Relation does not exist when running rspec tests
Had this same problem and used the solution in the comment from cuvius. Posting here so that people don't miss it!
Run: RAKE_ENV=test rake db:migrate:reset db:test:prepare to set up your test database.
Unfortunately rake db:test:prepare is deprecated in rails 4+ so it's not best solution now.
I guess that in your user factory class written as User. The problem occurs because factories loads before migrations done.
So to solve this:
Change in your factory class name from
factory :user, class: User do # ...endto
factory :user, class: 'User' do # ...end