add a default behaviour on adding scope column

To ensure backward-compatibility, add a default scope during schema modification, if reports are already present in database.

Resources/migrations/Version20150622233319.php

@@ -4,12 +4,33 @@ namespace Application\Migrations;
 
 use Doctrine\DBAL\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
+use Symfony\Component\DependencyInjection\ContainerAwareInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Chill\MainBundle\Entity\Scope;
+
 
 /**
  * Add a scope to report
  */
-class Version20150622233319 extends AbstractMigration
+class Version20150622233319 extends AbstractMigration 
+    implements ContainerAwareInterface
 {
+    /**
+     *
+     * @var ContainerInterface
+     */
+    private $container;
+
+    public function setContainer(ContainerInterface $container = null)
+    {
+        if ($container === NULL) {
+            throw new \RuntimeException('Container is not provided. This migration '
+                    . 'need container to set a default center');
+        }
+        
+        $this->container = $container;
+    }
+    
     /**
      * @param Schema $schema
      */
@@ -19,10 +40,52 @@ class Version20150622233319 extends AbstractMigration
                 'Migration can only be executed safely on \'postgresql\'.');
 
         $this->addSql('ALTER TABLE report ADD scope_id INT DEFAULT NULL');
+        
+        //add a default scope
+        $scopes = $this->container->get('doctrine.orm.default_entity_manager')
+              ->getRepository('ChillMainBundle:Scope')
+              ->findAll();
+        
+        if (count($scopes) > 0) {
+            $defaultScopeId = $scopes[0]->getId();
+        } else {
+            //check if there are data in report table
+            $nbReports = $this->container->get('doctrine.orm.default_entity_manager')
+                  ->createQuery('SELECT count(r.id) FROM ChillReportBundle:Report r')
+                  ->getSingleScalarResult();
+            
+            if ($nbReports > 0) {
+                //create a default scope
+                $scope = new Scope();
+                //create name according to installed languages
+                $locales = $this->container
+                      ->getParameter('chill_main.available_languages');
+                $names = array();
+                foreach($locales as $locale) {
+                    $names[$locale] = 'default';
+                }
+                $scope->setName($names);
+                //persist
+                $this->container->get('doctrine.orm.default_entity_manager')
+                      ->persist($scope);
+                $this->container->get('doctrine.orm.default_entity_manager')
+                      ->flush();
+                //default scope is the newly-created one
+                $defaultScopeId = $scope->getId();
+            }
+        }
+
         $this->addSql('ALTER TABLE report DROP scope'); //before this migration, scope was never used
         $this->addSql('ALTER TABLE report ADD CONSTRAINT FK_report_scope '
                 . 'FOREIGN KEY (scope_id) '
                 . 'REFERENCES scopes (id) NOT DEFERRABLE INITIALLY IMMEDIATE');
+        
+        if (isset($defaultScopeId)){
+            $this->addSql('UPDATE report SET scope_id = :id', array(
+               'id' => $defaultScopeId
+            ));
+        }
+        $this->addSql('ALTER TABLE report ALTER COLUMN scope_id SET NOT NULL');
         $this->addSql('CREATE INDEX IDX_report_scope ON report (scope_id)');
     }
 
@@ -34,8 +97,8 @@ class Version20150622233319 extends AbstractMigration
         $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'postgresql', 
                 'Migration can only be executed safely on \'postgresql\'.');
 
-        $this->addSql('ALTER TABLE Report DROP CONSTRAINT FK_C38372B2682B5931');
+        $this->addSql('ALTER TABLE Report DROP CONSTRAINT FK_report_scope');
-        $this->addSql('DROP INDEX IDX_C38372B2682B5931');
+        $this->addSql('DROP INDEX IDX_report_scope');
         $this->addSql('ALTER TABLE Report ADD scope VARCHAR(255) DEFAULT NULL');
         $this->addSql('ALTER TABLE Report DROP scope_id');
     }