减库存算法

@@ -188,12 +188,53 @@ class Goods extends Model
      * @return mixed
      */
     public function getDepot($goodsId,$areaId,$number){
-        $depot = $this->alias('g')
+        $arr = [];//仓库对应需扣除库存信息
+        //获取全部仓库库存
+        $sum_stock_num = $this->alias('g')
+            ->join('fa_depot d','g.id=d.goods_id')
+            ->where(['g.id' => $goodsId, 'd.area_id' => $areaId])
+            ->field('d.id,d.stock_num')
+            ->sum('d.stock_num');
+        if($number > $sum_stock_num){
+            return '库存不足';
+        }
+        //获取当前省仓库库存
+        $province_depot = $this->alias('g')
             ->join('fa_depot d','g.id=d.goods_id')
             ->where(['g.id' => $goodsId, 'd.area_id' => $areaId])
             ->field('d.id,d.stock_num')
             ->find();
-       $this->recursion($depot,'',$number,$goodsId);
+        $province_stock_num = !empty($province_depot['stock_num']) ? $province_depot['stock_num'] : 0;
+        $residue_number = $number - $province_stock_num;//还需多少库存
+        if($residue_number > 0){
+            //需要其它仓库提供库存
+            $arr1['area_id'] = $areaId;
+            $arr1['number'] = $province_stock_num;
+            $arr[] = $arr1;
+            $depots = $this->alias('g')
+                ->join('fa_depot d','g.id=d.goods_id')
+                ->where(['g.id' => $goodsId, 'd.area_id' => ['not in'=>[$areaId]]])
+                ->field('d.id,d.stock_num')->select();
+            foreach($depots as $key => $depot){
+                $arr1['area_id'] = $depot['area_id'];
+                if($depot['stock_num'] < $residue_number){
+                    //还是不够
+                    $arr1['number'] = $depot['stock_num'];
+                    $arr[] = $arr1;
+                    $residue_number = $residue_number - $depot['stock_num'];
+                }else{
+                    //足够
+                    $arr1['number'] = $residue_number;
+                    $arr[] = $arr1;
+                }
+            }
+        }else{
+            $arr1['area_id'] = $areaId;
+            $arr1['number'] = $number;
+            $arr[] = $arr1;
+        }
+        return $arr;
+       /*$this->recursion($depot,'',$number,$goodsId);
 
 
         if (!empty($depot) && $number == 0){
@@ -201,7 +242,7 @@ class Goods extends Model
         }else{
             $depotid = Db::name('depot')->where('goods_id',$goodsId)->order('weigh DESC')->value('id');
             return $depotid;
-        }
+        }*/
     }
 
     public function recursion($depot,$ids,$number,$goodsId){