1 files changed, 64 insertions, 0 deletions
diff --git a/db/migrations/ChangesReferences.php b/db/migrations/ChangesReferences.php
new file mode 100644
index 00000000..d50f552e
--- /dev/null
+++ b/db/migrations/ChangesReferences.php
@@ -0,0 +1,64 @@
+<?php
+
+namespace Engelsystem\Migrations;
+
+use Illuminate\Database\Schema\Blueprint;
+
+trait ChangesReferences
+{
+    /**
+     * @param string $fromTable
+     * @param string $fromColumn
+     * @param string $targetTable
+     * @param string $targetColumn
+     * @param string $type
+     */
+    protected function changeReferences($fromTable, $fromColumn, $targetTable, $targetColumn, $type)
+    {
+        $references = $this->getReferencingTables($fromTable, $fromColumn);
+
+        foreach ($references as $reference) {
+            /** @var stdClass $reference */
+            $this->schema->table($reference->table, function (Blueprint $table) use ($reference) {
+                $table->dropForeign($reference->constraint);
+            });
+
+            $this->schema->table($reference->table,
+                function (Blueprint $table) use ($reference, $targetTable, $targetColumn, $type) {
+                    $table->{$type}($reference->column)->change();
+
+                    $table->foreign($reference->column)
+                        ->references($targetColumn)->on($targetTable)
+                        ->onDelete('cascade');
+                });
+        }
+    }
+
+    /**
+     * @param string $table
+     * @param string $column
+     * @return array
+     */
+    protected function getReferencingTables($table, $column): array
+    {
+        return $this->schema
+            ->getConnection()
+            ->select(
+                '
+                    SELECT
+                            `TABLE_NAME` as "table",
+                            `COLUMN_NAME` as "column",
+                            `CONSTRAINT_NAME` as "constraint"
+                    FROM information_schema.KEY_COLUMN_USAGE
+                    WHERE REFERENCED_TABLE_SCHEMA = ?
+                    AND REFERENCED_TABLE_NAME = ?
+                    AND REFERENCED_COLUMN_NAME = ?
+                ',
+                [
+                    $this->schema->getConnection()->getDatabaseName(),
+                    $table,
+                    $column,
+                ]
+            );
+    }
+}