catchup typeorm thing

things/nest-typeorm/src/dto/ReturnMessage.dto.ts

@@ -55,32 +55,51 @@ export class BlankPaginatedReturnMessageDto
   }
 }
 
-export class ReturnMessageDto<T>
-  extends BlankReturnMessageDto
-  implements ReturnMessage<T> {
-  @ApiProperty({ description: '返回内容' })
-  data?: T;
-  constructor(statusCode: number, message?: string, data?: T) {
+type AnyClass = new (...args: any[]) => any;
+type ClassOrArray = AnyClass | [AnyClass];
+type TypeFromClass<T> = T extends new (...args: any[]) => infer U ? U : never;
+export type ParseType<T extends ClassOrArray> = T extends [infer U]
+  ? TypeFromClass<U>[]
+  : TypeFromClass<T>;
+
+function getClass(o: ClassOrArray) {
+  return o instanceof Array ? o[0] : o;
+}
+
+export function ReturnMessageDto<T extends ClassOrArray>(type: T) {
+  const cl = class SpecificReturnMessage extends BlankReturnMessageDto {
+    data?: ParseType<T>;
+    constructor(statusCode: number, message?: string, data?: ParseType<T>) {
       super(statusCode, message);
       this.data = data;
     }
+  };
+  ApiProperty({ description: '返回数据', type })(cl.prototype, 'data');
+  Object.defineProperty(cl, 'name', {
+    value: `${getClass(type).name}ReturnMessageDto`,
+  });
+  return cl;
 }
 
-export class PaginatedReturnMessageDto<T>
-  extends BlankPaginatedReturnMessageDto
-  implements PageSettingsWise {
-  @ApiProperty({ description: '返回内容' })
-  data: T[];
+export function PaginatedReturnMessageDto<T extends AnyClass>(type: T) {
+  const cl = class SpecificPaginatedReturnMessageDto extends BlankPaginatedReturnMessageDto implements PageSettingsWise {
+    data?: TypeFromClass<T>[];
     constructor(
       statusCode: number,
       message: string,
-    data: T[],
+      data: TypeFromClass<T>[],
       total: number,
       pageSettings: PageSettingsWise,
     ) {
       super(statusCode, message, total, pageSettings);
       this.data = data;
     }
+  }
+  ApiProperty({ description: '返回数据', type: [type] })(cl.prototype, 'data');
+  Object.defineProperty(cl, 'name', {
+    value: `${getClass(type).name} PaginatedReturnMessageDto`,
+  });
+  return cl;
 }
 
 export class StringReturnMessageDto
@@ -88,4 +107,9 @@ export class StringReturnMessageDto
   implements ReturnMessage<string> {
   @ApiProperty({ description: '返回内容' })
   data?: string;
+
+  constructor(statusCode: number, message?: string, data?: string) {
+    super(statusCode, message);
+    this.data = data;
+  }
 }