AI Search 设计模式

# AI Search 开发模式 ## search() vs aiSearch() | 用途 | 方法 | 返回值 | |-----|--------|---------| | 自定义 UI、分析 | `search()` | 仅原始分块 (~100-300ms) | | 聊天机器人、问答 | `aiSearch()` | AI 响应 + 分块 (~500-2000ms) | ## rewrite_query (查询重写) | 设置 | 使用场景 | |---------|----------| | `true` | 用户输入（存在拼写错误、模糊查询） | | `false` | LLM 生成的查询（已优化） | ## 多租户（基于文件夹） typescript const answer = await env.AI.autorag("saas-docs").aiSearch({ query: "refund policy", model: "@cf/meta/llama-3.3-70b-instruct-fp8-fast", filters: { column: "folder", operator: "gte", // "以...开头" 模式 value: `tenants/${tenantId}/` } }); ## 流式传输 typescript const stream = await env.AI.autorag("docs").aiSearch({ query, model: "@cf/meta/llama-3.3-70b-instruct-fp8-fast", stream: true }); return new Response(stream, { headers: { "Content-Type": "text/event-stream" } }); ## 分数阈值 (Score Threshold) | 阈值 | 用途 | |-----------|-----| | 0.3 (默认) | 广泛召回，探索性搜索 | | 0.5 | 平衡，生产环境默认 | | 0.7 | 高精度，关键准确性要求 | ## 提示词模板 (System Prompt) typescript const systemPrompt = `You are a documentation assistant. - Answer ONLY based on provided context - If context doesn't contain answer, say "I don't have information" - Include code examples from context`; ## 复合过滤器 typescript // OR: 多个文件夹 filters: { operator: "or", filters: [ { column: "folder", operator: "gte", value: "docs/api/" }, { column: "folder", operator: "gte", value: "docs/auth/" } ] } // AND: 文件夹 + 日期 filters: { operator: "and", filters: [ { column: "folder", operator: "gte", value: "docs/" }, { column: "timestamp", operator: "gte", value: oneWeekAgoSeconds } ] } ## 重排序 (Reranking) 在高风险场景下启用（增加约 300ms 延迟）： typescript reranking: { enabled: true, model: "@cf/baai/bge-reranker-base" }