Laravel: How to set the Primary Key and Foreign Key to string

问题

I'm not using the auto increment for the id instead i'm using the 32 char unique id. So when i create a relationship and query, im getting a null because my FK expecting int my models

class User extend Eloquent {
    public $incrementing = false; 
}

class Reservation extend Eloquent {
    public $incrementing = false; 
}

so when i query this

$reservations = Reservation::with('user')->where('user_id', '=', '22beb4892ba944c8b1895855e1d4d1ad')->get();
i could not retrieve the users information but the reservations info is working fine
when i try to listen for query. eg:
Event::listen('illuminate.query', function($query, $bindings, $time, $name){
    var_dump($query);
    var_dump($bindings);
});

i get this

string(46) "select * from `reservation` where `user_id` = ?"
array(1) {
  [0]=>
  string(36) "22beb4892ba944c8b1895855e1d4d1ad"
}
string(53) "select * from `user` where `user`.`id` in (?)"
array(1) {
  [0]=>
  int(0)
}

the problem is in the second query i could not retrieve the users info because the user.id expecting int.

回答1:

First, with innoDB you could make those foreing keys without problem

InnoDB allows a foreign key constraint to reference a non-unique key. This is an InnoDB extension to standard SQL.

Mabe you have your tables wrong, try this

For Reservations

    Schema::create('reservations', function($table)
    {
        $table->engine = 'InnoDB';
        $table->string('id', 32)->index();
        $table->string('name', 128);
        $table->string('user_id', 32)->references('id')->on('users');
        $table->timestamps();
    });

for users

    Schema::create('users', function($table)
    {
        $table->engine = 'InnoDB';
        $table->string('id', 32)->index();
        $table->string('name', 128);
        $table->timestamps();
    });

then you need to create the relationship in reservations

public function user(){
    return $this->belongsTo('User', 'user_id');
}

and now when you search

$reservations = Reservation::with('user')->where('user_id', '=', '22beb4892ba944c8b1895855e1d4d1ad')->get();

it must work! i've tested this code.

来源：https://stackoverflow.com/questions/22692054/laravel-how-to-set-the-primary-key-and-foreign-key-to-string

标签

laravel

laravel-4