collection-crud/config/packages/doctrine.yaml

parameters:
    # Adds a fallback DATABASE_URL if the env var is not set.
    # This allows you to run cache:warmup even if your
    # environment variables are not available yet.
    # You should not need to change this value.
    env(DATABASE_URL): ''

doctrine:
    dbal:
        # configure these for your database server
        driver: 'pdo_pgsql'
        types:
            money: App\Types\MoneyType
        mapping_types:
            bit: boolean
            money: money

        # With Symfony 3.3, remove the `resolve:` prefix
        url: '%env(DATABASE_URL)%'
    orm:
        auto_generate_proxy_classes: '%kernel.debug%'
        naming_strategy: doctrine.orm.naming_strategy.underscore_number_aware
        auto_mapping: true
        mappings:
            App:
                is_bundle: false
                type: attribute
                dir: '%kernel.project_dir%/src/Entity'
                prefix: 'App\Entity'
                alias: App