Change session usage to on use basis.

classes/submission.py

@@ -6,9 +6,10 @@ from enum import Enum
 
 from nextcord import Embed
 from sqlalchemy import select
+from sqlalchemy.orm import Session
 
 # pylint: disable=import-error
-from utilities.sql_alchemy_connection import Category, CategoryGroup, session
+from utilities.sql_data_classes import Category, CategoryGroup, engine
 
 
 class SubmissionState(Enum):
@@ -199,14 +200,15 @@ class Submission:
             .where(CategoryGroup.GuildId == self.guild_id)
             .where(CategoryGroup.GroupId == self.group_id)
         )
-        embed.add_field(name="Group", value=session.scalar(stmt), inline=False)
-        if self.category_id:
-            stmt = (
-                select(Category.CategoryName)
-                .where(Category.GroupId == self.group_id)
-                .where(Category.CategoryId == self.category_id)
-            )
-            embed.add_field(name="Category", value=session.scalar(stmt), inline=False)
+        with Session(engine) as session:
+            embed.add_field(name="Group", value=session.scalar(stmt), inline=False)
+            if self.category_id:
+                stmt = (
+                    select(Category.CategoryName)
+                    .where(Category.GroupId == self.group_id)
+                    .where(Category.CategoryId == self.category_id)
+                )
+                embed.add_field(name="Category", value=session.scalar(stmt), inline=False)
         if self.score:
             embed.add_field(name="Score", value=self.score, inline=False)