It should solve my problem. I'm still amazed by the very high quality of this mailing-list. The answers are always targeting very precisely the solutions to the problems I'm sharing. Thanks a lot !!
Le ven. 11 janv. 2019 à 20:45, Mike Bayer <mike...@zzzcomputing.com> a écrit : > On Fri, Jan 11, 2019 at 1:19 PM tonthon <tontho...@gmail.com> wrote: > > > > Hi, > > > > We're using Sqlalchemy in a Pyramid web application, with the pyramid_tm > package (a transaction that wraps every web request inside a DB > transaction). It's very usefull and it works like a charm. > > > > In order to follow some security rules and to be able to certify part of > our app, we want to change some things : > > - For a specific MyModel, the main bind should have only read access. > > - Another bind, dedicated to MyModel and only used by a separated > library should have RW privileges. > > > > The problem comes with the following : > > - A "transaction" begins > > - A "session1" object is initialized with the Read-only bind > > - An "instance1" of MyModel is loaded in "session1" > > - A "session2" using a binding with RW privileges is initialized > > - It loads a MyModel "instance2" in the "session2" and modifies it (then > merges it) > > - "session2" is commited (instance2 is persisted) > > - I can't get the "instance1" of MyModel initially loaded to be > refreshed (surely due to the transaction isolation level). > > > > Has anyone an advice to share on how to refresh "instance1" ? > > if these "binds" point to exactly the same database schema and just > have different permissions you might find it much easier to use one > session with two binds. You can override get_bind() to use a > different engine for write operations on a specific model. there's > an example of this at: > > https://techspot.zzzeek.org/2012/01/11/django-style-database-routers-in-sqlalchemy/ > . there's also a special hook where you can persist individual > instances of a class on different database connections too but you > shouldn't need that here. > > > > > > > > Thanks in advance > > Best regards > > Gaston Tjebbes > > http://majerti.fr > > > > > > > > > > -- > > SQLAlchemy - > > The Python SQL Toolkit and Object Relational Mapper > > > > http://www.sqlalchemy.org/ > > > > To post example code, please provide an MCVE: Minimal, Complete, and > Verifiable Example. See http://stackoverflow.com/help/mcve for a full > description. > > --- > > You received this message because you are subscribed to the Google > Groups "sqlalchemy" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to sqlalchemy+unsubscr...@googlegroups.com. > > To post to this group, send email to sqlalchemy@googlegroups.com. > > Visit this group at https://groups.google.com/group/sqlalchemy. > > For more options, visit https://groups.google.com/d/optout. > > -- > SQLAlchemy - > The Python SQL Toolkit and Object Relational Mapper > > http://www.sqlalchemy.org/ > > To post example code, please provide an MCVE: Minimal, Complete, and > Verifiable Example. See http://stackoverflow.com/help/mcve for a full > description. > --- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+unsubscr...@googlegroups.com. > To post to this group, send email to sqlalchemy@googlegroups.com. > Visit this group at https://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. > -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
