fix mixed case column names for unique indexes in postgres

fixes #10613

framework/CHANGELOG.md

@@ -56,6 +56,7 @@ Yii Framework 2 Change Log
 - Bug #11878: Fixed i18n gettext fallback language message loading (stevekr)
 - Enh #11212: Added headers to PO file in `yii\i18n\GettextPoFile::save()` (stevekr)
 - Bug #6347: `inverseOf()` not working for dynamic relational queries (laszlovl)
+- Bug #10613: Fixed PostgreSQL Schema to return correct column names for unique indexes that have mixed case column names (cebe)
 
 
 2.0.8 April 28, 2016

framework/db/pgsql/Schema.php

@@ -370,7 +370,13 @@ SQL;
 
         $rows = $this->getUniqueIndexInformation($table);
         foreach ($rows as $row) {
-            $uniqueIndexes[$row['indexname']][] = $row['columnname'];
+            $column = $row['columnname'];
+            if (!empty($column) && $column[0] === '"') {
+                // postgres will quote names that are not lowercase-only
+                // https://github.com/yiisoft/yii2/issues/10613
+                $column = substr($column, 1, -1);
+            }
+            $uniqueIndexes[$row['indexname']][] = $column;
         }
 
         return $uniqueIndexes;

tests/framework/db/SchemaTest.php

@@ -377,4 +377,40 @@ abstract class SchemaTest extends DatabaseTestCase
         $this->assertSame('', $columnSchema->dbTypecast(''));
     }
 
+    public function testFindUniqueIndexes()
+    {
+        $db = $this->getConnection();
+
+        try {
+            $db->createCommand()->dropTable('uniqueIndex')->execute();
+        } catch(\Exception $e) {
+        }
+        $db->createCommand()->createTable('uniqueIndex', [
+            'somecol' => 'string',
+            'someCol2' => 'string',
+        ])->execute();
+
+        /* @var $schema Schema */
+        $schema = $db->schema;
+
+        $uniqueIndexes = $schema->findUniqueIndexes($schema->getTableSchema('uniqueIndex', true));
+        $this->assertEquals([], $uniqueIndexes);
+
+        $db->createCommand()->createIndex('somecolUnique', 'uniqueIndex', 'somecol', true)->execute();
+
+        $uniqueIndexes = $schema->findUniqueIndexes($schema->getTableSchema('uniqueIndex', true));
+        $this->assertEquals([
+            'somecolUnique' => ['somecol'],
+        ], $uniqueIndexes);
+
+        // create another column with upper case letter that fails postgres
+        // see https://github.com/yiisoft/yii2/issues/10613
+        $db->createCommand()->createIndex('someCol2Unique', 'uniqueIndex', 'someCol2', true)->execute();
+
+        $uniqueIndexes = $schema->findUniqueIndexes($schema->getTableSchema('uniqueIndex', true));
+        $this->assertEquals([
+            'somecolUnique' => ['somecol'],
+            'someCol2Unique' => ['someCol2'],
+        ], $uniqueIndexes);
+    }
 }