongoDB, Rails & Friends
Mongo ChicagoOctober 2010
Ethan Gundersonhttp://ethangunderson.com
Twitter & Github: ethangunderson
Our Agenda1) gathers.us2) Why Mongo3) Choosing an ODM4) Data modeling5) Takeaways6) Q & A
Manage events
Manage your groups(coming soon)
Aggregate your social content(coming soon)
High ValueGroupsEventsRSVPs
Low ValueSocial Events
Data needs
Our Agenda1) gathers.us2) Why Mongo3) Choosing an ODM4) Data modeling5) Takeaways6) Q & A
Document data model
Read heavy
Reads
Writes
Scaling With MongoDB - 2:45
The real reasonI won an argument
Our Agenda1) gathers.us2) Why Mongo?3) Choosing an ODM4) Data modeling5) Takeaways6) Q & A
Rails loves
MongoMapperMogoDoc
MongoidMongomatic
Candy
Lotʼs of options for Rails integration
The strait Mongo Ruby driver!We chose ...
ORMs are worthless if you donʼt understand what theyʼre doing.
Simple to use
Learn your tools
We avoided one until it became too painful not to use one.
In the end, we choseMongoid
Rails 3 support
Nice query syntax
Safe mode
Master / Slave
Rapid development
Our Agenda1) gathers.us2) Why Mongo3) Choosing an ODM4) Data modeling5) Takeaways6) Q & A
Our data model
Introducing groups
Option 1
Option 2
YEAH!!
This idea actually sucks
Mongoʼs 4MB 8MB document limit
Among other things, it keeps people like us, from doing things like that.
In reality, documents shouldnʼt be bigger than ~250kb
1) updating on the server2) transferring across the network3) serializing to and from BSON
Inefficient when...
Querying for single eventsCan’t pull back a single event
Option 3single collection inheritance
Mongoid Support
Mongoid Support
Easy querying
Top level objects are stilltop level objects
Moral of the story is,data modeling is still hard
Our Agenda1) gathers.us2) Why Mongo3) Choosing an ODM4) Data modeling5) Takeaways6) Q & A
Takeaways1) Analyze your data needs2) Learn the API3) Data modeling is (still) hard
Our Agenda1) gathers.us2) Why Mongo3) Choosing an ODM(?)4) Data modeling5) Takeaways6) Q & A