list all cities

Author: Richouf95

0x0F-python-object_relational_mapping/102-relationship_cities_states_list.py

@@ -0,0 +1,28 @@
+#!/usr/bin/python3
+"""
+script that lists all City objects from the database hbtn_0e_101_usa
+"""
+
+import sys
+from relationship_state import Base, State
+from relationship_city import City
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+if __name__ == "__main__":
+    engine = create_engine(
+            "mysql+mysqldb://{}:{}@localhost:3306/{}".format(
+                sys.argv[1],
+                sys.argv[2],
+                sys.argv[3]
+                ), pool_pre_ping=True
+            )
+    Base.metadata.create_all(engine)
+    Session = sessionmaker(bind=engine)
+    session = Session()
+
+    states = session.query(State).order_by(State.id)
+
+    for state in states:
+        for city in state.cities:
+            print("{}: {} -> {}".format(city.id, city.name, state.name))