Impossible to db:seed laravel

Thomas C. :

Good morning,

I can't send data from my factory to my database.

SQLSTATE[HY000]: General error: 1364 Field 'genre_id' doesn't have a default value (SQL: insert into `books` (`isbn`, `title`, `publish_date`, `updated_at`, `created_at`) values (4243421897, Prof., 1992-09-08 00:57:41, 2020-03-10 15:02:36, 2020-03-10 15:02:36))

I don't know if in my migrations I have to specify that my foreign_keys don't have default values...

These are my files:

create_books_table.php

 public function up()
    {
        Schema::create('books', function (Blueprint $table) {
            $table->engine = 'InnoDB';

            $table->id('isbn');
            $table->string('title' , 100);
            $table->text('cover')->nullable();
            $table->date('publish_date');
            $table->bigInteger('genre_id')->unsigned();
            $table->bigInteger('author_id')->unsigned();
            $table->bigInteger('user_id')->unsigned();
            $table->timestamps();

            $table->foreign('genre_id')
                ->references('id')->on('Genres')
                ->onUpdate('cascade')
                ->onDelete('cascade');

            $table->foreign('author_id')
                ->references('id')->on('Authors')
                ->onUpdate('cascade')
                ->onDelete('cascade');

            $table->foreign('user_id')
                ->references('id')->on('Readers')
                ->onUpdate('cascade')
                ->onDelete('cascade');
        });
    }

BookFactory.php

$factory->define(Book::class, function (Faker $faker) {
    return [
        'isbn' => $faker->isbn10,
        'title' => $faker->title,
        'publish_date' => $faker->dateTime()
    ];
});

I haven't yet created a 'Route' in my web.php so I haven't done the CRUD too, I haven't even modified my blades but I just want to set up my whole database for the moment. But I wonder if that's not the problem.

Here's a schematic from my database : https://imgur.com/a/8Txn7x2 (I'm not allowed to upload images yet. )

(i'm in coding school)

Thank you!

Aken Roberts :

You've defined your genre_id column as being required, or always containing a value. Your insert query, though, is not including a genre_id value. In this case, MySQL will fall back to look for a default value configured for the column, but you haven't defined one.

A default value doesn't make much sense for a foreign key style column like genre_id, unless you have a specific reason to specify a default ID to be used when one isn't explicitly provided.

The better choice would be to make the column nullable, or able to use a NULL value instead of an existing ID. Modify the line in your migration to:

$table->bigInteger('genre_id')->unsigned()->nullable();

When a foreign key column is nullable, it won't perform any assertions for the NULL value, only non-null values.

Impossible to db:seed laravel

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