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  1. Core Server
  2. SERVER-8088

$unwind of non-array should be allowed

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Details

    • Bug
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 3.1.0
    • Aggregation Framework
    • None
    • Minor Change
    • ALL

    Description

      This would effectively just output the existing field.

      > db.reg.find()
      { "_id" : 1, "text" : "foo" }
      { "_id" : 2, "text" : "bar" }
      { "_id" : 3, "text" : "Bar" }
      { "_id" : 4, "text" : [ "bar", "foo" ] }
      >db.reg.aggregate({$match:{text:/ba/i}}, {$unwind:"$text"})
      ...
      	"errmsg" : "exception: $unwind:  value at end of field path must be an array",
      	"code" : 15978,
      	"ok" : 0

      This will be important for collections where some document fields may be arrays, but some may not.

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              eliot Eliot Horowitz (Inactive)
              scotthernandez Scott Hernandez
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                Created:
                Updated:
                Resolved: