Fixed problem with the albums link when no artist is supplied. Also added...

Fixed problem with the albums link when no artist is supplied. Also added raising an exception if no .env file is found

python-sqlite-sqlalchemy/project/examples/example_1/main.py

@@ -36,7 +36,7 @@ def get_books_by_publisher(data, ascending=True):
 
 
 def get_authors_by_publisher(data, ascending=True):
-    """Returns the authors by the associated publisher as a Panda series
+    """Returns the authors by the associated publisher as a pandas series
 
     Args:
         data: The pandas dataframe to get the data from

python-sqlite-sqlalchemy/project/examples/example_3/app/albums/routes.py

@@ -38,14 +38,18 @@ class CreateAlbumForm(FlaskForm):
 def albums(artist_id=None):
     form = CreateAlbumForm()
 
-    # Get the artist
-    artist = (
-        db.session.query(Artist)
-        .filter(Artist.artist_id == artist_id)
-        .one_or_none()
-    )
-
-    form.artist.data = artist.name
+    # did we get an artist id?
+    if artist_id is not None:
+        # Get the artist
+        artist = (
+            db.session.query(Artist)
+            .filter(Artist.artist_id == artist_id)
+            .one_or_none()
+        )
+        form.artist.data = artist.name
+    # otherwise, no artist
+    else:
+        artist = None
 
     # Is the form valid?
     if form.validate_on_submit():

python-sqlite-sqlalchemy/project/examples/example_3/config.py

@@ -4,7 +4,11 @@ from pathlib import Path
 from dotenv import load_dotenv
 
 # Load the environment variables from .env file
-load_dotenv()
+path = Path(__file__).parent / ".env"
+if path.exists():
+    load_dotenv()
+else:
+    raise IOError(".env file not found")
 
 
 class Config: