Use body: nil instead of deprecated nothing:

Ideally we would be using render head status but it's issuing quite a lot of double render problems, we can improve later

app/controllers/admin/bulk_line_items_controller.rb

@@ -36,7 +36,7 @@ module Admin
           order.update_line_item_fees! @line_item
           order.update_order_fees!
           order.update!
-          render nothing: true, status: :no_content # No Content, does not trigger ng resource auto-update
+          render body: nil, status: :no_content # No Content, does not trigger ng resource auto-update
         else
           render json: { errors: @line_item.errors }, status: :precondition_failed
         end
@@ -50,7 +50,7 @@ module Admin
       authorize! :update, order
 
       @line_item.destroy
-      render nothing: true, status: :no_content # No Content, does not trigger ng resource auto-update
+      render body: nil, status: :no_content # No Content, does not trigger ng resource auto-update
     end
 
     private

app/controllers/admin/column_preferences_controller.rb

@@ -12,7 +12,7 @@ module Admin
       elsif @cp_set.errors.present?
         render json: { errors: @cp_set.errors }, status: :bad_request
       else
-        render nothing: true, status: :internal_server_error
+        render body: nil, status: :internal_server_error
       end
     end
 

app/controllers/admin/enterprise_relationships_controller.rb

@@ -23,7 +23,7 @@ module Admin
     def destroy
       @enterprise_relationship = EnterpriseRelationship.find params[:id]
       @enterprise_relationship.destroy
-      render nothing: true
+      render body: nil
     end
 
     private

app/controllers/admin/enterprise_roles_controller.rb

@@ -20,7 +20,7 @@ module Admin
     def destroy
       @enterprise_role = EnterpriseRole.find params[:id]
       @enterprise_role.destroy
-      render nothing: true
+      render body: nil
     end
 
     private

app/controllers/admin/tag_rules_controller.rb

@@ -3,7 +3,7 @@ module Admin
     respond_to :json
 
     respond_override destroy: { json: {
-      success: lambda { render nothing: true, status: :no_content }
+      success: lambda { render body: nil, status: :no_content }
     } }
 
     def map_by_tag

app/controllers/admin/variant_overrides_controller.rb

@@ -21,7 +21,7 @@ module Admin
       elsif @vo_set.errors.present?
         render json: { errors: @vo_set.errors }, status: :bad_request
       else
-        render nothing: true, status: :internal_server_error
+        render body: nil, status: :internal_server_error
       end
     end
 

app/controllers/line_items_controller.rb

@@ -29,11 +29,11 @@ class LineItemsController < BaseController
 
   def unauthorized
     status = spree_current_user ? 403 : 401
-    render(nothing: true, status: status) && return
+    render(body: nil, status: status) && return
   end
 
   def not_found
-    render(nothing: true, status: :not_found) && return
+    render(body: nil, status: :not_found) && return
   end
 
   def destroy_with_lock(item)

app/controllers/spree/admin/products_controller.rb

@@ -84,7 +84,7 @@ module Spree
         elsif product_set.errors.present?
           render json: { errors: product_set.errors }, status: :bad_request
         else
-          render nothing: true, status: :internal_server_error
+          render body: nil, status: :internal_server_error
         end
       end
 

app/controllers/stripe/webhooks_controller.rb

@@ -10,7 +10,7 @@ module Stripe
       handler = WebhookHandler.new(@event)
       result = handler.handle
 
-      render nothing: true, status: status_mappings[result] || 200
+      render body: nil, status: status_mappings[result] || 200
     end
 
     private
@@ -20,9 +20,9 @@ module Stripe
       signature = request.headers["HTTP_STRIPE_SIGNATURE"]
       @event = Webhook.construct_event(payload, signature, Stripe.endpoint_secret)
     rescue JSON::ParserError
-      render nothing: true, status: :bad_request
+      render body: nil, status: :bad_request
     rescue Stripe::SignatureVerificationError
-      render nothing: true, status: :unauthorized
+      render body: nil, status: :unauthorized
     end
 
     # Stripe interprets a 4xx or 3xx response as a failure to receive the webhook,

lib/spree/core/controller_helpers/common.rb

@@ -46,7 +46,7 @@ module Spree
                        formats: [:html],
                        layout: nil
               }
-              type.all { render status: :not_found, nothing: true }
+              type.all { render status: :not_found, body: nil }
             end
           end