您可以使用
NOT EXISTS
在联接表上构造。
@property
def potential_attendees(self):
sq = db.session.query(contact_party_ass_tab.columns.contact_id).subquery()
return db.session.query(Contact).filter(
Contact.party_organiser_id==self.party_organiser_id,
~exists().where(sq.c.contact_id==Contact.id)
).all()
from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy
from sqlalchemy import exists
from sqlalchemy.orm import validates
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///:memory:'
db = SQLAlchemy(app)
class PartyOrganiser(db.Model):
__tablename__ = 'party_organiser'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String)
parties = db.relationship("Party", back_populates='party_organiser')
contacts = db.relationship("Contact", back_populates='party_organiser')
def __repr__(self):
return self.name
contact_party_ass_tab = db.Table('contact_party', db.Model.metadata,
db.Column('party_id', db.Integer, db.ForeignKey('party.id')),
db.Column('contact_id', db.Integer, db.ForeignKey('contact.id')))
class Party(db.Model):
__tablename__ = 'party'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String)
details = db.Column(db.String)
party_organiser_id = db.Column(db.Integer, db.ForeignKey('party_organiser.id'), nullable=False)
party_organiser = db.relationship("PartyOrganiser", back_populates="parties", uselist=False)
attendees = db.relationship("Contact", secondary=contact_party_ass_tab, back_populates='intended_parties')
def __repr__(self):
return self.name
@property
def potential_attendees(self):
sq = db.session.query(contact_party_ass_tab.columns.contact_id).subquery()
return db.session.query(Contact).filter(
Contact.party_organiser_id==self.party_organiser_id,
~exists().where(sq.c.contact_id==Contact.id)
).all()
@validates('attendees')
def validate_attendee(self, key, attendee):
assert attendee.party_organiser_id == self.party_organiser_id
return attendee
class Contact(db.Model):
__tablename__ = 'contact'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String)
party_organiser_id = db.Column(db.Integer, db.ForeignKey('party_organiser.id'), nullable=False)
party_organiser = db.relationship("PartyOrganiser", back_populates="contacts", uselist=False)
intended_parties = db.relationship("Party", secondary=contact_party_ass_tab, back_populates='attendees')
def __repr__(self):
return self.name
@validates('intended_parties')
def validate_party(self, key, party):
assert party.party_organiser_id == self.party_organiser_id
return party
db.create_all()
organiser1 = PartyOrganiser(name="organiser1")
organiser2 = PartyOrganiser(name="organiser2")
db.session.add_all([organiser1, organiser2])
db.session.commit()
org1_party1 = Party(name="Organiser1's Party1", party_organiser_id=organiser1.id)
org1_party2 = Party(name="Organiser1's Party2", party_organiser_id=organiser1.id)
org2_party1 = Party(name="Organiser2's Party1", party_organiser_id=organiser2.id)
org2_party2 = Party(name="Organiser2's Party2", party_organiser_id=organiser2.id)
db.session.add_all([org1_party1, org1_party2, org2_party1, org2_party2])
db.session.commit()
org1_contact1 = Contact(name="Organiser1's contact 1", party_organiser_id=organiser1.id)
org1_contact2 = Contact(name="Organiser1's contact 2", party_organiser_id=organiser1.id)
org1_contact3 = Contact(name="Organiser1's contact 3", party_organiser_id=organiser1.id)
org1_contact4 = Contact(name="Organiser1's contact 4", party_organiser_id=organiser1.id)
org2_contact1 = Contact(name="Organiser2's contact 1", party_organiser_id=organiser2.id)
org2_contact2 = Contact(name="Organiser2's contact 2", party_organiser_id=organiser2.id)
org2_contact3 = Contact(name="Organiser2's contact 3", party_organiser_id=organiser2.id)
org2_contact4 = Contact(name="Organiser2's contact 4", party_organiser_id=organiser2.id)
db.session.add_all([org1_contact1, org1_contact2, org1_contact3, org1_contact4, org2_contact1, org2_contact2, org2_contact3, org2_contact4])
db.session.commit()
org1_party1.attendees.append(org1_contact1)
db.session.commit()
print "Potential attendees of org1_party1 ", org1_party1.potential_attendees
print "Attempting to add a contact of a different organiser. Will throw exception"
org1_party1.attendees.append(org2_contact1)
In [1]: from exclusion_query import *
/home/surya/Envs/inkmonk/local/lib/python2.7/site-packages/flask_sqlalchemy/__init__.py:794: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future. Set it to True or False to suppress this warning.
'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
Potential attendees of org1_party1 [Organiser1's contact 2, Organiser1's contact 3, Organiser1's contact 4]
Attempting to add a contact of a different organiser. Will throw exception
---------------------------------------------------------------------------
AssertionError Traceback (most recent call last)
<ipython-input-1-4380704ace46> in <module>()
----> 1 from exclusion_query import *
