Laravel 4 Migration error - creates two auto_increment primary keys fields

Question

I made a migration with this setup:

$table->increments('id');
$table->integer('user_id', 10)->unsigned(); // this is meant to be used as a foreign key

After doing php artisan migrate it returns an error:

[Exception]                                                                                                                                                                                 
SQLSTATE[42000]: Syntax error or access violation: 1075 Incorrect table definition;
there can be only one auto column and it must be defined as a key (SQL: create table `transactions` (`id` int unsigned not null auto_increment primary key, `user_id` int unsigned not null auto_increment primary key) default character set utf8 collate utf8_unicode_ci) (Bindings: array ())

I didn't specify user_id to be an auto_increment primary key but Migration treats it as so.

How can I make a foreign key in Migrations?

Answer 1

@crynobone: Second parameter are for boolean use to determine primary key, there no length option for integer.

Refer here: https://github.com/laravel/laravel/issues/2212#issuecomment-21608193

Answer 2

In Laravel 4 , second parameter in integer function is for indicating the integer column to be auto incremented or not ( and therefore primary key or not ) In my case , to add an auto incremented id in a table I write it like that

$table->integer('id' , true);

It creates an integer column with 11 digits .

Answer 3

Why not specify user_id as primary key with autoincrement?

$table->increments('user_id');
// other columns
...

Schema builder create user_id, which is 10 digits long, unsigned & primary key.