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> db.foo.find()
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd454"), "foo" : 1 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd455"), "foo" : 2 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd456"), "foo" : 3 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd457"), "foo" : 4 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd458"), "foo" : 5 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd459"), "foo" : 6 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd45a"), "foo" : 7 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd45b"), "foo" : 8 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd45c"), "foo" : 9 }
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> db.foo.findAndModify( { query: {"foo" : 5}, update: {$set: {"bar" : 5 }} } )
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd458"), "foo" : 5 }
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> db.foo.findAndModify( { query: {"foo" :{ $gt : 5}}, update: {$set: {"bar" : 5 }} } )
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd459"), "foo" : 6 }
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> db.foo.find()
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd454"), "foo" : 1 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd455"), "foo" : 2 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd456"), "foo" : 3 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd457"), "foo" : 4 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd458"), "foo" : 5, "bar" : 5 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd459"), "foo" : 6, "bar" : 5 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd45a"), "foo" : 7 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd45b"), "foo" : 8 }
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{ "_id" : ObjectId("584b02d5f3cd9908f61fd45c"), "foo" : 9 }
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