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    <p>a working sample script means, we can run it fully. Here's a script generated from the snippets you've given. The one thing that helps is to evaluate "assignees" as a list, since you are removing from it, it's likely you're not iterating correctly.</p> <pre><code>from sqlalchemy import * from sqlalchemy.orm import * from sqlalchemy.ext.declarative import declarative_base Base= declarative_base() patent_company_table = Table('pct', Base.metadata, Column('patent_id', Integer, ForeignKey('patent.id')), Column('company_id', Integer, ForeignKey('company.id')) ) class Patent(Base): __tablename__ = "patent" id = Column(Integer, primary_key=True) assignees = relationship('Company', secondary=patent_company_table, backref='patents') class Company(Base): __tablename__ = "company" id = Column(Integer, primary_key=True) e = create_engine("sqlite://") Base.metadata.create_all(e) s = Session(e) p = Patent() c1, c2, c3, c4, c5 = Company(), Company(), Company(), Company(), Company() d1, d2 = Company(), Company() duplicate_company_to_default = {c1:d1, c2:d2, c3:d1, c4:d2} new_assignees = [c1, c2, c3, c4, c5] p.assignees = new_assignees s.add(p) s.commit() patent = s.query(Patent).first() assignees = patent.assignees added_patent_count = 0 for assignee in list(assignees): if assignee in duplicate_company_to_default: patent.assignees.remove(assignee) default_company = duplicate_company_to_default[assignee] if default_company not in assignees: added_patent_count += 1 patent.assignees.append(default_company) assert p in s.dirty s.commit() assert set(p.assignees) == set([d1, d2, c5]) </code></pre>
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    1. PODeleting an Object from Collection in SQLAlchemy
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    1. USzzzeek
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    1. COThanks for writing this up zzzeek. It illustrates the relationship well. I appreciate your help.
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