The constrained() method is a shorthand in Laravel's migration schema builder that helps you quickly define a foreign key constraint for a column.

$table->foreignId('column_name')->constrained('table_name');

• Automatically creates a foreign key constraint on the specified column.
• Infers the referenced table if not explicitly provided. For example, user_id would refer to the users table by default.
• Assumes the foreign key references the id column of the referenced table.

Example

Schema::create('posts', function (Blueprint $table) {
    $table->id();
    $table->foreignId('user_id')->constrained(); // References `users.id` by default
    $table->timestamps();
});

Equivalent to:

Schema::create('posts', function (Blueprint $table) {
    $table->id();
    $table->unsignedBigInteger('user_id');
    $table->foreign('user_id')->references('id')->on('users');
    $table->timestamps();
});

Status: #idea
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