如何使用Laravel 4将数据从一个表链接到另一个表？

Question

I have a customers migration table

Schema::create('customers', function(Blueprint $table) {
    $table->increments('id');
    $table->string('name');
    $table->string('address');
    $table->string('phone');
    $table->string('email');
});

and a tripsheet migration table which goes like this

Schema::create('tripsheets', function(Blueprint $table) {
    $table->increments('id');
    $table->integer('tripsheet_num');
    $table->integer('customer_id');
    $table->string('date');
    $table->string('customer_name');
    $table->string('customer_address');
    $table->string('customer_phone');
    $table->string('rep_address');
    $table->string('rep_phone');
});

I have also created a customer eloquent,

class Customer extends Eloquent {

    public $timestamps = true;
    public $table = 'customers';
    protected $fillable = ['name', 'address', 'phone', 'email'];

    public function tripsheets(){
        return $this->belongsTo('Tripsheet', 'name', 'address', 'phone');
    }
}

and a tripsheet model,

class Tripsheet extends Eloquent {

    public $timestamps = true;
    public $table = 'tripsheets';
    protected $fillable = [];

    public function customer(){
        return $this->hasMany('Customer', 'name', 'address', 'phone');
    }
}

and my routes.php goes like this,

Route::get('/', function()
{
    return View::make('hello');
});

Route::controller('/customers', 'CustomerController');
Route::controller('/tripsheets', 'TripsheetController');

I would like to link the customer_name, customer_address, customer_phone from the tripsheet table to the name, address, phone of the customer table. I also want to know how to route them and fetch them as a json data to be used by angular JS to display the result.

now should i create a third table to link these two? Or should i call it with Customer::with('tripsheets')->all(); in the routes/controller?

I also want to know how to route them and fetch them as a json data to be used by angular JS to display the result.?

Answer 1

I overlooked your code and after user315.. answer I see the problem. The belongsTo and hasMany has wrong arguments.

You need to change your code to the following to make it work:

class Customer extends Eloquent {
    public function tripsheets(){
        return $this->belongsTo('Tripsheet', 'tripsheet_num');
    }
}

class Tripsheet extends Eloquent {
    public function customer(){
        return $this->hasMany('Customer', 'tripsheet_num');
    }
}

The problem is that you have the field tripsheet_num in the table tripsheets . Laravel tries to find a field called tripsheet_id inside the tripsheets table when you use the belongsTo(Tripsheet) on Customer . In your case this key field is named different and is not found, and so the relation is not set.

Same goes for hasMany() only then it looks in the other table for the key field.

See the relation documentation for more info: One-to-one relation & hasMany

Answer 2

You only need the first argument in your belongsTo and hasMany method. The others are likely the reason why it's not working. They are meant for telling Eloquent what the foreign key is, and if you are specifying the foreign key as name , then it's obviously not going to work right.

Since you have proper naming conventions, Eloquent can accurately guess what they should be and you shouldn't need them.