def get(campaign_obj_id):
"""
Gets a campaign with the given id
:param campaign_obj_id:
:return:
"""
collection = Campaign.collection()
if campaign_obj_id is None:
return None
dic = collection.find_one({"_id": coerce_bson_id(campaign_obj_id)})
return Campaign.unserialize(dic) if dic is not None else None
