Fix delete cascade

bin/ffx/ffx_app.py

@@ -1,4 +1,4 @@
-import os
+import os, time, sqlite3, sqlalchemy
 
 from textual.app import App, ComposeResult
 from textual.screen import Screen
@@ -53,6 +53,17 @@ class FfxApp(App):
 
         Base.metadata.create_all(self.context['database_engine'])
 
+        # isSyncronuous = False
+        # while not isSyncronuous:
+        # while True:
+        #     try:
+        #         with self.context['database_engine'].connect() as connection:
+        #             connection.execute(sqlalchemy.text('PRAGMA foreign_keys=ON;'))
+        #             #isSyncronuous = True
+        #             break
+        #     except sqlite3.OperationalError:
+        #         time.sleep(0.1)
+
 
     def on_mount(self) -> None:
         

bin/ffx/model/pattern.py

@@ -1,5 +1,5 @@
 from sqlalchemy import create_engine, Column, Integer, String, ForeignKey
-from sqlalchemy.orm import relationship, sessionmaker, Mapped
+from sqlalchemy.orm import relationship, sessionmaker, Mapped, backref
 
 from .show import Base
 

bin/ffx/model/show.py

@@ -5,11 +5,20 @@ from sqlalchemy.orm import relationship, declarative_base, sessionmaker
 Base = declarative_base()
 
 class Show(Base):
+    """
+    relationship(argument, opt1, opt2, ...)
+    argument is string of class or Mapped class of the target entity
+    backref creates a bi-directional corresponding relationship (back_populates preferred)
+    back_populates points to the corresponding relationship (the actual class attribute identifier)
+    
+    See: https://docs.sqlalchemy.org/en/(14|20)/orm/basic_relationships.html
+    """
 
     __tablename__ = 'shows'
 
     # v1.x
     id = Column(Integer, primary_key=True)
+
     name = Column(String)
     year = Column(Integer)
 
@@ -19,7 +28,9 @@ class Show(Base):
     # year: Mapped[int] = mapped_column(Integer, nullable=False)
 
     # v1.x
+    #patterns = relationship('Pattern', back_populates='show', cascade="all, delete", passive_deletes=True)
     patterns = relationship('Pattern', back_populates='show', cascade="all, delete")
+    # patterns = relationship('Pattern', back_populates='show', cascade="all")
 
     # v2.0
     # patterns: Mapped[List["Pattern"]] = relationship(back_populates="show", cascade="all, delete")

bin/ffx/show_delete_screen.py

@@ -110,8 +110,14 @@ class ShowDeleteScreen(Screen):
             s = self.Session()
             q = s.query(Show).filter(Show.id == int(show_id))
 
+
             if q.count():
-                q.delete()
+
+                #DAFUQ: https://stackoverflow.com/a/19245058
+                # q.delete()
+                show = q.first()
+                s.delete(show)
+
                 s.commit()
                 return True
             return False

bin/ffx/shows_screen.py

@@ -125,7 +125,7 @@ class ShowsScreen(Screen):
             return [(int(s.id), s.name, s.year) for s in q.all()]
 
         except Exception as ex:
-            click.ClickException(f"ShowsScreen(): {repr(ex)}")
+            click.ClickException(f"loadShows(): {repr(ex)}")
         finally:
             s.close()