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Dumping PyMongo cursor does not serialize first item #303

Mise opened this Issue Oct 15, 2015 · 0 comments


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Mise commented Oct 15, 2015

We are currently trying to upgrade Marshmallow from version 1.1.0 to the latest version. As our internal tests started failing we discovered a commit that breaks serializing PyMongo cursors. The commit is 48903a3.

Changing obj_prototype = obj[0] to obj_prototype = next(iter(obj)) causes the cursor position to change. When the serialization in the subsequent steps progresses the first item will not be serialized (as the cursor now points to the next item).


  • Converting the cursor to a list before passing it to dump().
  • Setting update_fields = False when calling dump().

@sloria sloria closed this Oct 16, 2015

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