feat: add project_deps with get_project_by_id logic

src/backend/app/projects/project_deps.py

@@ -0,0 +1,45 @@
+# Copyright (c) 2022, 2023 Humanitarian OpenStreetMap Team
+#
+# This file is part of FMTM.
+#
+#     FMTM is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU General Public License as published by
+#     the Free Software Foundation, either version 3 of the License, or
+#     (at your option) any later version.
+#
+#     FMTM is distributed in the hope that it will be useful,
+#     but WITHOUT ANY WARRANTY; without even the implied warranty of
+#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#     GNU General Public License for more details.
+#
+#     You should have received a copy of the GNU General Public License
+#     along with FMTM.  If not, see <https:#www.gnu.org/licenses/>.
+#
+
+"""Project dependencies for use in Depends."""
+
+from fastapi import Depends
+from fastapi.exceptions import HTTPException
+from sqlalchemy.orm import Session
+
+from app.db.database import get_db
+from app.db.db_models import DbProject
+from app.models.enums import HTTPStatus
+
+
+async def get_project_by_id(
+    db: Session = Depends(get_db), project_id: int = None
+) -> DbProject:
+    """Get a single project by id."""
+    if not project_id:
+        # Skip if no project id passed
+        return None
+
+    db_project = db.query(DbProject).filter(DbProject.id == project_id).first()
+    if not db_project:
+        raise HTTPException(
+            status_code=HTTPStatus.NOT_FOUND,
+            detail=f"Project with ID {project_id} does not exist",
+        )
+
+    return db_project