adapt migrations files to flex

migrations/Version20141128194409.php

@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**
@@ -10,7 +10,7 @@ use Doctrine\DBAL\Schema\Schema;
  */
 class Version20141128194409 extends AbstractMigration
 {
-    public function up(Schema $schema)
+    public function up(Schema $schema): void
     {
         $this->addSql("CREATE TABLE Country (id INT NOT NULL, name JSON NOT NULL, countryCode VARCHAR(3) NOT NULL, PRIMARY KEY(id));");
         $this->addSql("CREATE TABLE centers (id INT NOT NULL, name VARCHAR(255) NOT NULL, PRIMARY KEY(id));");
@@ -48,7 +48,7 @@ class Version20141128194409 extends AbstractMigration
         $this->addSql("ALTER TABLE user_groupcenter ADD CONSTRAINT FK_33FFE54A7EC2FA68 FOREIGN KEY (groupcenter_id) REFERENCES group_centers (id) ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE;");
     }
 
-    public function down(Schema $schema)
+    public function down(Schema $schema): void
     {
         // this down() migration is auto-generated, please modify it to your needs
 

migrations/Version20150821105642.php

@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Doctrine\ORM\Query\ResultSetMapping;
@@ -28,7 +28,7 @@ class Version20150821105642 extends AbstractMigration implements
     /**
      * @param Schema $schema
      */
-    public function up(Schema $schema)
+    public function up(Schema $schema): void
     {
         // this up() migration is auto-generated, please modify it to your needs
         $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
@@ -39,8 +39,20 @@ class Version20150821105642 extends AbstractMigration implements
 
     }
     
-    public function postUp(Schema $schema)
+    public function postUp(Schema $schema): void
     {
+        /*
+         * Before the upgrade to symfony version 4, this code worked.
+         * 
+         * But it doesn't work any more after the migration and currently this
+         * code should note be necessary.
+         * 
+         * This code is kept for reference, and may be re-activated if needed, but
+         * the probability that this will happens is near 0
+         */
+        return;
+        
+        
         //transform data from groupcenter_permissionsgroup table
         $em = $this->container->get('doctrine.orm.entity_manager');
         
@@ -110,7 +122,7 @@ class Version20150821105642 extends AbstractMigration implements
     /**
      * @param Schema $schema
      */
-    public function down(Schema $schema)
+    public function down(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
 

migrations/Version20150821122935.php

@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**
@@ -14,7 +14,7 @@ class Version20150821122935 extends AbstractMigration
     /**
      * @param Schema $schema
      */
-    public function up(Schema $schema)
+    public function up(Schema $schema): void
     {
         
         $this->addSql('DROP TABLE groupcenter_permissionsgroup');
@@ -25,7 +25,7 @@ class Version20150821122935 extends AbstractMigration
     /**
      * @param Schema $schema
      */
-    public function down(Schema $schema)
+    public function down(Schema $schema): void
     {
         $this->addSql('ALTER TABLE group_centers ALTER permissionsGroup_id SET DEFAULT NULL');
         $this->addSql('CREATE TABLE groupcenter_permissionsgroup (groupcenter_id INT NOT NULL, permissionsgroup_id INT NOT NULL, PRIMARY KEY(groupcenter_id, permissionsgroup_id))');

migrations/Version20160310122322.php

@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**
@@ -13,7 +13,7 @@ class Version20160310122322 extends AbstractMigration
     /**
      * @param Schema $schema
      */
-    public function up(Schema $schema)
+    public function up(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
 
@@ -52,7 +52,7 @@ class Version20160310122322 extends AbstractMigration
     /**
      * @param Schema $schema
      */
-    public function down(Schema $schema)
+    public function down(Schema $schema): void
     {
         $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'postgresql', 'Migration can only be executed safely on \'postgresql\'.');
 

migrations/Version20180703191509.php

@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**

migrations/Version20180709181423.php

@@ -2,7 +2,7 @@
 
 namespace Application\Migrations;
 
-use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\Migrations\AbstractMigration;
 use Doctrine\DBAL\Schema\Schema;
 
 /**