Fix schema overwrite.

Author: dereuromark

src/Model/Behavior/JsonableBehavior.php

@@ -66,7 +66,9 @@ public function initialize(array $config): void {
 			throw new RuntimeException('Fields and Map need to be of the same length if map is specified.');
 		}
 		foreach ($this->_config['fields'] as $field) {
-			$this->_table->getSchema()->setColumnType($field, 'array');
+			if ($this->_table->getSchema()->getColumnType($field) !== 'json') {
+				$this->_table->getSchema()->setColumnType($field, 'json');
+			}
 		}
 		if ($this->_config['encodeParams']['options'] === null) {
 			$options = JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT | JSON_ERROR_INF_OR_NAN | JSON_PARTIAL_OUTPUT_ON_ERROR;

src/Model/Table/QueuedJobsTable.php

@@ -125,16 +125,8 @@ public function initialize(array $config): void {
 				'WorkerProcesses.workerkey = QueuedJobs.workerkey',
 			],
 		]);
-	}
-
-	/**
-	 * @return \Cake\Database\Schema\TableSchemaInterface
-	 */
-	public function getSchema(): TableSchemaInterface {
-		$schema = parent::getSchema();
-		$schema->setColumnType('data', 'json');
 
-		return $schema;
+		$this->getSchema()->setColumnType('data', 'json');
 	}
 
 	/**