Remove it from cache after change a problem's id

models/common.ts

@@ -77,8 +77,12 @@ export default class Model extends TypeORM.BaseEntity {
   async destroy() {
     const id = (this as any).id;
     await TypeORM.getManager().remove(this);
-    if ((this.constructor as typeof Model).cache) {
+    await (this.constructor as typeof Model).deleteFromCache(id);
-      cacheSet(this.constructor.name, id, null);
+  }
+
+  static async deleteFromCache(id) {
+    if (this.cache) {
+      cacheSet(this.name, id, null);
     }
   }
 

models/problem.ts

@@ -536,6 +536,7 @@ export default class Problem extends Model {
 
     let oldTestdataDir = this.getTestdataPath(), oldTestdataZip = this.getTestdataArchivePath();
 
+    const oldID = this.id;
     this.id = id;
 
     // Move testdata
@@ -549,6 +550,9 @@ export default class Problem extends Model {
     }
 
     await this.save();
+
+    await Problem.deleteFromCache(oldID);
+    await problemTagCache.del(oldID);
   }
 
   async delete() {