Update 4. Aggregation Pipelines: Let the Server Do It For You.md

Author: ortizfram

Introduction to MongoDB in Python/4. Aggregation Pipelines: Let the Server Do It For You.md

@@ -191,3 +191,20 @@ pipeline = [
 ]
 for doc in db.prizes.aggregate(pipeline): print(doc)
 ```
+## 🦍 "...it's the life in your years"
+For the pipeline we developed in the last slide deck, I want you to replace the last ($bucket) stage with one such that, given the documents docs collected, we can get the following output:
+
+      from operator import itemgetter
+
+      print(max(docs, key=itemgetter("years")))
+      print(min(docs, key=itemgetter("years")))
+
+      {'firstname': 'Rita', 'surname': 'Levi-Montalcini', 'years': 103.0}
+      {'firstname': 'Martin Luther', 'surname': 'King Jr.', 'years': 39.0}
+You may assume that any earlier $project stage has been replaced by an equivalent $addFields stage
+
+Possible Answers
+- [x] {"$project": {"years": 1, "firstname": 1, "surname": 1, "_id": 0}}
+- [ ] {"$addFields": {"firstname": 1, "surname": 1}}
+- [ ] {"$project": {"firstname": 1, "surname": 1}}
+- [ ] {"$project": {"firstname": 1, "surname": 1, "_id": 0}}