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Duplicate Entry Error in Laravel - How to Fix

This error occurs when trying to insert a duplicate value into a column with a unique constraint.

The Error

Error Message 
SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry

Common Causes

  1. 1 Inserting duplicate value in unique column
  2. 2 Primary key conflict
  3. 3 Unique index violation
  4. 4 Race condition in concurrent requests

Solutions

1

Use firstOrCreate to avoid duplicates

PHP 
$user = User::firstOrCreate(
    ['email' => $email],
    ['name' => $name, 'password' => $password]
);
2

Use updateOrCreate for upsert behavior

PHP 
$user = User::updateOrCreate(
    ['email' => $email],
    ['name' => $name]
);
3

Add validation for unique fields

PHP 
$request->validate([
    'email' => 'required|email|unique:users,email',
]);

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