SQLSTATE [42S22]：找不到列：1054“字段列表”中的未知列“type_article_id”

Question

I have three columns: article , type_article and theme . The article table has two foreign keys, which are type and theme.

Article migration

public function up()
{
    Schema::create('article', function (Blueprint $table) {
        $table->bigIncrements('id_article');
        $table->unsignedBigInteger('type');
        $table->unsignedBigInteger('theme');
        $table->string('titre');
        $table->string('contenu');
        $table->date('date_creation');
        $table->foreign('type')->references('id')
            ->on('type_article')->onDelete('cascade');
        $table->foreign('theme')->references('id')->on('theme')
            ->onDelete('cascade');
    });
}

Article model

class Article extends Model
{
    use HasFactory;

    protected $table = 'article';
    protected $primaryKey = 'id_article';
    public $timestamps = false;

    public function type_article()
    {
        return $this->belongsTo(Type_Article::class);
    }

    public function theme()
    {
        return $this->belongsTo(Theme::class);
    }
}

Type_article and Theme has this (except the end 'type' for 'type_article' and 'theme' for 'theme':

public function article()
{
    return $this->hasMany('App\Article', 'type');
}  

They both have a primary key id.

What I'm trying to do here is to fill a simple form with a title, an article type (with foreach loop inside my view (it's working), a theme, and content.

As you can see, inside the error message (SQL: insert into article (type_article_id, theme, titre, contenu, date_creation) . There are only five elements; the id of the article is not there. II do not have a type_article_id inside my table, I don't really know where it comes from, but I do create an article_id

Answer 1

You are not specifying the key to be used for the belongsTo relationship. When you do not define this, Eloquent has to assume the name; this naming is done by the relationship method name, type_article , + _id = type_article_id .

You need to tell the relationship to be using a different foreign key for the relationship as it does not fit with the automatic naming via convention:

$this->belongsTo(Type_Article::class, 'type');

This field should probably be named type_id to fit in with conventions better.

"Eloquent determines the default foreign key name by examining the name of the relationship method and suffixing the method name with a _ followed by the name of the primary key column. However, if the foreign key on the Comment model is not post_id , you may pass a custom key name as the second argument to the belongsTo method"

Laravel 8.x Docs - Eloquent - Relationships - One to Many (Inverse)

You are not showing how you are inserting a record, which is an important thing.