Here is BSON from one of our corrupted records https://raw.github.com/gist/ad402de2e594055d245e/a50138ca1e901a7b277bd174a976b4dacec5b52a/gistfile1.txt

Our object structure (specified only broken key):

How it should be:

{
...
  'offers': {
     'last_offer': Date
     'list': [
       {...},
       {...}
     ]
  }
...
}

How it actually is in BSON above:

{
...
  'offers': {
     'last_offer': Date
     'list': [
       {...},
       {...}
     ],
     'list': {
        '0':{ # can be any idx
           ...
        }
     }
  }
...
}

YES, 2 same keys in one object with different values, in bson: `\x04list ... \x03list`. First is array and second is hash.

Due different driver realisations mongo console returns first version, and ruby driver returns second (hash).

I tried to run `db.collection.validate(true)` but mongo did't show errors.

Here is our usage, that can cause it:

We have 2 different scripts, both use ruby. One script makes $push to 'offers.list', and second script do $set on array member "offers.list.#

" it creates new version of this field which looks like "offers": {"list": { idx:

} }, so it creates new hash instead of modifying array.

Frankly i cant really understand if its driver, bson gem, or mongo issue.