Wrong number of arguments Ruby Rails

Why This Happens

In Ruby on Rails, a method was called with the wrong number of parameters. This is one of the most common Ruby on Rails errors developers encounter. Understanding the root cause helps you fix it quickly and prevent it from recurring.

The Problem

def greet(name)
  puts name
end
greet('Alice', 'Bob')

The Fix

def greet(name, greeting = 'Hello')
  puts "#{greeting}, #{name}"
end

Step-by-Step Fix

1. 1

   Identify the error

   Look at the error message: ArgumentError: wrong number of arguments. This tells you exactly what went wrong.

2. 2

   Find the cause

   Check the stack trace to find which line of your Ruby on Rails code triggered this error.

3. 3

   Apply the fix

   Use the corrected code pattern shown above. Test to confirm the error is resolved.