Should be pretty easy to test :)

> On Jun 3, 2014, at 17:37, Ellen Spertus <notifications@github.com> wrote:
> 
> In lib/tasks/seed.rake:
> 
> > @@ -14,6 +14,20 @@ namespace :seed do
> >      end
> >    end
> >  
> > +  task import_stanford_hints: :environment do
> > +    LevelSourceHint.transaction do
> > +      CSV.read('config/stanford-hint-ids.tsv', { col_sep: "\t" }).each do |row|
> > +        LevelSourceHint.create!(level_source_id: row[0], hint_id: row[1])
> It looks like you're right about mysql accepting null values in unique keys ( http://stackoverflow.com/questions/3712222/does-mysql-ignore-null-values-on-unique-constraints). I feel a little nervous relying on that detail but trust your judgment.
> …
> —
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