The method all() in overrided models.Manager doesn't works as expected

I'm writing a simple CMS, it stores page file data on local file system instead of SQL server.

I do overrides the model Page's Manager, but it not works as expected, problems

• PageManager.all(it calls PageQuerySet?) doesn't works
• I can create Page object in Admin, but can't view it or delete it

Source code is here https://github.com/shuge/mcms/blob/master/pages/models.py

I have read Django Manager docs a couple of times, but it doesn't help.

Thanks for reply.

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