Less code

app/mutations/sequences/update.rb

@@ -14,27 +14,12 @@ module Sequences
     end
 
     def validate
-      read_users_mind
+      add_error(:steps, :empty, "Can't be blank") if steps == []
       raise Errors::Forbidden unless sequence.device.users.include?(user)
     end
 
     def execute
       update_attributes(sequence, inputs.except(:user, :sequence, :_id))
     end
-
-    def read_users_mind
-      case steps
-      when nil
-        # User doesn't want to touch the steps.
-        nil
-      when []
-        # User wants to empty the step list
-        # This is not legal, but we let it pass through for the sake of
-        # generating coherent, readable errors
-        add_error(:steps, :empty, "Can't be blank")
-      else
-        nil
-      end
-    end
   end
 end