init commit

api/app/Database/Schema/Blueprint.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace App\Database\Schema;
+
+use Illuminate\Database\Schema\Blueprint as BaseBlueprint;
+
+class Blueprint extends BaseBlueprint
+{
+    private const MAX_INDEX_NAME_LENGTH = 64;
+    private const MAX_FRAGMENT_INDEX_LEGNTH = 4;
+    private const MIN_FRAGMENT_INDEX_LEGNTH = 3;
+
+    /**
+     * Create a default index name for the table.
+     *
+     * @param  string  $type
+     * @param  array  $columns
+     * @return string
+     */
+    protected function createIndexName($type, array $columns)
+    {
+        $index = $this->getReducedIndexName($type, $columns, self::MAX_FRAGMENT_INDEX_LEGNTH);
+
+        return str_replace(['-', '.'], '_', $index);
+    }
+
+    private function getReducedIndexName($type, array $columns, int $fragmentLength)
+    {
+        $table = null;
+
+        foreach($columns as $key => $value) {
+            $column = null;
+
+            foreach(explode('_', $value) as $explode) {
+                $column .= substr($explode, 0, $fragmentLength) . '_';
+            }
+
+            $columns[$key] = rtrim($column, '_');
+        }
+
+        foreach(explode('_', $this->table) as $explode) {
+            $table .= substr($explode, 0, $fragmentLength) . '_';
+        }
+
+        $index = strtolower($this->prefix.rtrim($table, '_').'_'.implode('_', $columns).'_'.$type);
+
+        if (strlen($index) > self::MAX_INDEX_NAME_LENGTH) {
+
+            $newFragmentLength = $fragmentLength - 1;
+
+            if ($newFragmentLength < self::MIN_FRAGMENT_INDEX_LEGNTH) {
+
+                throw new \Exception("An error has occurred while reducing the length of the index. "
+                    . "Please, name it manually.\nThe last try result in: {$index}.");
+            }
+
+            return $this->getReducedIndexName($type, $columns, $newFragmentLength);
+        }
+
+        return $index;
+    }
+}