added in publisher relationship (via book_publisher_link), removed debug, also removed ma.Nested, not needed?

main.py

@@ -17,6 +17,11 @@ book_author_link = db.Table('book_author_link', db.Model.metadata,
     db.Column('author_id', db.Integer, db.ForeignKey('author.id'))
 )
 
+book_publisher_link = db.Table('book_publisher_link', db.Model.metadata,
+    db.Column('book_id', db.Integer, db.ForeignKey('book.id')),
+    db.Column('publisher_id', db.Integer, db.ForeignKey('publisher.id'))
+)
+
 class Book(db.Model):
     id = db.Column(db.Integer, unique=True, nullable=False, primary_key=True)
     title = db.Column(db.String(100), unique=True, nullable=False)
@@ -31,9 +36,10 @@ class Book(db.Model):
     modified = db.Column(db.Date)
 
     author = db.relationship('Author', secondary=book_author_link)
+    publisher = db.relationship('Publisher', secondary=book_publisher_link)
 
     def __repr__(self):
-        return "<title: {}, id: {} author: {}>".format(self.title, self.id, self.author )
+        return "<title: {}, id: {}>".format(self.title, self.id )
 
 class Author(db.Model):
     id = db.Column(db.Integer, unique=True, nullable=False, primary_key=True)
@@ -43,9 +49,14 @@ class Author(db.Model):
     book = db.relationship('Book', secondary=book_author_link )
 
     def __repr__(self):
-        return "<firstnames: {}, surname: {}, book: {}>".format(self.firstnames, self.surname, self.book)
+        return "<firstnames: {}, surname: {}, id: {}>".format(self.firstnames, self.surname, self.id)
 
+class Publisher(db.Model):
+    id = db.Column(db.Integer, unique=True, nullable=False, primary_key=True)
+    name = db.Column(db.String(50), unique=False, nullable=False)
 
+    def __repr__(self):
+        return "<name: {}, id: {}>".format(self.name, self.id)
 
 ### setup serializer schemas, to make returning books/authors easier
 class AuthorSchema(ma.SQLAlchemyAutoSchema):
@@ -54,17 +65,21 @@ class AuthorSchema(ma.SQLAlchemyAutoSchema):
         include_relationships = True
         load_instance = True
 
+class PublisherSchema(ma.SQLAlchemyAutoSchema):
+    class Meta:
+        model = Publisher
+        include_relationships = True
+        load_instance = True
+
 class BookSchema(ma.SQLAlchemyAutoSchema):
-    author = ma.Nested(AuthorSchema, many=True)
     class Meta:
         model = Book
         include_relationships = True
         load_instance = True
 
-book_schema = BookSchema()
 author_schema = AuthorSchema()
-
+publisher_schema = PublisherSchema()
-print( book_schema )
+book_schema = BookSchema()
 
 ####################################### ROUTES #######################################
 @app.route("/books", methods=["GET"])

templates/books.html

@@ -23,7 +23,7 @@
         <tr>
 		  <td data-sort="{{book.id}}"><a href="/book/{{book.id}}">{{book.title}}</a></td>
 		  <td>{{ book.author[0]['surname'] }}, {{book.author[0]['firstnames']}}</td>
-		  <td>{{ book.publisher}}</td>
+		  <td>{{ book.publisher[0]['name']}}</td>
 		  <td align="center">
 		    {% if book.condition == "Good" %}
 				<i class="fas fa-book" style="color:black"></i>