bug fixing using cursor

app/controllers/clients_controller.rb

@@ -49,8 +49,15 @@ class ClientsController < ApplicationController
 
   # DELETE /clients/1 or /clients/1.json
   def destroy
-    @client.destroy!
+    if @client.referenced_count > 0
+      respond_to do |format|
+        format.html { redirect_to clients_path, alert: "Client is referenced by subprojects and cannot be deleted." }
+        format.json { render json: { error: "Client has references" }, status: :unprocessable_entity }
+      end
+      return
+    end
 
+    @client.destroy!
     respond_to do |format|
       format.html { redirect_to clients_path, status: :see_other, notice: "Client was successfully destroyed." }
       format.json { head :no_content }