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 23902,Migrating between Geography / Geometry types fails,mitchell,nobody,"Adding or removing the ""{{{geography=True}}}"" argument to or from a GIS column generates a migration which then fails to run because the columns are two distinct types and cannot be converted between easily. Exception: {{{ Traceback (most recent call last): File ""bin/django"", line 9, in load_entry_point('myproject==1.0.0', 'console_scripts', 'django')() File ""/home/mitchell/myproject/myproject/manage.py"", line 19, in main execute_from_command_line(argv) File ""/home/mitchell/myproject/local/lib/python2.7/site-packages/django/core/management/__init__.py"", line 385, in execute_from_command_line utility.execute() File ""/home/mitchell/myproject/local/lib/python2.7/site-packages/django/core/management/__init__.py"", line 377, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File ""/home/mitchell/myproject/local/lib/python2.7/site-packages/django/core/management/base.py"", line 288, in run_from_argv self.execute(*args, **options.__dict__) File ""/home/mitchell/myproject/local/lib/python2.7/site-packages/django/core/management/base.py"", line 338, in execute output = self.handle(*args, **options) File ""/home/mitchell/myproject/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py"", line 160, in handle executor.migrate(targets, plan, fake=options.get(""fake"", False)) File ""/home/mitchell/myproject/local/lib/python2.7/site-packages/django/db/migrations/executor.py"", line 63, in migrate self.apply_migration(migration, fake=fake) File ""/home/mitchell/myproject/local/lib/python2.7/site-packages/django/db/migrations/executor.py"", line 97, in apply_migration migration.apply(project_state, schema_editor) File ""/home/mitchell/myproject/local/lib/python2.7/site-packages/django/db/migrations/migration.py"", line 107, in apply operation.database_forwards(self.app_label, schema_editor, project_state, new_state) File ""/home/mitchell/myproject/local/lib/python2.7/site-packages/django/db/migrations/operations/fields.py"", line 139, in database_forwards schema_editor.alter_field(from_model, from_field, to_field) File ""/home/mitchell/myproject/local/lib/python2.7/site-packages/django/db/backends/schema.py"", line 459, in alter_field raise ValueError(""Cannot alter field %s into %s - they do not properly define db_type (are you using PostGIS 1.5 or badly-written custom fields?)"" % ( ValueError: Cannot alter field main.Venue.coordinates into main.Venue.coordinates - they do not properly define db_type (are you using PostGIS 1.5 or badly-written custom fields?) }}} Django 1.7.1.",Bug,new,GIS,1.7,Normal,,,,Accepted,0,0,0,0,0,0