feat: nested department sections, attaching department sections in the user editor

services/department.py

@@ -1,19 +1,25 @@
-from typing import Optional
-
-from sqlalchemy import select, and_
+from sqlalchemy import select, and_, delete, or_
 from sqlalchemy.orm import selectinload
 
-from models import Department, DepartmentSection, User, user_department_section
+from models import Department, DepartmentSection, User, UserDepartmentSection
 from schemas.department import *
 from services.base import BaseService
 
 
 class DepartmentService(BaseService):
     async def get_departments(self) -> GetDepartmentsResponse:
+        sections_selectinload = selectinload(Department.sections)
+        for _ in range(10):
+            sections_selectinload = sections_selectinload.selectinload(DepartmentSection.sections)
+
         stmt = (
             select(Department)
             .options(
-                selectinload(Department.sections).selectinload(DepartmentSection.users)
+                sections_selectinload,
+                selectinload(Department.sections)
+                .selectinload(DepartmentSection.users)
+                .selectinload(UserDepartmentSection.user)
+                .noload(User.department_sections),
             )
             .order_by(Department.name)
         )
@@ -67,6 +73,11 @@ class DepartmentService(BaseService):
         await self.session.commit()
         return DeleteDepartmentResponse(ok=True, message="Департамент успешно удален")
 
+    async def get_sections(self) -> GetDepartmentSectionsResponse:
+        stmt = select(DepartmentSection)
+        sections = (await self.session.execute(stmt)).scalars().all()
+        return GetDepartmentSectionsResponse(department_sections=sections)
+
     async def _get_section(self, filter_condition) -> Optional[DepartmentSection]:
         stmt = (
             select(DepartmentSection)
@@ -76,21 +87,40 @@ class DepartmentService(BaseService):
         departments = (await self.session.execute(stmt)).one_or_none()
         return departments[0] if departments else None
 
-    async def _get_section_by_name(self, name: str, department_id: int) -> Optional[DepartmentSection]:
+    async def _get_section_by_name(
+            self,
+            name: str,
+            department_id: int = None,
+            parent_section_id: int = None,
+    ) -> Optional[DepartmentSection]:
         return await self._get_section(and_(
             DepartmentSection.name == name,
-            DepartmentSection.department_id == department_id,
+            and_(
+                or_(department_id is None, DepartmentSection.department_id == department_id),
+                or_(parent_section_id is None, DepartmentSection.parent_department_section_id == parent_section_id),
+            )
         ))
 
     async def _get_section_by_id(self, section_id: int) -> Optional[DepartmentSection]:
         return await self._get_section(DepartmentSection.id == section_id)
 
     async def create_department_section(self, request: CreateDepartmentSectionRequest) -> CreateDepartmentSectionResponse:
-        section = await self._get_section_by_name(request.section.name, request.section.department_id)
+        section = await self._get_section_by_name(
+            request.section.name,
+            department_id=request.section.department_id,
+            parent_section_id=request.section.parent_department_section_id,
+        )
         if section:
-            return CreateDepartmentSectionResponse(ok=False, message="Отдел с таким названием уже существует в департаменте")
+            return CreateDepartmentSectionResponse(
+                ok=False,
+                message="Отдел с таким названием уже существует в департаменте",
+            )
 
-        section = DepartmentSection(name=request.section.name, department_id=request.section.department_id)
+        section = DepartmentSection(
+            name=request.section.name,
+            department_id=request.section.department_id,
+            parent_department_section_id=request.section.parent_department_section_id,
+        )
         self.session.add(section)
         await self.session.commit()
         return CreateDepartmentSectionResponse(ok=True, message="Отдел успешно создан")
@@ -99,6 +129,14 @@ class DepartmentService(BaseService):
         section = await self._get_section_by_id(request.section.id)
         if not section:
             return UpdateDepartmentSectionResponse(ok=False, message=f"Отдел с ID {request.section.id} не найден")
+        if section.name != request.section.name:
+            section_same_name = await self._get_section_by_name(
+                request.section.name,
+                department_id=request.section.department_id,
+                parent_section_id=request.section.parent_department_section_id,
+            )
+            if section_same_name:
+                return UpdateDepartmentSectionResponse(ok=False, message="Отдел с данным именем уже существует")
 
         section.name = request.section.name
         await self.session.commit()
@@ -106,9 +144,9 @@ class DepartmentService(BaseService):
 
     async def get_available_users_for_section(self, section_id: int) -> GetAvailableUsersForDepartmentSectionResponse:
         sub_user_ids_in_section = (
-            select(user_department_section.c.user_id.label("user_id"))
-            .where(user_department_section.c.department_section_id == section_id)
-            .group_by(user_department_section.c.user_id)
+            select(UserDepartmentSection.user_id.label("user_id"))
+            .where(UserDepartmentSection.section_id == section_id)
+            .group_by(UserDepartmentSection.user_id)
             .subquery()
         )
         stmt = (
@@ -141,10 +179,22 @@ class DepartmentService(BaseService):
             return False, f"Пользователь с ID {request.user_id} не найден"
 
         if is_adding:
-            section.users.append(user)
+            user_department_section = UserDepartmentSection(
+                user_id=request.user_id,
+                section_id=section.id,
+                is_chief=request.is_chief,
+            )
+            section.users.append(user_department_section)
             message = f"Пользователь успешно добавлен в отдел"
         else:
-            section.users.remove(user)
+            delete_stmt = (
+                delete(UserDepartmentSection)
+                .where(and_(
+                    UserDepartmentSection.user_id == request.user_id,
+                    UserDepartmentSection.section_id == request.section_id,
+                ))
+            )
+            await self.session.execute(delete_stmt)
             message = f"Пользователь успешно удален из отдела"
 
         await self.session.commit()