Changed the names of the files to conform the python convection and also added photo_in_entry.py to diminish the cyclic import error in pylint

src/pilgrim/__init__.py

@@ -0,0 +1,8 @@
+from pilgrim.application import Application
+from pilgrim.command import main
+from pilgrim.database import Database, Base
+from pilgrim.models.travel_diary import TravelDiary
+from pilgrim.models.entry import Entry
+from pilgrim.models.photo import Photo
+
+__all__ = ["Application", "Database", "TravelDiary", "Entry", "Photo", "main", "Base"]

src/pilgrim/application.py

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+from pilgrim.database import Database
+
+
+class Application:
+    def __init__(self):
+        self.database = Database()
+
+    def run(self):
+        self.database.create()

src/pilgrim/command.py

@@ -0,0 +1,6 @@
+from pilgrim.application import Application
+
+
+def main():
+    app = Application()
+    app.run()

src/pilgrim/database.py

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+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+Base = declarative_base()
+
+
+class Database:
+    def __init__(self):
+        self.engine = create_engine(
+            "sqlite:///database.db",
+            echo=False,
+            connect_args={"check_same_thread": False},
+        )
+        self.session = sessionmaker(bind=self.engine, autoflush=False, autocommit=False)
+
+    def create(self):
+        Base.metadata.create_all(self.engine)
+
+    def get_db(self):
+        return self.session()

src/pilgrim/models/entry.py

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+from sqlalchemy import Column, Integer, String, ForeignKey
+from sqlalchemy.orm import relationship
+
+from pilgrim.models.photo_in_entry import photo_entry_association
+from ..database import Base
+
+
+class Entry(Base):
+    __tablename__ = "Entry"
+    id = Column(Integer, primary_key=True)
+    title = Column(String)
+    text = Column(String)
+    date = Column(String)
+    photos = relationship(
+        "Photo",
+        secondary=photo_entry_association,
+        back_populates="entries")
+    fk_TravelDiary_id = Column(Integer, ForeignKey("TravelDiary.id"))

src/pilgrim/models/photo.py

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+from sqlalchemy import Column, Integer, String
+from sqlalchemy.orm import relationship
+
+from pilgrim.models.photo_in_entry import photo_entry_association
+from ..database import Base
+
+
+class Photo(Base):
+    __tablename__ = "photo"
+    id = Column(Integer, primary_key=True)
+    filepath = Column(String)
+    name = Column(String)
+    addition_date = Column(String)
+    caption = Column(String)
+    entries = relationship(
+        "Entry",
+        secondary=photo_entry_association,
+        back_populates="photos"
+    )

src/pilgrim/models/photo_in_entry.py

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+from sqlalchemy import Table, Column, Integer, ForeignKey
+
+from ..database import Base
+
+photo_entry_association = Table('photo_entry_association', Base.metadata,
+Column('id', Integer, primary_key=True, autoincrement=True),
+    Column('fk_Photo_id', Integer, ForeignKey('photo.id')),
+    Column('fk_Entry_id', Integer, ForeignKey('Entry.id')))

src/pilgrim/models/travel_diary.py

@@ -0,0 +1,8 @@
+from sqlalchemy import Column, String, Integer
+
+from ..database import Base
+
+class TravelDiary(Base):
+    __tablename__ = "TravelDiary"
+    id = Column(Integer, primary_key=True)
+    name = Column(String)