Do validation errors in foreground

app/controllers/api/devices_controller.rb

@@ -35,8 +35,7 @@ module Api
     end
 
     def seed
-      Devices::CreateSeedData.delay.run!(params.as_json, device: current_device)
-      render json: { done: "Loading resources now." }
+      mutate Devices::CreateSeedData.run params.as_json, device: current_device
     end
 
     def reset

app/mutations/devices/create_seed_data.rb

@@ -18,7 +18,8 @@ module Devices
     end
 
     def execute
-      run_seeds!
+      self.delay.run_seeds!
+      { done: "Loading resources now." }
     end
 
     def seeder