How to avoid O(n+1) problem with peewee object?

I have these following models in peewee:

db.py

class Item(BaseModel):    item_id = IntegerField()    item_name = CharField()class Sales(BaseModel):    sales_id = IntegerField()class SalesItem(BaseModel):    sales_item_id = Integer_Field()    sales = ForeignKeyField(Sales, backref='items')    item = ForeignKeyField(Item)

view.py

templates = Jinja2Templates(directory="templates")def html_get(request, sales_id):    sales = Sales.get(Sales.sales_id==sales_id)    return templates.templateResponse('view_sales.html',{'sales':sales})

view_sales.html

Sales: {{ sales.sales_id }}Items: {% for it in sales.items %}<div>{{ it.item.item_name }}</div>{% endfor %}

The problem is the query sales = Sales.get(Sales.sales_id==sales_id) generates O(n+1) queries to get to each item's name. I have tried to create the join sales = Sales.select(Sales,SalesItem,Item).join(SalesItem).join(Item).where(Sales.sales_id==sales_id) but it also generates O(n+1) queries.

I looked into using prefetch, but couldn't get it to work. Any idea how to reduce the queries to O(k) where k=number of tables?