Fixes #9 - Some commands are deprecated.

src/05_pymongo/play_around_pymongo/program.py

@@ -5,7 +5,12 @@ client = pymongo.MongoClient(conn_str)
 
 db = client.the_small_bookstore
 
-if db.books.count() == 0:
+# NOTE: In the video we use db.books.count(), it's been deprecated for more explicit
+# versions. See
+# https://api.mongodb.com/python/current/api/pymongo/collection.html#pymongo.collection.Collection.estimated_document_count
+# for details
+
+if db.books.estimated_document_count() == 0:
     print("Inserting data")
     # insert some data...
     r = db.books.insert_one({'title': 'The third book', 'isbn': '73738584947384'})
@@ -23,7 +28,7 @@ else:
 # book = db.books.find_one({'isbn': '73738584947384'})
 # print(book)
 
-
+# NOTE: In the video we use db.books.update(), migrated to update_one() as update() is deprecated.
-db.books.update({'isbn': '181819884728473'}, {'$addToSet': {'favorited_by': 120}})
+db.books.update_one({'isbn': '181819884728473'}, {'$addToSet': {'favorited_by': 120}})
 book = db.books.find_one({'isbn': '181819884728473'})
 print(book)