Support Laravel 6.0

lazychaser#399 (comment)

Author: mewebstudio

composer.json

@@ -13,9 +13,9 @@
 
     "require": {
         "php": ">=7.2",
-        "illuminate/support": "~5.7.0|~5.8.0|~6.0.0",
-        "illuminate/database": "~5.7.0|~5.8.0|~6.0.0",
-        "illuminate/events": "~5.7.0|~5.8.0|~6.0.0"
+        "illuminate/support": "~5.7.0|~5.8.0|^6.0",
+        "illuminate/database": "~5.7.0|~5.8.0|^6.0",
+        "illuminate/events": "~5.7.0|~5.8.0|^6.0"
     },
 
     "autoload": {

src/QueryBuilder.php

@@ -723,13 +723,12 @@ protected function getDuplicatesQuery()
 
         $waFirst = $this->query->getGrammar()->wrapTable($firstAlias);
         $waSecond = $this->query->getGrammar()->wrapTable($secondAlias);
-        $pk = $this->model->getKeyName();
 
         $query = $this->model
             ->newNestedSetQuery($firstAlias)
             ->toBase()
             ->from($this->query->raw("{$table} as {$waFirst}, {$table} {$waSecond}"))
-            ->whereRaw("{$waFirst}.{$keyName} < {$waSecond}.{$keyName}")
+            ->whereRaw("{$waFirst}.id < {$waSecond}.id")
             ->whereNested(function (BaseQueryBuilder $inner) use ($waFirst, $waSecond) {
                 list($lft, $rgt) = $this->wrappedColumns();