[jifty-devel] Handling register_triggers with mixins on virtual models

Andrew Sterling Hanenkamp sterling at hanenkamp.com
Wed Aug 22 12:50:49 EDT 2007

I ran into an interesting issue today. I'm having some trouble testing a
database-backed class that uses a mixin, but needs to register triggers for
a column that is created after register_triggers() has already been called.
Which is pretty much always the case unless you reload Jifty completely
after creating all the columns.

I can think of a couple good solutions and I'm thinking of implementing

   1. Virtual models branch change: Add a new
register_triggers_late()method that is only called on database-backed
models when a column is
   created after register_triggers() has been called. It would pass the
   new column info to the method so it could do any column-specific trigger
   updates. This would allow a mixin that may need to implement additional
   triggers on new database-backed columns to do so without mucking with the
   existing API.
   2. Trunk change: Add two new "pseudo-triggers" before_any_set and
   after_any_set. Setting a before_any_set trigger would cause a
   before_set_X trigger to be set for every column on the table. The
   after_any_set trigger would do the same for after_set_X. The virtual
   models branch would then add these triggers to any new column as they are
   created as well.

Any objections/suggestions?

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