This one is an easy one but still tripped me up. I'm working on a project where generators on RSpec stub files are turned off (don't ask; disagreement about the utility of generators between two senior engineers and I lost) and I just got this error:
bundle exec rspec spec/models/metric_type_spec.rb An error occurred while loading ./spec/models/metric_type_spec.rb. Failure/Error: RSpec.describe MetricType, type: :model do describe "#val_col" do it "should return int_val for word_count" do h = FactoryBot.create(:metric_type_word_count) expect(h.val_col).to eq :int_val end it "should return float_val for weight" do h = FactoryBot.create(:metric_type_weight) expect(h.val_col).to eq :float_val NameError: uninitialized constant MetricType # ./spec/models/metric_type_spec.rb:1:in `<top (required)>' No examples found.
And the error turned out to be that this line was missing:
That line is normally inserted by the generator but I built this spec file from scratch and just missed it. I've stared at that line a thousand, thousand times over the years but I suspect I never realized that what it did was tell RSpec something like this:
"Read the Rails directory structure and autoload all classes in the directories below /app". Doh!