Added the Services layer to the code to do the database operation

src/pilgrim/service/entry_service.py

@@ -0,0 +1,52 @@
+
+
+from ..models.entry import Entry
+from ..models.travel_diary import TravelDiary
+
+
+class EntryService:
+    def __init__(self,session):
+        self.session = session
+
+    def create(self, travel_diary_id:int, title: str, text: str, date: str, ):
+        travel_diary = self.session.query(TravelDiary).filter(TravelDiary.id == travel_diary_id).first()
+        if not travel_diary:
+            return None
+        new_entry = Entry(title,text,date,travel_diary_id)
+        self.session.add(new_entry)
+        self.session.commit()
+        self.session.refresh(new_entry)
+
+
+        return new_entry
+
+    def read_by_id(self,entry_id:int):
+        entry = self.session.query(Entry).filter(Entry.id == entry_id).first()
+        return entry
+
+    def read_all(self):
+        entries = self.session.query(Entry).all()
+        return entries
+
+    def update(self,entry_src:Entry,entry_dst:Entry):
+        original:Entry = self.read_by_id(entry_src.id)
+        if original:
+            original.title = entry_dst.title
+            original.text = entry_dst.text
+            original.date = entry_dst.date
+            original.fk_TravelDiary_id = entry_dst.fk_TravelDiary_id
+            original.photos = entry_dst.photos
+            self.session.commit()
+            self.session.refresh(original)
+        return original
+
+    def delete(self,entry_src:Entry):
+        excluded = self.read_by_id(entry_src.id)
+        if excluded is not None:
+            self.session.delete(excluded)
+            self.session.commit()
+            return excluded
+        return None
+
+
+