// models/CodeExample.ts import mongoose, { Schema, Document } from 'mongoose'; export interface ICodeExample extends Document { title: string; content: string; level: 'basic' | 'intermediate' | 'advanced'; createdAt: Date; updatedAt: Date; } const codeExampleSchema = new Schema({ title: { type: String, required: true }, content: { type: String, required: true }, level: { type: String, required: true, enum: ['basic', 'intermediate', 'advanced'] }, createdAt: { type: Date, default: Date.now }, updatedAt: { type: Date, default: Date.now } }, { timestamps: true // 自动管理 createdAt 和 updatedAt }); export const CodeExample = mongoose.model('CodeExample', codeExampleSchema);