Quick Answer

Systematic approach to nil-related errors.

Understanding the Issue

These errors indicate your code isn't properly handling nil cases. Analyze where nil comes from and add guards.

The Problem

This code demonstrates the issue:

Ruby Error 
# Problem: Chain of methods
current_user.address.street # Error if any is nil

The Solution

Here's the corrected code:

Ruby Fixed 
# Solution 1: Safe navigation
current_user&.address&.street

# Solution 2: Defensive methods
def safe_street(user)
  return unless user&.address
  user.address.street
end

Key Takeaways

Assume any method chain could contain nil.