52 - Loading Related data with sqlalchemy joinloaded

Author: codingforentrepreneurs

full_stack_python/blog/list.py

@@ -15,13 +15,15 @@ def blog_post_detail_link(child: rx.Component, post: BlogPostModel):
     post_detail_url = f"{root_path}/{post_id}"
     return rx.link(
         child,
+        rx.heading("by ", post.userinfo.email),
         href=post_detail_url
     )
 
 def blog_post_list_item(post: BlogPostModel):
     return rx.box(
         blog_post_detail_link(
             rx.heading(post.title),
+            
             post
         ),
         padding='1em'

full_stack_python/blog/state.py

@@ -2,11 +2,12 @@
 from typing import Optional, List
 import reflex as rx 
 
+import sqlalchemy
 from sqlmodel import select
 
 from .. import navigation
 from ..auth.state import SessionState
-from ..models import BlogPostModel
+from ..models import BlogPostModel, UserInfo
 
 BLOG_POSTS_ROUTE = navigation.routes.BLOG_POSTS_ROUTE
 if BLOG_POSTS_ROUTE.endswith("/"):
@@ -39,14 +40,15 @@ def get_post_detail(self):
             if self.blog_post_id == "":
                 self.post = None
                 return
-            result = session.exec(
-                select(BlogPostModel).where(
-                    (BlogPostModel.id == self.blog_post_id)
-                )
-            ).one_or_none()
-            if result.userinfo: # db lookup
-                print('working')
-                # result.userinfo.user
+            sql_statement = select(BlogPostModel).options(
+                sqlalchemy.orm.joinedload(BlogPostModel.userinfo).joinedload(UserInfo.user)
+            ).where(
+                (BlogPostModel.id == self.blog_post_id)
+            )
+            result = session.exec(sql_statement).one_or_none()
+            # if result.userinfo: # db lookup
+            #     print('working')
+            #     result.userinfo.user # db lookup
             self.post = result
             if result is None:
                 self.post_content = ""
@@ -65,7 +67,9 @@ def load_posts(self, published_only=False):
             )
         with rx.session() as session:
             result = session.exec(
-                select(BlogPostModel).where(
+                select(BlogPostModel).options(
+                    sqlalchemy.orm.joinedload(BlogPostModel.userinfo)
+                ).where(
                    *lookup_args
                 )
             ).all()