Wrap items in a set call for Model.batch_get

[jmphilli]

Workaround to avoid triggering server validation error:

{
    "Error": {
        "Message": "Provided list of item keys contains duplicates",
        "Code": "ValidationException"
    }
}

This doesn't update the underlying connection.Table or connection.Base batch_get_item call.

[ikonst]

Fixed the test: #948

[Streadz]

+1

[sridhar562345]

Facing the below issue with batch_get, when JSONAttribute is used as hashkey

File "/home/user/Desktop/project_pynamo/venv/lib/python3.7/site-packages/pynamodb/models.py", line 338, in batch_get
    items = set(items)
TypeError: unhashable type: 'dict'

model

class UserMatchMap(Model):
    hash_key_compound_field = JSONAttribute(
        hash_key=True,
    )
   ...

sample data creation

hash_key_compound_field = {
            'user_id': 1,
            'status': "A",
            'game_id': 1
}

UserMatchMap(hash_key_compound_field=hash_key_compound_field).save()

Retrieving the hash keys using batch get raises the error

hash_key_compound_field = {
            'user_id': 1,
            'status': "A",
            'game_id': 1
}
UserMatchMap.batch_get(items=[hash_key_compound_field])

If we perform set on a list of dictionaries we face the above error.