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Fix ON DELETE CASCADE issue on relationships

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This commit is contained in:
Lucas Verney 2015-12-25 22:07:06 +01:00
parent e7332e3b91
commit f67495bd38
1 changed files with 19 additions and 10 deletions
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23
database.py
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@ -1,6 +1,8 @@
""" """
This file contains the database schema in SQLAlchemy format. This file contains the database schema in SQLAlchemy format.
""" """
import sqlite3
from sqlalchemy import event from sqlalchemy import event
from sqlalchemy import Column, ForeignKey, Integer, String from sqlalchemy import Column, ForeignKey, Integer, String
from sqlalchemy.engine import Engine from sqlalchemy.engine import Engine
@ -15,12 +17,13 @@ def set_sqlite_pragma(dbapi_connection, connection_record):
""" """
Auto enable foreign keys for SQLite. Auto enable foreign keys for SQLite.
""" """
# Play well with other DB backends
if type(dbapi_connection) is sqlite3.Connection:
cursor = dbapi_connection.cursor() cursor = dbapi_connection.cursor()
cursor.execute("PRAGMA foreign_keys=ON") cursor.execute("PRAGMA foreign_keys=ON")
cursor.close() cursor.close()
# TODO: Backref
class Association(Base): class Association(Base):
# Relationships are to be read "left RELATION right" # Relationships are to be read "left RELATION right"
__tablename__ = "association" __tablename__ = "association"
@ -32,12 +35,15 @@ class Association(Base):
ondelete="CASCADE")) ondelete="CASCADE"))
right_paper = sqlalchemy_relationship("Paper", right_paper = sqlalchemy_relationship("Paper",
foreign_keys=right_id, foreign_keys=right_id,
back_populates="related_by") back_populates="related_by",
relationship = sqlalchemy_relationship("Relationship") passive_deletes=True)
relationship = sqlalchemy_relationship("Relationship",
passive_deletes=True)
left_paper = sqlalchemy_relationship("Paper", left_paper = sqlalchemy_relationship("Paper",
foreign_keys=left_id, foreign_keys=left_id,
back_populates="related_to") back_populates="related_to",
passive_deletes=True)
class Paper(Base): class Paper(Base):
@ -48,11 +54,13 @@ class Paper(Base):
# related_to are papers related to this paper (this_paper R …) # related_to are papers related to this paper (this_paper R …)
related_to = sqlalchemy_relationship("Association", related_to = sqlalchemy_relationship("Association",
foreign_keys="Association.left_id", foreign_keys="Association.left_id",
back_populates="left_paper") back_populates="left_paper",
passive_deletes=True)
# related_by are papers referenced by this paper (… R this_paper) # related_by are papers referenced by this paper (… R this_paper)
related_by = sqlalchemy_relationship("Association", related_by = sqlalchemy_relationship("Association",
foreign_keys="Association.right_id", foreign_keys="Association.right_id",
back_populates="right_paper") back_populates="right_paper",
passive_deletes=True)
def __repr__(self): def __repr__(self):
return "<Paper(id='%d', doi='%s', arxiv_id='%s')>" % ( return "<Paper(id='%d', doi='%s', arxiv_id='%s')>" % (
@ -95,4 +103,5 @@ class Relationship(Base):
id = Column(Integer, primary_key=True) id = Column(Integer, primary_key=True)
name = Column(String(), unique=True) name = Column(String(), unique=True)
associations = sqlalchemy_relationship("Association", associations = sqlalchemy_relationship("Association",
back_populates="relationship") back_populates="relationship",
passive_deletes=True)