id,summary,reporter,owner,description,type,status,component,version,severity,resolution,keywords,cc,stage,has_patch,needs_docs,needs_tests,needs_better_patch,easy,ui_ux 23761,Mysql validator crashes with None db_type return. - Backport of master fix to 1.7,Adam DePue,Tim Graham,"When implementing a custom field type with a db_type() method that returns None, on Django 1.6 and below we would signify not to create a column at all. With Django 1.7, this causes a crash with the mysql backend. The issue is already fixed in master and this simply backports the safety check. A fix was made in August in master: https://github.com/django/django/commit/e9103402c0fa873aea58a6a11dba510cd308cb84#diff-14 The fix contains a lot more than is needed for this specific issue, however the specific changes to django/db/backends/mysql/validation.py would be great to have in Django 1.7. This worked fine in < Django 1.7 and works fine in upstream.",Bug,closed,Core (System checks),1.7,Release blocker,fixed,mysql db_type,,Accepted,1,0,0,0,0,0