Models, Sessions & Queries. Declarative Models. from sqlalchemy import Column, Integer, String, ForeignKey, create_engine from sqlalchemy.orm import declarative_base, relationship, sessionmaker Base = declarative_base() …
ReadRelationships, Loading Strategies & Migrations. Avoiding N+1 Queries. from sqlalchemy.orm import joinedload, selectinload # N+1 problem: 1 query for authors, then N more — one per author — # when .posts is lazily accesse…
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