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  1. Core Server
  2. SERVER-1914

Does order of keys matter in hashes?

    Details

    • Type: Question
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Works as Designed
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
    • Labels:
      None

      Description

      I have this object that has an array of hashes representing addresses.

      See below:

      > db.customers.find(

      {"_id":"c098443ae4243643b189fc43e071a0a3"}

      )
      { "_id" : "c098443ae4243643b189fc43e071a0a3", "addresses" : [

      { "address1" : "18 W 18th Street", "address2" : "Floor 9", "city" : "New York", "companyName" : "The OpenSky Project", "country" : "US", "firstName" : "Matthew", "lastName" : "Fitzgerald", "phone" : "201-406-1869", "postalCode" : "10016", "slug" : "2fghj2x", "state" : "NY", "subtype" : 2, "type" : "customer" }

      ,

      { "address1" : "101 Main Street", "city" : "Middle America", "country" : "us", "firstName" : "Matthew", "lastName" : "Fitzgerald", "phone" : "201-406-1869", "phoneExtension" : "111", "postalCode" : "55555", "slug" : "fm8x", "state" : "KS", "type" : "customer" }

      ] }

      When I attempt to remove an address using "$pullAll" and unordered hash it does not remove it.

      Ex: This fails
      > db.customers.update(

      { "_id": "c098443ae4243643b189fc43e071a0a3" }

      ,
      { "$pullAll":
      { "addresses":
      [

      { "slug": "fm8x", "type": "customer", "firstName": "Matthew", "lastName": "Fitzgerald", "address1": "101 Main Street", "city": "Middle America", "state": "KS", "postalCode": "55555", "country": "us", "phone": "201-406-1869", "phoneExtension": "111" }

      ]
      }
      }
      )

      Ex: This succeeds

      > db.customers.update(

      { "_id": "c098443ae4243643b189fc43e071a0a3" }

      ,
      { "$pullAll":
      { "addresses":
      [

      { "address1": "101 Main Street", "city": "Middle America", "country": "us", "firstName": "Matthew", "lastName": "Fitzgerald", "phone": "201-406-1869", "phoneExtension": "111", "postalCode": "55555", "slug": "fm8x", "state": "KS", "type": "customer" }

      ]
      }
      }
      )

      Question: Does the order of keys in javascript hash objects matter or is it a MongoDB specific limitation? And what are the rules for ordering of keys in hashes in MongoDB (is it alphabetical by key). Is it ordered at all?

      Regards,
      Matt

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              • Created:
                Updated:
                Resolved: