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venv/lib/python3.9/site-packages/sqlalchemy_utils/relationships/chained_join.py

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+def chained_join(*relationships):
+    """
+    Return a chained Join object for given relationships.
+    """
+    property_ = relationships[0].property
+
+    if property_.secondary is not None:
+        from_ = property_.secondary.join(
+            property_.mapper.class_.__table__, property_.secondaryjoin
+        )
+    else:
+        from_ = property_.mapper.class_.__table__
+    for relationship in relationships[1:]:
+        prop = relationship.property
+        if prop.secondary is not None:
+            from_ = from_.join(prop.secondary, prop.primaryjoin)
+
+            from_ = from_.join(prop.mapper.class_, prop.secondaryjoin)
+        else:
+            from_ = from_.join(prop.mapper.class_, prop.primaryjoin)
+    return from_