Let us take learn how to add unique constraint Laravel migration with the support of our Laravel support services at Bobcares.

Why add a unique constraint in a Laravel migration?

Using migrations, we can add a unique constraint to a database table in Laravel.

A unique constraint assures that a particular column or set of columns in a table has unique values across all rows. This avoids repeated entries and maintains data integrity.

How to add a unique constraint in a Laravel migration?

Here’s how to include a one-of-a-kind constraint in a Laravel migration:

1. Creating a new migration:

   To create a new migration file, use the Artisan command make:migration.

   For example, to establish a new migration for the table “users,” use the command:

   bash
php artisan make:migration add_unique_constraint_to_users_table --table=users
2. Editing the migration file:

   Navigate to the database/migrations directory and double-click the produced migration file.

   Use the unique technique to define the unique constraint on the specified column(s) in the up method.

   To add a unique constraint to the email column of the users table, for example, use the unique method as follows:

   php
public function up()
{
Schema::table('users', function (Blueprint $table) {
$table->unique('email');
});
}
3. Running the migration:

   Run the migration command to apply the migration and add the unique constraint to the table:

   php artisan migrate

   The unique constraint will be applied to the given column(s) in the database table once the migration is completed.

   Laravel will throw an exception if we try to insert or edit a record with a value that violates the unique constraint.

   Note that we may send an array of column names to the unique function to create a unique constraint across several columns. As an example:

   php
$table->unique(['column1', 'column2']);

   Remember to modify the table and column names in the migration file to meet the individual needs.

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Conclusion

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