alshamsan

alshamsan

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Level 2
7,970 XP
Oct
17
1 week ago
Activity icon

Replied to Error Setting Up One-to-Many Relationship With Custom Foreign Key

Got it.

So properties have precedence over relationships.

Thanks man @tykus

Activity icon

Replied to Error Setting Up One-to-Many Relationship With Custom Foreign Key

hi @tykus

Thanks for the answer.

How is this a problem since I'm explicitly defining the foreign key name?

Edit

I updated the column name to country_code as suggested, and it actually worked.

For anyone wondering, this is what I changed.

Schema::create('users', function (Blueprint $table) {
    $table->id();
    $table->string('name');
    $table->string('email')->unique();
    $table->timestamp('email_verified_at')->nullable();
    $table->string('password');
    $table->string('country_code'); // changed country to country_code
    $table->foreign('country_code')->references('code')->on('countries')->onUpdate('cascade'); //same
    $table->rememberToken();
    $table->timestamps();
});

and in the User.php model:

public function country()
{
    return $this->belongsTo(Country::class, 'country_code', 'code');
}

I still can't wrap it around my head, why should the original code not work? What is the problem with having the property name same as the relationship name? (since we have explicitly told Laravel about the custom foreign key name )

Activity icon

Started a new Conversation Error Setting Up One-to-Many Relationship With Custom Foreign Key

Issue

I am trying to set up a One-to-Many relationship between Country and User models, using a custom foreign key, instead of the conventional country_id column (users->country references countries->code).

Consider the following tables:

countries table:

| id | name         | code | language |
|----|--------------|------|----------|
| 1  | Canada       | ca   | English  |
| 2  | India        | in   | Hindi    |
| 3  | France       | fr   | French   |

users Table:

| id | name         | email           | country |
|----|--------------|-----------------|---------|
| 1  | Craig Harris | [email protected] | ca      |
| 2  | Tracy Hunt   | [email protected] | fr      |
| 3  | Lalita Gopal | [email protected] | in      |

How can I tell laravel to reference users->country to countries->code and be able to load the Country model of of the User? Something similar to the below:

How i want to use it is like this:

{{ $user->country->name }}

This is my attempt:

Migrations

Users Table Migration:

Schema::create('users', function (Blueprint $table) {
    $table->id();
    $table->string('name');
    $table->string('email')->unique();
    $table->string('password');
    $table->string('country');
    $table->foreign('country')->references('code')->on('countries')->onUpdate('cascade');
    $table->timestamps();
});

Countries Table Migration:

Schema::create('countries', function (Blueprint $table) {
    $table->id();
    $table->string('code')->unique();
    $table->string('name');
    $table->string('language');
    $table->timestamps();
});

Models

User Model User.php

public function country()
{
    return $this->belongsTo(Country::class, 'country', 'code');
}

Country Model Country.php

public function users()
{
    return $this->hasMany(User::class, 'country', 'code');
}

Note: I used a custom foreign_key and local_key as I understood from the docs here.

View & Rote

Route file web.php

Route::get('/', function () {
    $users = User::with('country')->paginate(10);
    return view('users.index', ['users' => $users]);
});

my view file users/index.blade.php

<ul>
    @foreach ($users as $user)
    <li>{{ $user->country->name }}</li>
    @endforeach
</ul>

Error

I get the following error:

Trying to get property 'name' of non-object (View: ... /views/users/index.blade.php)

What am I doing wrong? :/