Fix deploy tokens without `expire_at` crashes

app/models/deploy_token.rb

@@ -30,7 +30,7 @@ class DeployToken < ActiveRecord::Base
   end
 
   def active?
-    !revoked && expires_at > Date.today
+    !revoked && !expired?
   end
 
   def scopes
@@ -63,6 +63,12 @@ class DeployToken < ActiveRecord::Base
 
   private
 
+  def expired?
+    return false unless expires_at
+
+    expires_at < Date.today
+  end
+
   def ensure_at_least_one_scope
     errors.add(:base, "Scopes can't be blank") unless read_repository || read_registry
   end

spec/models/deploy_token_spec.rb

@@ -74,6 +74,14 @@ describe DeployToken do
         expect(deploy_token.active?).to be_falsy
       end
     end
+
+    context "when it hasn't been revoked and has no expiry" do
+      let(:deploy_token) { create(:deploy_token, expires_at: nil) }
+
+      it 'should return true' do
+        expect(deploy_token.active?).to be_truthy
+      end
+    end
   end
 
   describe '#username' do