sql,laravel,migration , How to delete only the table relationed


How to delete only the table relationed

Question:

Tag: sql,laravel,migration

I know how to create the migrations with laravel 5.1 and I have the following code

 public function up()
    {
        Schema::create('articulos', function (Blueprint $table) {
            $table->increments('id');
            $table->string('title');
            $table->string('content');
            $table->integer('categoria_id')->unsigned();
            $table->integer('creador_id')->unsigned();
            $table->string('slug', 32);
            $table->timestamps();
        });
        Schema::table('articulos', function($table) {
            $table->foreign('categoria_id')->references('id')->on('categorias');
            $table->foreign('creador_id')->references('id')->on('users');
        });
    }

When I try to delete a category with articles , I have an error with foreign key , it's anny possibility to drop this category ?


Answer:

When creating a foreign key constraint, you can also decide what should happen with the constraints. For instance, if you want to delete all articles when a category is deleted (as I guess is your question):

    Schema::table('articulos', function($table) {
        $table->foreign('categoria_id')->references('id')->on('categorias')->onDelete('cascade');
        $table->foreign('creador_id')->references('id')->on('users');
    });

Also see documentation. The cascade identifies to the database that on deletion of a categorias entry, the table should cascade the action into the articulos table.

To further clarify the options in this foreign constraint, you can use:

More information for MySQL. Please note that foreign key constraint are not necessary for Laravel to support relations. Sometimes you might not need a foreign key.

Also note aside from the onDelete you can also use onUpdate.


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