Alice Faker library choose random from array

Question

I am trying to generate a dummy data using AliceBundle for Symfony Framework. Everything seems to be working fine except I am looking for a way to randomly assign data from an array to a property called type. Looking at the faker library I can see that I can generate that using randomElement($array = array ('a','b','c'))

I am trying to convert that into YML and I think that is equivalent of

<randomElement(['a','b','c'])>

But this produces an error

[Nelmio\Alice\Throwable\Exception\FixtureBuilder\ExpressionLanguage\LexException] Could not lex the value "['a'".

This is my complete yml

AppBundle\Entity\Job:
    job{1..5}:
        title: <jobTitle()>
        description: <paragraph(3)>
        length: "3_months_full_time"
        type: <randomElement(['a','b','c'])>
        bonus: <paragraph(3)>
        expired_at: "2016-12-21"
        job_user: "@emp*"

Answer 1

I ended up creating a custom provider

namespace AppBundle\DataFixtures\Faker\Provider;

    class JobTypeProvider
    {
        public static function jobType()
        {
            $types = array("paid", "unpaid", "contract");
            $typeIndex = array_rand($types);
            return  $types[$typeIndex];
        }
    }

Add that to services.yml

app.data_fixtures_faker_provider.job_type_provider:
    class: AppBundle\DataFixtures\Faker\Provider\JobTypeProvider
    tags: [ { name: nelmio_alice.faker.provider } ]

And then use it in yml file

AppBundle\Entity\Job:
    job{1..50}:
        title: <jobTitle()>
        description: <paragraph(3)>
        length: <jobLength()>
        job_industry: "@title*"
        type: <jobType()>
        bonus: <paragraph(3)>
        expired_at: "2016-12-21"
        job_user: "@emp*"

Notice type: , this is being generated from service now.