Add a new migration to use '0' as default value for the 'instance' co…

…lumn of 'circles_members' table

NOTE: We can't use an empty string ('') as default value, because it doesn't work with 'Doctrine\DBAL\Schema\Table::changeColumn()' method...

Revert commit f79cc52

Signed-off-by: Tortue Torche <tortuetorche@users.noreply.github.com>

lib/Migration/Version0017Date20200202112903.php

@@ -45,6 +45,7 @@ class Version0017Date20200202112903 extends SimpleMigrationStep {
 	/** @var IDBConnection */
 	private $connection;
 
+
 	/**
 	 * @param IDBConnection $connection
 	 */
@@ -89,7 +90,6 @@ public function changeSchema(IOutput $output, Closure $schemaClosure, array $opt
 			'instance', 'string', [
 						  'notnull' => false,
 						  'length'  => 255,
-						  'default' => '',
 					  ]
 		);
 		$table->addColumn(

lib/Migration/Version0017Date20200214112607.php

@@ -0,0 +1,79 @@
+<?php
+/**
+ * Circles - Bring cloud-users closer together.
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @copyright 2019
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+namespace OCA\Circles\Migration;
+
+use Closure;
+use Doctrine\DBAL\Schema\SchemaException;
+use Doctrine\DBAL\Types\Type;
+use OCP\DB\ISchemaWrapper;
+use OCP\IDBConnection;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+/**
+ * Auto-generated migration step: Please modify to your needs!
+ */
+class Version0017Date20200214112607 extends SimpleMigrationStep {
+
+
+	/** @var IDBConnection */
+	private $connection;
+
+
+	/**
+	 * @param IDBConnection $connection
+	 */
+	public function __construct(IDBConnection $connection) {
+		$this->connection = $connection;
+	}
+
+
+	/**
+	 * @param IOutput $output
+	 * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+	 * @param array $options
+	 *
+	 * @return null|ISchemaWrapper
+	 * @throws SchemaException
+	 */
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options) {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		$table = $schema->getTable('circles_members');
+		$table->changeColumn(
+			'instance', [
+						  'default' => '0',
+					  ]
+		);
+
+		return $schema;
+	}
+
+}