OPENEUROPA-1739: Ensure Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE exists b…

…y requiring simfony/yaml >=3.1.

composer.json

@@ -10,12 +10,16 @@
         "consolidation/robo": "^1.4",
         "gitonomy/gitlib": "^1.0",
         "nuvoleweb/robo-config": "^0.2.1",
-        "jakeasmith/http_build_url": "^1.0.1"
+        "jakeasmith/http_build_url": "^1.0.1",
+        "symfony/yaml": ">=3.1"
     },
     "require-dev": {
         "openeuropa/code-review": "~1.0.0-beta3",
         "phpunit/phpunit": "~5.5||~6.0"
     },
+    "_readme": [
+        "We need require a version of 'symfony/yaml' equal or higher then '3.1' since versions before don't have dumper 'DUMP' constants available."
+    ],
     "autoload": {
         "psr-4": {
             "OpenEuropa\\TaskRunner\\": "./src/"

src/Commands/AbstractDrupalCommands.php

@@ -341,14 +341,7 @@ public function servicesSetup(array $options = [
         // Read given parameters.
         $service_parameters['parameters'] = $this->getConfig()->get('drupal.service_parameters');
         $dumper = new Dumper(2);
-        // Set flag to be compatible with symfony/yaml versions 2.x.x. (see https://github.com/symfony/yaml/blob/2.8/Dumper.php#L53)
-        if (property_exists(Yaml::class, 'DUMP_EXCEPTION_ON_INVALID_TYPE')) {
-            $flag = Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE;
-        } else {
-            $flag = true;
-        }
-
-        $yaml = $dumper->dump($service_parameters, PHP_INT_MAX, 0, $flag);
+        $yaml = $dumper->dump($service_parameters, PHP_INT_MAX, 0, Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE);
 
         // Set the destination file.
         $services_destination_file = $options['root'] . '/sites/' . $options['sites-subdir'] . '/services.yml';