Am Montag, 7. August 2017 09:43:00 UTC+2 schrieb Andréas Kühne:
>
> Hi,
>
> I understand your concern, however I would like to learn more about how
> you intend to solve the problem. The only way I could see a solution would
> be to change the database user depending on which application user is
> logged in. That would mean updating users and permissions in the database
> every time it changes on the application level. I think this would add a
> lot of complexity that you really don't want.
>
>
Using the postgres users would be possible, but like you I think this makes
things more complicated than necessary.
> You could of course have one role for each group you intend to have in the
> application and then apply the permissions accordingly. That would however
> mean that your user permissions solution is very rigid. One of the things
> that I like about django is the ability to add and delete permissions
> easily and swiftly. I'm wondering if you instead couldn't create mixins to
> make sure that the permissions are correct for each object. That way the
> code will be easily testable and also less error prone. However it won't
> create great SQL queries though.
>
> Also - I find that working in Python is a lot easier than working in raw
> SQL :-) but you will of course need to adapt the queries to make them
> faster (which can be done by prefetching for example).
>
>
Yes, writing python is more easy, but if you need the conditions in SQL
WHERE to get a queryset, you don't have python. You have a nice ORM
MyModel.objects.filter(...) which
is nice and helps to create the needed SQL statements.
> That's just my 2 cents.
>
> Regards,
>
> Andréas
>
> 2017-08-07 8:43 GMT+02:00 guettli <guettli...@thomas-guettler.de
> <javascript:>>:
>
>> Hello this post is now four days old. I would like to hear from other
>> people.
>>
>> Something like:
>>
>> "I have no clue what you are talking about" or
>> "I understand your concerns, but I have no clue, too" or
>> "Thank you about talking about this, this raised my awareness"
>>
>> would make me happy.
>>
>> Thank you.
>>
>> Am Donnerstag, 3. August 2017 10:07:53 UTC+2 schrieb guettli:
>>>
>>> First I asked a similar question on the postgresql-general list. The
>>> discussion[1] has settled there.
>>>
>>> Now I would love the hear what you think.
>>>
>>>
>>> I am thinking about rewriting an existing application which uses PostgreSQL
>>> via Django.
>>>
>>> Up to now the permission checks are done at the application level.
>>>
>>> Up to now queries like: "Show all items which the current user is allowed
>>> to modify" result in complicated SQL and
>>> this leads to slow queries.
>>>
>>> Up to now there is one db-user and the application does the filtering of
>>> rows to prevent application users to see
>>> items which they are not allowed to see.
>>>
>>> I guess most web applications work like this.
>>>
>>> I would like to reduce the "ifing and elsing" in my python code (less
>>> conditions, less bugs, more SQL, more performance)
>>> One important intention for me: I would like to avoid the redundancy. As
>>> soon as I want to query for
>>> "Show all items which the current user is allowed to modify" I need the
>>> permission checking in a SQL WHERE condition.
>>>
>>> If I implement this. Then my code which might look like this is redundant:
>>>
>>> {{{
>>>
>>> def has_perm(obj, user):
>>> if user.is_superuser:
>>> return True
>>> ...
>>>
>>> }}}
>>>
>>>
>>> Yes, I feel farewell pain. I love Python, but I guess I will use perm
>>> checking via SQL WHERE for new projects in the future.
>>>
>>> What do you think?
>>>
>>> Regards,
>>> Thomas Güttler
>>>
>>> [1]:
>>> https://www.postgresql.org/message-id/e662fd8a-6001-514c-71e8-01718444f338%40thomas-guettler.de
>>>
>>> --
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