django: post_syncdb signal

4 January 2010

My word the docs are verbose.


 


 


from django.db.models import signals


 


from mysite.fixtures import load_fixtures


import sitetools.models as site_models


 


def loader(**args):


 


    load_fixtures()


 


signals.post_syncdb.connect(loader,sender=site_models)





Every time an app in your INSTALLED_APPS is installed a post_syncdb signal will be sent. Specifying sender means that you are connecting to only the signal that gets fired when your app is installed.





If you depend on the Site object to be created then you need to have your app after


'django.contrib.sites' in INSTALLED_APPS.


But note that at that point if you are using postgres gis that there are still no geometry_columns installed.  


here's what django does in syncdb: 



  1. create tables 

  2. emit post_syncdb signal to all apps 

  3. install custom sql for each app

  4. install sql indices for newly created models --  at which time the geometry columns are created 

  5. load initial data (fixtures)


IMO post_syncdb should be emitted ... post syncdb.  it would break too many apps to change it, so the best solution is probably to add another signal syncdb_complete


Its of particular problem to postgres gis apps.



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