fix more query builder methods

Author: taylorotwell

src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php

@@ -1115,6 +1115,29 @@ public function lazyById($chunkSize = 1000, $column = null, $alias = null)
         });
     }
 
+    /**
+     * Query lazily, by chunking the results of a query by comparing IDs in descending order.
+     *
+     * @param  int  $chunkSize
+     * @param  string|null  $column
+     * @param  string|null  $alias
+     * @return \Illuminate\Support\LazyCollection
+     */
+    public function lazyByIdDesc($chunkSize = 1000, $column = null, $alias = null)
+    {
+        $column ??= $this->getRelated()->qualifyColumn(
+            $this->getRelatedKeyName()
+        );
+
+        $alias ??= $this->getRelatedKeyName();
+
+        return $this->prepareQueryBuilder()->lazyByIdDesc($chunkSize, $column, $alias)->map(function ($model) {
+            $this->hydratePivotRelation([$model]);
+
+            return $model;
+        });
+    }
+
     /**
      * Get a lazy collection for the given query.
      *

src/Illuminate/Database/Eloquent/Relations/HasManyThrough.php

@@ -692,6 +692,23 @@ public function lazyById($chunkSize = 1000, $column = null, $alias = null)
         return $this->prepareQueryBuilder()->lazyById($chunkSize, $column, $alias);
     }
 
+    /**
+     * Query lazily, by chunking the results of a query by comparing IDs in descending order.
+     *
+     * @param  int  $chunkSize
+     * @param  string|null  $column
+     * @param  string|null  $alias
+     * @return \Illuminate\Support\LazyCollection
+     */
+    public function lazyByIdDesc($chunkSize = 1000, $column = null, $alias = null)
+    {
+        $column ??= $this->getRelated()->getQualifiedKeyName();
+
+        $alias ??= $this->getRelated()->getKeyName();
+
+        return $this->prepareQueryBuilder()->lazyByIdDesc($chunkSize, $column, $alias);
+    }
+
     /**
      * Prepare the query builder for query execution.
      *