update

app/Http/Controllers/Admin/SupplyDemandController.php

@@ -271,7 +271,9 @@ class SupplyDemandController extends BaseController
 
         // 当期供需发布分页
         $list = SupplyDemand::with(['user', 'dialogues' => function ($query) {
-            $query->with('user', 'toUser')->limit(2)->orderBy('created_at', 'desc');
+            $query->with(['user', 'toUser', 'messages' => function ($q) {
+                $q->orderBy('created_at', 'desc');
+            }])->limit(2)->orderBy('created_at', 'desc');
         }])->where(function ($query) use ($type) {
             if ($type) {
                 $query->where('type', $type);

app/Models/Dialogue.php

@@ -15,8 +15,14 @@ class Dialogue extends SoftDeletesModel
         return $this->hasOne(User::class, 'id', 'to_user_id');
     }
 
-    public function supplyDemand(){
+    public function supplyDemand()
+    {
         return $this->hasOne(SupplyDemand::class, 'id', 'supply_demand_id');
     }
 
+    public function messages()
+    {
+        return $this->hasMany(Message::class, 'dialogue_id', 'id');
+    }
+
 }