On 05/17/2017 05:25 PM, Jaco Breitenbach wrote:
Thank you, Jonathan, that wiki example has helped a lot. I've extended
it a bit to also add the extra condition to joined tables.
I want to take it one step further now and automatically convert
session.delete()s into update statements (set is_deleted = true) instead
of delete statements. I've experimented with a custom SessionExtension,
don't use "Extensions", use the event system:
http://docs.sqlalchemy.org/en/rel_1_1/orm/events.html?highlight=before_flush#sqlalchemy.orm.events.SessionEvents.before_flush
session.deleted.pop() # Remove the instance from the
list of entities to be deleted
ouch...that's not going to do anything. everything in Python is
mutable and it's kind of hard to make every collection everywhere that
only is a view of things immutable (though this is custom collection,
could be made immutable with a flag or something). To undo the delete,
add the object back, session.add(object).
Thank you and kind regards,
Jaco
On Tuesday, 16 May 2017 17:20:12 UTC+1, Jonathan Vanasco wrote:
The FAQ
http://docs.sqlalchemy.org/en/latest/faq/sessions.html#how-do-i-make-a-query-that-always-adds-a-certain-filter-to-every-query
<http://docs.sqlalchemy.org/en/latest/faq/sessions.html#how-do-i-make-a-query-that-always-adds-a-certain-filter-to-every-query>
points to an example in the wiki:
https://bitbucket.org/zzzeek/sqlalchemy/wiki/UsageRecipes/PreFilteredQuery
<https://bitbucket.org/zzzeek/sqlalchemy/wiki/UsageRecipes/PreFilteredQuery>
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