From da2bdb1f833df4dee34a8ab7870a0f0b0e65f17c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7oise=20Conil?= <francoise.conil@liris.cnrs.fr>
Date: Fri, 7 Jan 2022 16:22:21 +0100
Subject: [PATCH] Test d'une association de 3 tables : pas abouti
---
relationship/association_object_ternary.py | 101 +++++++++++++++++++++
1 file changed, 101 insertions(+)
create mode 100644 relationship/association_object_ternary.py
diff --git a/relationship/association_object_ternary.py b/relationship/association_object_ternary.py
new file mode 100644
index 0000000..30a1389
--- /dev/null
+++ b/relationship/association_object_ternary.py
@@ -0,0 +1,101 @@
+"""
+https://docs.sqlalchemy.org/en/14/orm/basic_relationships.html#association-object
+"""
+from datetime import datetime
+
+from sqlalchemy import create_engine
+from sqlalchemy import Column, ForeignKey, Integer, Text, DateTime
+from sqlalchemy.orm import declarative_base, relationship
+from sqlalchemy.orm.session import Session
+
+
+Base = declarative_base()
+
+
+class UserOrgRole(Base):
+ __tablename__ = "user_org_role"
+
+ user_id = Column(
+ ForeignKey("user.id", ondelete="CASCADE"), primary_key=True
+ )
+ org_id = Column(ForeignKey("org.id", ondelete="CASCADE"), primary_key=True)
+ # Does it make sense ?
+ role_id = Column(
+ ForeignKey("role.id", ondelete="CASCADE"), primary_key=True
+ )
+
+ # I do not know what the relationship could back populate, org or role ???
+ user = relationship("User")
+ org = relationship("Org")
+ role = relationship("Role")
+
+
+class User(Base):
+ __tablename__ = "user"
+
+ id = Column(Integer, primary_key=True)
+ username = Column(Text, index=True, nullable=False)
+ fullname = Column(Text, nullable=False)
+ account_type = Column(Text, nullable=False)
+
+ def __repr__(self):
+ return (
+ f"<User (username={self.username}, fullname={self.fullname}, "
+ f"account_type={self.account_type})>"
+ )
+
+
+class Org(Base):
+ __tablename__ = "org"
+
+ id = Column(Integer, primary_key=True)
+ name = Column(Text, index=True, nullable=False)
+ slug = Column(Text, index=True, nullable=False)
+ created_at = Column(DateTime)
+
+ def __repr__(self):
+ return (
+ f"<Org (name={self.name}, slug={self.slug}, "
+ f"created_at={self.created_at})>"
+ )
+
+
+class Role(Base):
+ __tablename__ = "role"
+
+ id = Column(Integer, primary_key=True)
+ name = Column(Text, index=True, nullable=False)
+
+ def __repr__(self):
+ return f"<Role (name={self.name})>"
+
+
+if __name__ == "__main__":
+ engine = create_engine(
+ "sqlite:///association_object_ternary.db", echo=False
+ )
+
+ Base.metadata.drop_all(engine)
+ Base.metadata.create_all(engine)
+
+ with Session(engine) as session:
+ # create parent, append a child via association
+ u1 = User(
+ username="jlondon",
+ fullname="Jack London",
+ account_type="member",
+ )
+ o1 = Org(name="o1", slug="o1", created_at=datetime.utcnow())
+ owner = Role(name="owner")
+
+ uor1 = UserOrgRole()
+ uor1.user = u1
+ uor1.org = o1
+ uor1.role = owner
+
+ with session.begin():
+ session.add(u1)
+ session.add(o1)
+ session.add(owner)
+
+ session.add(uor1)
--
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