Fixes #13814: MySQL unique index names can now contain spaces

framework/CHANGELOG.md

@@ -4,6 +4,7 @@ Yii Framework 2 Change Log
 2.0.14 under development
 ------------------------
 
+- Enh #13814: MySQL unique index names can now contain spaces (df2)
 - Bug #15300: Fixed "Cannot read property 'style' of undefined" error at the error screen (vitorarantes)
 - Enh #15426: Added abilitiy to create and drop database views (igravity, vladis84)
 - Enh #10186: Use native `hash_equals` in `yii\base\Security::compareString()` if available, throw exception if non-strings are compared (aotd1, samdark)

framework/db/mysql/Schema.php

@@ -447,11 +447,11 @@ SQL;
         $sql = $this->getCreateTableSql($table);
         $uniqueIndexes = [];
 
-        $regexp = '/UNIQUE KEY\s+([^\(\s]+)\s*\(([^\(\)]+)\)/mi';
+        $regexp = '/UNIQUE KEY\s+\`(.+)\`\s*\((\`.+\`)+\)/mi';
         if (preg_match_all($regexp, $sql, $matches, PREG_SET_ORDER)) {
             foreach ($matches as $match) {
-                $indexName = str_replace('`', '', $match[1]);
-                $indexColumns = array_map('trim', explode(',', str_replace('`', '', $match[2])));
+                $indexName = $match[1];
+                $indexColumns = array_map('trim', explode('`,`', trim($match[2], '`')));
                 $uniqueIndexes[$indexName] = $indexColumns;
             }
         }

tests/framework/db/SchemaTest.php

@@ -531,6 +531,16 @@ abstract class SchemaTest extends DatabaseTestCase
             'somecolUnique' => ['somecol'],
             'someCol2Unique' => ['someCol2'],
         ], $uniqueIndexes);
+        
+        // see https://github.com/yiisoft/yii2/issues/13814
+        $db->createCommand()->createIndex('another unique index', 'uniqueIndex', 'someCol2', true)->execute();
+
+        $uniqueIndexes = $schema->findUniqueIndexes($schema->getTableSchema('uniqueIndex', true));
+        $this->assertEquals([
+            'somecolUnique' => ['somecol'],
+            'someCol2Unique' => ['someCol2'],
+            'another unique index' => ['someCol2'],
+        ], $uniqueIndexes);
     }
 
     public function testContraintTablesExistance()