feat: add mapper for student and it loads

backend/adapters/orm.py

@@ -1,9 +1,12 @@
-from sqlalchemy import Column, MetaData, String, Table
-from sqlalchemy.orm import mapper
+from sqlalchemy import Column, ForeignKey, MetaData, String, Table
+from sqlalchemy.orm import backref, registry, relationship
 
+from backend.model.assessment import Assessment
+from backend.model.student import Student
 from backend.model.tribe import Tribe
 
 metadata = MetaData()
+mapper_registry = registry()
 
 tribes_table = Table(
     "tribes",
@@ -12,6 +15,35 @@ tribes_table = Table(
     Column("level", String(255)),
 )
 
+assessments_table = Table(
+    "assessments",
+    metadata,
+    Column("id", String(255), primary_key=True),
+    Column("name", String(255)),
+    Column("tribe_name", String(255), ForeignKey("tribes.name")),
+)
+
+students_table = Table(
+    "students",
+    metadata,
+    Column("id", String(255), primary_key=True),
+    Column("name", String(255)),
+    Column("tribe_name", String(255), ForeignKey("tribes.name")),
+)
+
 
 def start_mappers():
-    tribes_mapper = mapper(Tribe, tribes_table)
+    tribes_mapper = mapper_registry.map_imperatively(
+        Tribe,
+        tribes_table,
+        properties={
+            "students": relationship(
+                Student, backref="tribes", order_by=students_table.c.id
+            ),
+            "assessments": relationship(
+                Assessment, backref="tribes", order_by=assessments_table.c.id
+            ),
+        },
+    )
+    students_mapper = mapper_registry.map_imperatively(Student, students_table)
+    assessments_mapper = mapper_registry.map_imperatively(Assessment, assessments_table)