migrations of data set table are failing

[ngehlenborg]

I am unable to update the VM with the latest code due to fab vm update failing during the application of migrations:

[vagrant@127.0.0.1:2200] out: 2015-10-25 15:37:01 DEBUG    south:270 execute() - execute "ALTER TABLE "core_workflowengine" ADD CONSTRAINT "core_workflowengine_slug_uniq" UNIQUE ("slug")" with params "[]"
[vagrant@127.0.0.1:2200] out: 2015-10-25 15:37:01 DEBUG    south:270 execute() - execute "ALTER TABLE "core_noderelationship" ADD CONSTRAINT "core_noderelationship_slug_uniq" UNIQUE ("slug")" with params "[]"
[vagrant@127.0.0.1:2200] out: 2015-10-25 15:37:01 DEBUG    south:270 execute() - execute "ALTER TABLE "core_dataset" ADD CONSTRAINT "core_dataset_slug_uniq" UNIQUE ("slug")" with params "[]"
[vagrant@127.0.0.1:2200] out: FATAL ERROR - The following SQL query failed: ALTER TABLE "core_dataset" ADD CONSTRAINT "core_dataset_slug_uniq" UNIQUE ("slug")
[vagrant@127.0.0.1:2200] out: The error was: could not create unique index "core_dataset_slug_uniq"
[vagrant@127.0.0.1:2200] out: DETAIL:  Key (slug)=() is duplicated.
[vagrant@127.0.0.1:2200] out: 
[vagrant@127.0.0.1:2200] out: Error in migration: core:0042_auto__add_unique_diskquota_slug__add_unique_download_slug__add_unique_
[vagrant@127.0.0.1:2200] out: IntegrityError: could not create unique index "core_dataset_slug_uniq"
[vagrant@127.0.0.1:2200] out: DETAIL:  Key (slug)=() is duplicated.
[vagrant@127.0.0.1:2200] out: 

Fatal error: run() received nonzero return code 1 while executing!

Requested: /vagrant/refinery/manage.py syncdb --migrate
Executed: /bin/bash -l -c "workon refinery-platform && /vagrant/refinery/manage.py syncdb --migrate"

Aborting.
Disconnecting from 127.0.0.1:2200... done.

[ngehlenborg]

The problem was that my database contained 3 datasets that had an empty string "" as their slug rather than (none). Those were data sets that were imported with the ISA-Tab UI upload rather than through the command line importer. I will investigate this.