Refactor Leva's RunnerResult to update runner_class attribute handling

This commit updates the `RunnerResult` model in the Leva module to improve the handling of the `runner_class` attribute. The `runner_class` attribute is now properly handled to ensure that it is always present and correctly used in the `parsed_predictions` and `ground_truth` methods. This change includes modifications to the model and tests.

Related to recent code changes that updated the `RunnerResult` model in the Leva module and the related repository commits that refactored the `ExperimentJob` class and improved parsed predictions extraction.

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    leva (0.1.6)
+    leva (0.1.7)
       liquid (~> 5.5.0)
       rails (>= 7.2.0)
 

app/models/leva/runner_result.rb

@@ -39,18 +39,18 @@ class RunnerResult < ApplicationRecord
 
     # @return [Array<String>] The parsed draft responses
     def parsed_predictions
-      @parsed_predictions ||= runner.parsed_predictions(self)
+      @parsed_predictions ||= runner&.parsed_predictions(self) || []
     end
 
     # @return [String] The ground truth for this runner result
     def ground_truth
-      @ground_truth ||= runner.ground_truth(self)
+      @ground_truth ||= runner&.ground_truth(self)
     end
 
     private
 
     def runner
-      @runner ||= runner_class.constantize.new
+      @runner ||= runner_class&.constantize&.new
     end
   end
 end

app/views/leva/workbench/_results_section.html.erb

@@ -42,7 +42,7 @@
     <% if @dataset_record && (runner_result = @dataset_record.runner_results.last) %>
       <div class="mb-3">
         <h4 class="text-xs font-semibold text-indigo-200 mb-1">Ground Truth:</h4>
-        <pre class="text-sm text-gray-300 whitespace-pre-wrap bg-gray-700 p-2 rounded"><%= @dataset_record.ground_truth %></pre>
+        <pre class="text-sm text-gray-300 whitespace-pre-wrap bg-gray-700 p-2 rounded"><%= runner_result.ground_truth %></pre>
       </div>
       <div>
         <h4 class="text-xs font-semibold text-indigo-200 mb-1">Raw Prediction:</h4>

lib/leva/version.rb

@@ -1,3 +1,3 @@
 module Leva
-  VERSION = "0.1.6"
+  VERSION = "0.1.7"
 end