Added the photo_service.py and modified photo.py to have all the crud operations

src/pilgrim/models/photo.py

@@ -1,3 +1,5 @@
+from typing import Any
+
 from sqlalchemy import Column, Integer, String
 from sqlalchemy.orm import relationship
 
@@ -12,8 +14,16 @@ class Photo(Base):
     name = Column(String)
     addition_date = Column(String)
     caption = Column(String)
-    entries = relationship(
+    entries:relationship = relationship(
         "Entry",
         secondary=photo_entry_association,
         back_populates="photos"
     )
+    def __init__(self, filepath, name, addition_date=None, caption=None, entries=None, **kw: Any):
+        super().__init__(**kw)
+        self.filepath = filepath
+        self.name = name
+        self.addition_date = addition_date
+        self.caption = caption
+        self.entries = entries
+

src/pilgrim/service/photo_service.py

@@ -0,0 +1,46 @@
+from pathlib import Path
+from typing import List
+
+from pilgrim import Photo
+
+
+class PhotoService:
+    def __init__(self, session):
+        self.session = session
+
+    def create(self, filepath:Path, name:str, addition_date=None, caption=None,) -> Photo:
+
+        new_photo = Photo(filepath, name, addition_date=addition_date, caption=caption)
+        self.session.add(new_photo)
+        self.session.commit()
+        self.session.refresh(new_photo)
+
+        return new_photo
+    def read_by_id(self, photo_id:int) -> Photo:
+        return self.session.query(Photo).get(photo_id)
+
+    def read_all(self) -> List[Photo]:
+        return self.session.query(Photo).all()
+
+    def update(self,photo_src:Photo,photo_dst:Photo) -> Photo | None:
+        original:Photo = self.read_by_id(photo_src.id)
+        if original:
+            original.filepath = photo_dst.filepath
+            original.name = photo_dst.name
+            original.addition_date = photo_dst.addition_date
+            original.caption = photo_dst.caption
+            original.entries.extend(photo_dst.entries)
+            self.session.commit()
+            self.session.refresh(original)
+            return original
+        return None
+
+    def delete(self, photo_src:Photo) -> Photo | None:
+        excluded = self.read_by_id(photo_src.id)
+        if excluded:
+            self.session.delete(excluded)
+            self.session.commit()
+            self.session.refresh(excluded)
+            return excluded
+        return None
+