On Fri, Jul 5, 2019, at 6:16 AM, Simon King wrote: > In Python, modules are executed when they are imported. Class > definitions are executable statements, where the metaclass is called > to construct the *class*. When you import a module containing > declarative classes, the SQLAlchemy metaclass is called for each of > those classes, building the mappings, registering the polymorphic > identities and so on.
> > Simon > > On Fri, Jul 5, 2019 at 10:58 AM natsjoo sodillepa <[email protected]> wrote: > > > > For the curious. One thing that lingers around is the question: how does > > SQLalchemy make the connection between the parent and the child classes? > > > > In the separate modules, where the child classes are defined there is no > > other code. The only thing that gets executed is the class construction, > > but as > > far as I know that doesn't trigger execution of code in the parent class. I > > know that SQLalchemy uses a metaclass but that's used only for > > instantiation of instances, not of classes, or is it? > > > > -- > > 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 [email protected]. > > To post to this group, send email to [email protected]. > > Visit this group at https://groups.google.com/group/sqlalchemy. > > To view this discussion on the web visit > > https://groups.google.com/d/msgid/sqlalchemy/c90cafee-13a4-4759-99a7-b2fd656697b2%40googlegroups.com. > > 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 [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/sqlalchemy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sqlalchemy/CAFHwexebd5F9HXSX_kcBCY3Xey9aiPLThLX3h6GD1v7bomXd%3Dg%40mail.gmail.com. > 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sqlalchemy. To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/4aec65f5-4d5c-449c-ac7b-d88a2c55efe5%40www.fastmail.com. For more options, visit https://groups.google.com/d/optout.
