fix: Resolve QR code generation errors in ticket PDF creation

- Add validation in TicketPdfGenerator to ensure QR code data integrity
- Use compact() to remove nil values from QR code data hash
- Add error handling in Ticket#generate_qr_code with fallback generation
- Validate QR code data before passing to RQRCode library
- Add proper error logging for QR code generation failures
- Prevent "data must be a String, QRSegment, or an Array" errors

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/models/ticket.rb

@@ -63,6 +63,10 @@ class Ticket < ApplicationRecord
       self.qr_code = SecureRandom.uuid
       break unless Ticket.exists?(qr_code: qr_code)
     end
+  rescue => e
+    Rails.logger.error "Failed to generate QR code for ticket: #{e.message}"
+    # Generate a simple fallback QR code
+    self.qr_code = "#{id || 'temp'}-#{Time.current.to_i}-#{SecureRandom.hex(4)}"
   end
 
 

app/services/ticket_pdf_generator.rb

@@ -63,12 +63,22 @@ class TicketPdfGenerator
       pdf.text "Ticket QR Code", align: :center
       pdf.move_down 10
 
+      # Ensure all required data is present before generating QR code
+      if ticket.qr_code.blank?
+        raise "Ticket QR code is missing"
+      end
+
       qr_code_data = {
         ticket_id: ticket.id,
         qr_code: ticket.qr_code,
-        event_id: ticket.event.id,
+        event_id: ticket.event&.id,
-        user_id: ticket.user.id
+        user_id: ticket.user&.id
-      }.to_json
+      }.compact.to_json
+
+      # Validate QR code data before creating QR code
+      if qr_code_data.blank? || qr_code_data == "{}"
+        raise "QR code data is empty or invalid"
+      end
 
       qrcode = RQRCode::QRCode.new(qr_code_data)
       pdf.print_qr_code(qrcode, extent: 120, align: :center)