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126

answers:

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+2  Q: 

MongoMapper docs

Does anyone have a good resource for MongoMapper documentation? I've been reading through the mongoDB docs, but a lot of it doesn't convert across to ruby/mm. I've been trying to figure out how to do a SELECT FROM WHERE EXISTS with little success.

db.things.find( { a : { $exists : true } } ); // return object if a is present

The only docs I've found so far these which have helped a little.

Thanks.

+2  A: 

Here is the three good pdf link which will guide you how to store files,retrieve files,twitter schema,followers, insert,update and many more..........

First Pdf - MongoDb by Kristina

MongoDb by Kyle

MongoDb by Mathias Stearn

Rupeshit
Thanks, these are great, especially the one by Kristina.
Aaron Moodie
If you like this then please accept the answer.....
Rupeshit