Why does RELAXed Web Services Not appear in the module list?

Question

I have created a new Drupal 8 site with docker. I created it with composer and installed the drupal/deploy and relaxedws/replicator modules. The drupal/deploy module and all of its dependencies seem to be installed correctly, they show up in the Extend area of Drupal, and they seem to work properly. The relaxedws/replicator does not show up as expected. I expect to see it in the Web Services section of the Extend page in Drupal.

The relaxedws/replicator module shows up on the file system in the vendor folder in the Drupal root.

It seems like I'm missing something.

Dockerfile:

    FROM drupal:latest

    RUN apt-get update && apt-get install -y \
        curl \
        git \
        mysql-client \
        vim \
        wget

    RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" && \
        php composer-setup.php && \
        mv composer.phar /usr/local/bin/composer && \
        php -r "unlink('composer-setup.php');"

    RUN wget -O drush.phar https://github.com/drush-ops/drush-launcher/releases/download/0.4.2/drush.phar && \
        chmod +x drush.phar && \
        mv drush.phar /usr/local/bin/drush

    RUN rm -rf /var/www/html/*

    COPY apache-drupal.conf /etc/apache2/sites-enabled/000-default.conf

    WORKDIR /app

    RUN composer create-project drupal-composer/drupal-project:8.x-dev /app --stability dev --no-interaction

    RUN mkdir -p /app/config/sync

    RUN chown -R www-data:www-data /app/web

    RUN composer require relaxedws/replicator:dev-master

    RUN composer require drupal/deploy

Resulting composer.json

{
    "name": "drupal-composer/drupal-project",
    "description": "Project template for Drupal 8 projects with composer",
    "type": "project",
    "license": "GPL-2.0-or-later",
    "authors": [
        {
            "name": "",
            "role": ""
        }
    ],
    "repositories": [
        {
            "type": "composer",
            "url": "https://packages.drupal.org/8"
        }
    ],
    "require": {
        "composer/installers": "^1.2",
        "cweagans/composer-patches": "^1.6",
        "drupal-composer/drupal-scaffold": "^2.2",
        "drupal/console": "^1.0.2",
        "drupal/core": "~8.5.3",
        "drupal/deploy": "^1.0@beta",
        "drush/drush": "^9.0.0",
        "relaxedws/replicator": "dev-master",
        "vlucas/phpdotenv": "^2.4",
        "webflo/drupal-finder": "^1.0.0",
        "webmozart/path-util": "^2.3"
    },
    "require-dev": {
        "webflo/drupal-core-require-dev": "~8.5.3"
    },
    "conflict": {
        "drupal/drupal": "*"
    },
    "minimum-stability": "dev",
    "prefer-stable": true,
    "config": {
        "sort-packages": true
    },
    "autoload": {
        "classmap": [
            "scripts/composer/ScriptHandler.php"
        ],
        "files": ["load.environment.php"]
    },
    "scripts": {
        "drupal-scaffold": "DrupalComposer\\DrupalScaffold\\Plugin::scaffold",
        "pre-install-cmd": [
            "DrupalProject\\composer\\ScriptHandler::checkComposerVersion"
        ],
        "pre-update-cmd": [
            "DrupalProject\\composer\\ScriptHandler::checkComposerVersion"
        ],
        "post-install-cmd": [
            "DrupalProject\\composer\\ScriptHandler::createRequiredFiles"
        ],
        "post-update-cmd": [
            "DrupalProject\\composer\\ScriptHandler::createRequiredFiles"
        ]
    },
    "extra": {
        "installer-paths": {
            "web/core": ["type:drupal-core"],
            "web/libraries/{$name}": ["type:drupal-library"],
            "web/modules/contrib/{$name}": ["type:drupal-module"],
            "web/profiles/contrib/{$name}": ["type:drupal-profile"],
            "web/themes/contrib/{$name}": ["type:drupal-theme"],
            "drush/contrib/{$name}": ["type:drupal-drush"]
        }
    }
}

** EDIT 1 I attempted the fix mentioned by @sonfd (and say thanks for the answer). I changed my extra.installer-paths to the following but the path for the installed package didn't change.

    "extra": {
        "installer-paths": {
            "web/core": ["type:drupal-core"],
            "web/libraries/{$name}": ["type:drupal-library"],
            "web/modules/contrib/{$name}": ["type:drupal-module"],
            "web/profiles/contrib/{$name}": ["type:drupal-profile"],
            "web/themes/contrib/{$name}": ["type:drupal-theme"],
            "drush/contrib/{$name}": ["type:drupal-drush"],
            "web/modules/{$name}": ["relaxedws/replicator"]
        }
    }

Answer 1

Composer installs things based on the informations in extras.installer-paths in your composer.json, or to the vendor directory by default. You can place the package anywhere you want by following the steps at How do I install a package to a custom path for my framework?. Basically you need to update your extra.installer-paths area to look something like:

"extra": {
    "installer-paths": {
        "web/core": ["type:drupal-core"],
        "web/libraries/{$name}": ["type:drupal-library"],
        "web/modules/contrib/{$name}": ["type:drupal-module"],
        "web/profiles/contrib/{$name}": ["type:drupal-profile"],
        "web/themes/contrib/{$name}": ["type:drupal-theme"],
        "drush/contrib/{$name}": ["type:drupal-drush"],
        "path/to/desirable/package/location": ["relaxedws/replicator"]
    }
}

Note the additional line for relaxedws/replicator at the bottom.

Note: I would composer remove relaxedws/replicator before updating the installer paths and then reinstall with composer require relaxedws/replicator. I don't think composer will move the package to the new location otherwise, but maybe it would with some form of a composer update command.

Answer 2

I found the answer to my problem. It didn't have to do with package placement, but package selection. I was not adding the correct package. As I stumbled and grumbled, the packagist website did not show the package I was looking for. https://packagist.org/packages/?q=drupal%2Frelax&p=0

What helped me find it was getting a few packages incorrect when adding them with composer require <some_non_existent_package_name>. When you do this composer will offer suggestions as to what you might be looking for. I then used this to search for packages.

In the end, the package I was actually looking for was called drupal/relaxed. The package I mentioned above in the question relaxedws/replicator is a prerequisite and not the actual Drupal package.

composer require drupal/relaxed

Back story: This was all in an effort to get Drupal 8 Deploy working. The documentation never points to installing this package. Hopefully this helps.

https://www.drupal.org/docs/8/modules/deploy/drupal-to-drupal-deployment-between-two-or-more-sites