Laravel 5.8 : Always give multiple primary key syntax or access violation error - eloquent

Question

I have created migration file with composite primary key but always gives an error
syntax error or access violation : 1068 multiple primary key defined (sql : alter table 'table_currency' add primary key table_currency_code_user_id_primary('code', 'user_id'))
Schema::create('table_currency', function (Blueprint $table) {
$table->string('code', 3);
$table->bigIncrements('user_id');
$table->string('default', 3);
$table->enum('is_active', ['0','1'])->default('0')->comment('0: Inactive, 1: Active');
$table->timestamps();
$table->primary(['code', 'user_id']);
});
I don't get it why i got this error ? Thanx in advance.

Answer 1

If you want to make a composite primary key on ['user_id', 'code'] you need to remove the primary attached on your increments column. You can do this with this code:
Schema::create('table_currency', function (Blueprint $table) {
$table->bigIncrements('user_id'); // Has a primary key
$table->dropPrimary('table_currency_user_id_primary'); // Remove the primary key from the increments column
$table->primary(['code', 'user_id']); // Set your composite primary key
$table->string('code', 3);
$table->string('default', 3);
$table->enum('is_active', ['0','1'])->default('0')->comment('0: Inactive, 1: Active');
$table->timestamps();
});