adision de bases para trabajo completo de back-v1.0.0

app/modules/feed/service.py

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+from sqlalchemy.orm import Session
+from datetime import datetime
+from typing import Optional
+from fastapi import HTTPException
+from app.modules.feed.models import Feed
+from app.modules.feed.schema import FeedCreate, FeedResponse, FeedUpdate, messageResponse
+
+
+class FeedService:
+    @staticmethod
+    def create_feed(db: Session, data: FeedCreate ):
+        new_feed = Feed(**data.dict())
+        db.add(new_feed)
+        db.commit()
+        db.refresh(new_feed)
+        return new_feed
+
+    @staticmethod
+    def get_feed(db: Session, feed_id: int, current_user):
+        feed = db.query(Feed).filter(Feed.id == feed_id).first()
+        if not feed:
+            raise ValueError("feed no encontrado")
+        return feed
+
+    @staticmethod
+    def update_feed(db: Session, feed_id: int, data: FeedUpdate , current_user):
+        feed = db.query(Feed).filter(Feed.id == feed_id).first()
+        if not feed:
+            raise ValueError("feed no encontrado")
+        
+        if current_user.role not in ["ROOT", "ADMIN"]:
+            raise ValueError("No tienes permisos para actualizar este feed")
+        
+        update_data = data.dict(exclude_unset=True)
+        for key, value in update_data.items():
+            setattr(feed, key, value)
+        
+        db.commit()
+        db.refresh(feed)
+        return feed
+
+    @staticmethod
+    def delete_feed(db: Session, feed_id: int, current_user):
+        feed = db.query(Feed).filter(Feed.id == feed_id).first()
+        if not feed:
+            raise ValueError("feed no encontrado")
+        
+        if current_user.role not in ["ROOT", "ADMIN"]:
+            raise ValueError("No tienes permisos para eliminar este feed")
+        
+        try:
+            feed.is_active = False
+            feed.deleted_at = datetime.utcnow()
+            feed.deleted_by = current_user.id
+            db.commit()
+            db.refresh(feed)
+        except Exception as e:
+            db.rollback()
+            raise ValueError(f"Error al eliminar el feed: {e}")
+        
+        return {"message": "feed eliminado correctamente"}
+
+