feat: add topic model

src/modules/topic/topic.model.ts

@@ -0,0 +1,29 @@
+import { IsOptional, IsString, MaxLength } from 'class-validator'
+
+import { index, modelOptions, prop } from '@typegoose/typegoose'
+
+import { BaseModel } from '~/shared/model/base.model'
+
+@modelOptions({
+  options: {
+    customName: 'Topic',
+  },
+})
+@index({ name: 1 })
+export class TopicModel extends BaseModel {
+  @prop({ default: '' })
+  @MaxLength(400, { message: '描述信息最多 400 个字符' })
+  @IsOptional()
+  @IsString({ message: '描述信息必须是字符串' })
+  description?: string
+
+  @prop()
+  @IsString({ message: '简介必须是字符串' })
+  introduce: string
+
+  @prop({ unique: true })
+  name: string
+
+  @prop({ unique: true })
+  id: string
+}

src/modules/topic/topic.module.ts

@@ -0,0 +1,4 @@
+import { Module } from '@nestjs/common'
+
+@Module({})
+export class TopicModule {}