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  1. Core Server
  2. SERVER-12356

Error object is being returned to shell is displayed as [object Object]

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: 2.5.4
    • Fix Version/s: 2.5.5
    • Component/s: Shell
    • Labels:
      None
    • Operating System:
      ALL

      Description

      Testing done against 2.5.5-pre (built off master)

      git version: cec1b16a90acadf97b892a56fb15943a72f04398

      // insert a few objects like this one
      > db.foo.findOne()
      { "_id" : ObjectId("52d4b437ec0439c7ad81e069"), "a" : 4 }
       
      // multi update with $mul works on all 4
      > db.foo.update({}, {$mul : {a : 2}}, false, true)
      SingleWriteResult({
      	"writeErrors" : [ ],
      	"writeConcernErrors" : [ ],
      	"nInserted" : 0,
      	"nUpserted" : 0,
      	"nUpdated" : 4,
      	"nModified" : 4,
      	"nRemoved" : 0,
      	"upserted" : [ ]
      })
      // now insert a string
      > db.foo.insert({a : "x"})
      SingleWriteResult({
      	"writeErrors" : [ ],
      	"writeConcernErrors" : [ ],
      	"nInserted" : 1,
      	"nUpserted" : 0,
      	"nUpdated" : 0,
      	"nModified" : 0,
      	"nRemoved" : 0,
      	"upserted" : [ ]
      })
      // retry the update, expecting an error
      > db.foo.update({}, {$mul : {a : 2}}, false, true)
      SingleWriteResult({
      	"writeErrors" : [
      		[object Object]
      	],
      	"writeConcernErrors" : [ ],
      	"nInserted" : 0,
      	"nUpserted" : 0,
      	"nUpdated" : 0,
      	"nModified" : 0,
      	"nRemoved" : 0,
      	"upserted" : [ ]
      })
      // checking the previous error gives us the actual error
      > db.getPrevError()
      {
      	"err" : "Cannot apply $mul to a value of non-numeric type. {_id: ObjectId('52d4b44eec0439c7ad81e06d')} has the field 'a' of non-numeric type String",
      	"code" : 16837,
      	"n" : 0,
      	"nPrev" : 2,
      	"ok" : 1
      }

      It's also worth noting that the nUpdated and nModified values are 0 when in fact the multiply operation was successful. Evidence:

      > db.foo.find()
      { "_id" : ObjectId("52d4b437ec0439c7ad81e069"), "a" : 64 }
      { "_id" : ObjectId("52d4b43aec0439c7ad81e06a"), "a" : 48 }
      { "_id" : ObjectId("52d4b43cec0439c7ad81e06b"), "a" : 32 }
      { "_id" : ObjectId("52d4b43dec0439c7ad81e06c"), "a" : 16 }
      { "_id" : ObjectId("52d4b44eec0439c7ad81e06d"), "a" : "x" }
      { "_id" : ObjectId("52d4b63dec0439c7ad81e06e"), "a" : "y" }
      > db.foo.update({}, {$mul : {a : 2}}, false, true)
      SingleWriteResult({
      	"writeErrors" : [
      		[object Object]
      	],
      	"writeConcernErrors" : [ ],
      	"nInserted" : 0,
      	"nUpserted" : 0,
      	"nUpdated" : 0,
      	"nModified" : 0,
      	"nRemoved" : 0,
      	"upserted" : [ ]
      })
      // 0 modified or updated, but if we check the values again we can see the successful modification of the 4 numeric fields
      > db.foo.find()
      { "_id" : ObjectId("52d4b437ec0439c7ad81e069"), "a" : 128 }
      { "_id" : ObjectId("52d4b43aec0439c7ad81e06a"), "a" : 96 }
      { "_id" : ObjectId("52d4b43cec0439c7ad81e06b"), "a" : 64 }
      { "_id" : ObjectId("52d4b43dec0439c7ad81e06c"), "a" : 32 }
      { "_id" : ObjectId("52d4b44eec0439c7ad81e06d"), "a" : "x" }
      { "_id" : ObjectId("52d4b63dec0439c7ad81e06e"), "a" : "y" }

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              • Created:
                Updated:
                Resolved: