在laravel雄辩中建立了多对多的关系

Question

What is the best practice to setup many to many relationship with post and categories in laravel eloquent? Do I create a separate model for pivot table?

This is how I defined it in post model.

public function category()
{
    return $this->belongsToMany('App\Category');
}

Answer 1

you need to change the relationship method name to categories()

/**
 * The categories that belong to the product.
 */
public function categories()
{
    return $this->belongsToMany('App\Category', 'category_product');

}

category_product - is your pivot table, you can define if you change the naming convention or its optional.

In Category model, you can define it like blow

/**
 * The users that belong to the role.
 */
public function products()
{
    return $this->belongsToMany('App\Product', 'category_product');
}

If you require you can create a model for pivot table, in my case this is how i store data to pivot table (using attach method)

        $product->categories()->attach($category); //list of category id's

And you can update it again using detach method or synch method.

        $product->categories()->sync($synch); // new category id's