writing: fix code blocks in sqlalchemy section

Author: jslvtr

docs/docs/06_sql_storage_sqlalchemy/05_insert_models_sqlalchemy/README.md

@@ -14,6 +14,13 @@ description: Learn how to use SQLAlchemy to add new rows to our SQL database.
 Inserting models with SQLAlchemy couldn't be easier! We'll use the `db.session`[^1] variable to `.add()` a model. Let's begin working on our `Item` resource:
 
 ```python title="resources/item.py"
+from sqlalchemy.exc import SQLAlchemyError
+
+from db import db
+from models import ItemModel
+
+...
+
 @blp.arguments(ItemSchema)
 @blp.response(201, ItemSchema)
 def post(self, item_data):
@@ -31,6 +38,13 @@ def post(self, item_data):
 Similarly in our `Store` resource:
 
 ```python title="resources/store.py"
+from sqlalchemy.exc import SQLAlchemyError, IntegrityError
+
+from db import db
+from models import StoreModel
+
+...
+
 @blp.arguments(StoreSchema)
 @blp.response(201, StoreSchema)
 def post(self, store_data):

docs/docs/06_sql_storage_sqlalchemy/07_updating_models_sqlalchemy/README.md

@@ -21,17 +21,17 @@ This idempotency is frequently seen with `PUT` requests. You can see it in actio
 @blp.arguments(ItemUpdateSchema)
 @blp.response(200, ItemSchema)
 def put(self, item_data, item_id):
-    item = ItemModel.query.get_or_404(item_id)
     # highlight-start
+    item = ItemModel.query.get(item_id)
     if item:
         item.price = item_data["price"]
         item.name = item_data["name"]
     else:
-        item = ItemModel(**item_data)
+        item = ItemModel(id=item_id, **item_data)
 
     db.session.add(item)
     db.session.commit()
 
     return item
     # highlight-end
-```
+```

docs/docs/06_sql_storage_sqlalchemy/10_conclusion/README.md

@@ -30,7 +30,7 @@ class ItemModel(db.Model):
     __tablename__ = "items"
 
     id = db.Column(db.Integer, primary_key=True)
-    name = db.Column(db.String(80), unique=True, nullable=False)
+    name = db.Column(db.String(80), unique=False, nullable=False)
     price = db.Column(db.Float(precision=2), unique=False, nullable=False)
 
     store_id = db.Column(
@@ -92,6 +92,7 @@ class ItemSchema(PlainItemSchema):
 class ItemUpdateSchema(Schema):
     name = fields.Str()
     price = fields.Float()
+    store_id = fields.Int()
 
 
 class StoreSchema(PlainStoreSchema):