refactor shared data method

Author: PedroAugustoRamalhoDuarte

lib/inertia_rails/controller.rb

@@ -60,11 +60,7 @@ def default_render
     end
 
     def shared_data
-      # Theses variables are set in the before_action, but we need to ensure they are initialized when using renderer alone
-      @_inertia_shared_plain_data ||= {}
-      @_inertia_shared_blocks ||= []
-
-      @_inertia_shared_plain_data.merge(evaluated_blocks)
+      (@_inertia_shared_plain_data || {}).merge(evaluated_blocks)
     end
 
     def redirect_to(options = {}, response_options = {})
@@ -108,7 +104,7 @@ def capture_inertia_errors(options)
     end
 
     def evaluated_blocks
-      @_inertia_shared_blocks&.map { |block| instance_exec(&block) }&.reduce(&:merge) || {}
+      (@_inertia_shared_blocks || []).map { |block| instance_exec(&block) }.reduce(&:merge) || {}
     end
   end
 end