How I know my document's size inside MongoDB with the ruby driver

The limitation of one document in MongoDB is 4Mo. I have some documents really heavy with a lot of data.

How 开发者_StackOverflowI know my document's size inside MongoDB with the ruby driver ?

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Or native Object.bsonsize(db.Foo.findOne());

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You can use BSON.serialize and find the length of the resulting byte buffer. See http://www.mongodb.org/display/DOCS/BSON#BSON-Ruby for an example of using BSON.serialize.