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[SOUND] Welcome back.

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We're making significant progress.

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And now that we've created our models and
migrations,

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we're ready to dive into factories and
seeders.

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So why do we need to use factories and
seeders?

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Imagine you want to add some test data for
our API but

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you don't want to manually define
all of the individual attributes for

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each model,
which can be a tedious development task.

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Instead, we're going to use model
factories to generate large amounts of

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database records for each model instance
using the powerful Faker library.

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To learn more about factories and seeders,
check out the teachers notes below.

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Let's get started.

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The factories, migrations and the seeds
folders are inside of the app/database

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directory, where you'll also find
the DatabaseSeeder.php file.

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Which we'll populate with to seeders,
AuthorsTableSeeder and

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BooksTableSeeder, using two
artisan commands like this.

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To test our connection,
use the php artisan migrate:fresh command.

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As you can see, we now have two
seeders in our seeds directory.

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AuthorsTableSeeder and BooksTableSeeder.

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We're making great progress, and

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we're ready to test our seeders by
using the db:seed command, like this.

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If everything went well,
you should see a message that reads,

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database seeding completed successfully.

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Also note that they're both empty at
the moment, but that's because we

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have not specified values for each column,
which we will do later in the course.

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Finally, let's add both seeders to
the DatabaseSeeder.php file inside

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of the run function, like this.

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Currently, our seeders are empty
because we haven't defined them yet.

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So let's open the UserFactory.php file,
which is a default Laravel factory.

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And let's take a look at the defined
user factory data inside.

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As you can see,
the test data has defined the name, email,

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email_verified_at, password and
remember_token attributes,

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which is similar to how we're going to
define the author and book factories.

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Let's go ahead and

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delete the userfactory.php file since we
won't be using that file in this project.

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Now that we've created the author and
book seeders and

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added them to the DatabaseSeeder.php file,

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we're ready to specify some test data for
the AuthorTableSeeder and

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BooksTableSeeder files inside
of the public run function.

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Inside of the public run function,
we'll specify values for each column.

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However, instead of manually
specifying the test data for

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each column, we can use model factories
and a robust library named Faker.

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Next, let's open the
AuthorsTableSeeder.php file to take a look

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at the public run function inside,
which, again, is currently empty.

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Inside of the run function,
let's add our defined seed data for

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each column in our database tables.

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First, create two factories,
the author factory and

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book factory,
using these two artisan commands.

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Ctrl+K will clear the terminal,

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php artisan make:factory AuthorFactory.

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And,

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Next, open the AuthorFactory.php file and

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change Model::class to Author::class, and

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modify the import at the top from
use App\Model to use App\Author.

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Next, let's open the authors_table
migration, so we can define the seed

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data while looking at the database
tables side by side, like this.

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Before we move on to defining the book
factory, we need to connect the author

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factory to the AuthorsTableSeeder file to
create three author instances, like this.

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Next, let's test our AuthorsTableSeeder
using the php artisan db:seed command.

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If everything went well,
you'd see a message that says,

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database seeding completed successfully.

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And more importantly,

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you'd see that the AuthorsTableSeeder
took a little bit longer to complete,

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in my case, 0.5 seconds, but this is
because we generated some test data.

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In comparison, the BooksTableSeeder
completed in 0 seconds because

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there was no test data to generate.

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Way to go.

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Next, let's apply the same treatment to

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the BookTableSeeder by opening
the BookFactory.php file,

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then change Model::Class to Book::class,
and

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modify the import at the top from
use App\Model to use App\Book.

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Next, let's open the Books table so

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we can define the seed data while looking
at the database tables side by side.

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Finally, we need to connect the book
factory to the BooksTableSeeder.php file,

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as we did with the AuthorsTableSeeder.php
file in the public run function,

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like this.

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To test our work,

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let's use the php artisan migrate fresh
command to wipe out the previous data.

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Followed by the php artisan db:seed
command to reseed our test data.

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If all went well, you should see
messages that look like this.

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Way to go