Allow items to determine their collection

[patrick-yi-82]

Example :
Set configuration

MONGODB_COLLECTION = 'my_items'
MONGODB_ITEM_COLLECTION="item_collection"

Item 1 : This item will go to the default collection my_items
{ "name":"John", "age":30}

Item 2 : This item will go to the collection teenager
{ "name":"Jane", "age":18, "item_collection": "teenager"}

[steve-bate]

👍 Why wasn't this ever merged?

[sebdah]

@steve-bate Not sure tbh. If you'd like to code review it I'll merge and ship it.