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Operating System:
Windows
Steps To Reproduce:

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I'm using the following script:

colls = db.getCollectionNames();
for (x in colls) {
db.dump.insert(
{x : colls[x]}
) ;
};

expected:
>db.dump.find()
{ "_id" : ObjectId("511917a423ebdaf55649e5ba"), "1" : "xxx" } { "_id" : ObjectId("511917a423ebdaf55649e5ba"), "2" : "xxx1" } { "_id" : ObjectId("511917a423ebdaf55649e5ba"), "3" : "xxx2" }
....
{ "_id" : ObjectId("511917a423ebdaf55649e5bb"), "12" : "system.indexes" }
actual:
>db.dump.find()
{ "_id" : ObjectId("511917a423ebdaf55649e5ba"), "x" : "xxx" } { "_id" : ObjectId("511917a423ebdaf55649e5bb"), "x" : "system.indexes" }

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I'm using the following script: colls = db.getCollectionNames(); for (x in colls) { db.dump.insert( {x : colls[x]} ) ; }; expected: >db.dump.find() { "_id" : ObjectId("511917a423ebdaf55649e5ba"), "1" : "xxx" } { "_id" : ObjectId("511917a423ebdaf55649e5ba"), "2" : "xxx1" } { "_id" : ObjectId("511917a423ebdaf55649e5ba"), "3" : "xxx2" } .... { "_id" : ObjectId("511917a423ebdaf55649e5bb"), "12" : "system.indexes" } actual: >db.dump.find() { "_id" : ObjectId("511917a423ebdaf55649e5ba"), "x" : "xxx" } { "_id" : ObjectId("511917a423ebdaf55649e5bb"), "x" : "system.indexes" }

it seems that 'for' works not properly. I've tried 'for in' and usual 'for (x=0;x < 12; x++)' operations. Please see my steps to reproduce.

PS: xxx, xxx1, xxx2 ... system.indexes are collections in my DB

Thank you!