use explicit set of dir_obj for path, as ORM cant easily work out which dir is the right one for a path

pa_job_manager.py

@@ -108,10 +108,9 @@ class Path(Base):
     type = relationship("PathType")
     path_prefix = Column(String, unique=True, nullable=False )
     num_files = Column(Integer)
-    dir_obj = relationship("Dir", secondary="path_dir_link", uselist=False)
 
     def __repr__(self):
-        return f"<id: {self.id}, type={self.type}, path_prefix={self.path_prefix}, dir_obj={self.dir_obj}>"
+        return f"<id: {self.id}, type={self.type}, path_prefix={self.path_prefix}>"
 
 class Dir(Base):
     __tablename__ = "dir"
@@ -718,7 +717,7 @@ def JobImportDir(job):
     path_obj.num_files=overall_file_cnt
 
     # this is needed so that later on, when we AddDir for any dirs we find via os.walk, they have a parent dir object that is the dir for the path we are in
-    parent_dir=path_obj.dir_obj
+    parent_dir=session.query(Dir).join(PathDirLink).join(Path).filter(Path.id==path_obj.id,Dir.rel_path=='').first()
 
     # first time through we need dir to be the top level, we have a special if below to no recreate the top dir that AddPath created already
     dir=parent_dir