Issue with distinct() operation on ListField of EmbeddedDocuments

[DirectX]

MongoEngine possible bug (tested on 0.8.4): the result of distinct() operation on ListField of EmbeddedDocuments is a list of dictionaries rather than list of EmbeddedDocuments as it works in previous versions of library. Here is an example.

from mongoengine import *

class Author(EmbeddedDocument):
    name = StringField()

class Book(Document):
    title = StringField()
    authors = ListField(EmbeddedDocumentField(Author))

def populate():
    Book.drop_collection()

    mark_twain = Author(name="Mark Twain")
    john_tolkien = Author(name="John Ronald Reuel Tolkien")

    book = Book(title="Tom Sawyer")
    book.authors.append(mark_twain)
    book.save()

    book = Book(title="The Lord of the Rings")
    book.authors.append(john_tolkien)
    book.save()

    book = Book(title="The Stories")
    book.authors.append(mark_twain)
    book.authors.append(john_tolkien)
    book.save()

if __name__ == "__main__":
    connect('test')
    populate()

    books = Book.objects()

    print "\nAll books:"

    print "\n".join(map(lambda b: b.title + " by " + " and ".join(map(lambda a: a.name, b.authors)), books))

    print "\nUnique authors (unexpected output):"

    authors = books.distinct("authors")

    for author in authors:
      print author["name"] + " (" + author.__class__.__name__ + ")"

    print "\nUnique authors (expected output):"

    authors = map(lambda a: Author(**a), authors)

    for author in authors:
      print author.name + " (" + author.__class__.__name__ + ")"

The output:

All books:
Tom Sawyer by Mark Twain
The Lord of the Rings by John Ronald Reuel Tolkien
The Stories by Mark Twain and John Ronald Reuel Tolkien

Unique authors (unexpected output):
Mark Twain (BaseDict)
John Ronald Reuel Tolkien (BaseDict)

Unique authors (expected output):
Mark Twain (Author)
John Ronald Reuel Tolkien (Author)

[rozza]

marking for 0.9

[rozza]

Sorry 0.8.x

[raonyguimaraes]

bump

[rozza]

Please don't bump its rude! Pull requests are the polite way to do it! ;)

All done and ready for 0.8.5