ren@ren-desktop ~/mongo-copy $ ./mongo
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MongoDB shell version: 2.6.0-rc1-pre-
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connecting to: test
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> db.user.insert( { "": 3 })
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WriteResult({ "nInserted" : 1 })
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> db.user.find()
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{ "_id" : ObjectId("531f798aa676eb5ad3d44332"), "a" : { "" : 2 } }
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{ "_id" : ObjectId("531f7a27a676eb5ad3d44333"), "" : 2 }
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{ "_id" : ObjectId("531f7a3248b214d47bdddd04"), "" : 3 }
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> db.user.update({ }, { "": 4 })
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WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
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> db.user.find()
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{ "_id" : ObjectId("531f798aa676eb5ad3d44332"), "" : 4 }
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{ "_id" : ObjectId("531f7a27a676eb5ad3d44333"), "" : 2 }
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{ "_id" : ObjectId("531f7a3248b214d47bdddd04"), "" : 3 }
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> db.user.ensureIndex({ "": 1 })
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WriteResult({
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"nInserted" : 0,
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"writeError" : {
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"code" : 67,
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"errmsg" : "bad index key pattern { : 1.0 }: Index keys cannot be an empty field."
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}
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})
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> db.user.ensureIndex({ "a.": 1 })
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WriteResult({
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"nInserted" : 0,
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"writeError" : {
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"code" : 67,
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"errmsg" : "bad index key pattern { a.: 1.0 }: Index keys cannot contain an empty field."
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}
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})
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> db.user.find({ "": 3 })
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{ "_id" : ObjectId("531f7a3248b214d47bdddd04"), "" : 3 }
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