I second djidjadji's suggestion. While it's true that your application will
be unavailable, it's definitely the simplest solution and gives your
users aclear expectation that some of your application's functionality
is not
available; otherwise, they might be confused why some aspects of your site
work but others don't, especially if your messaging is subtle.
The only other suggestion is to wrap all of your write calls to the
datastore so you can easily disable them altogether. That's tricker than the
first solution, however.
- Jason
2009/4/28 Alkis Evlogimenos ('Αλκης Ευλογημένος) <[email protected]>
> Yes but this means no access to the site for the duration. I want to have
> read only access to the site for the duration.
>
> 2009/4/28 djidjadji <[email protected]>
>
>
>> If you don't have to do it often you can use the following method.
>>
>> Make a version of the application that displays a page that the site
>> is temporarily under maintenance. Give an estimate for how long it
>> will take.
>> app.yaml redirects all requests to maintenance.py
>>
>> Find a time of day where the site is less busy.
>> Make the maintenance version current.
>> Update version X to the new schema.
>> Do the update using urls http://X.latest.myapp.appspot.com
>> Test the update
>> Make X the new version.
>>
>> This is the least hassle, I think.
>>
>> 2009/4/28 Alkis Evlogimenos ('Αλκης Ευλογημένος) <[email protected]>:
>> > Sometimes you want to make the datastore readonly for users to perform
>> some
>> > global changes (say schema update).
>> > How do people achieve this?
>> > Out of what I can think of:
>> > - Do you write another version of your application that errors on each
>> > request that writes to the datastore? This seems error prone and a
>> > maintenance headache.
>> > - Do you monkeypatch db.put and db.delete to unconditionally throw an
>> > exception and make that exception visible to the frontend?
>> > - Do you use hooks and pre hook datastore operations to throw an
>> exception
>> > and make that exception visible to the frontend?
>> > Any other ideas?
>> > --
>> >
>> > Alkis
>>
>>
>>
>
>
> --
>
> Alkis
>
> >
>
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