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    # 在 iCHEF 以 Apollo + React 導入 GraphQL 的經驗 - 張登皓 {%hackmd yEJ_rTxzTWa2K450RqmT8w %} > 從這開始 ## 那個 RESTful 的年代 `GET /resource/{:id}/relation/{:relation_id}` * 一個資源一個 endpoint * 多個資源 = 多個 request * 回傳的內容 / 格式不如預期 * 沒有文件 * 在 React 內資料放在 Redux ### 說到 REDUX... > REACT + REDUX + REDUX-SAGA * Redux (state management) * Saga (async management) ### 用 Stoplight 建立 API 文件 缺點: - 需要前後端額外去維護,容易忘記更新 - 年久失修 ## GraphQL - 用型別定義你的資料 ### [Graph"i"QL](https://github.com/graphql/graphiql) Schema = 文件,可快速試用API [GraphiQL online](https://lucasconstantino.github.io/graphiql-online/) ### Mutation = RESTful 的 `POST`/`PUT`/`PATCH` ### RESTful v.s. GraphQL | RESTful | GraphQL | |:--------:|:--------:| | 通常好幾個Endpoint | 單一Endpoint 入口 | | Request次數多(橫跨多資源時) | Request次數少(大部份時候) | | API 回你什麼就是什麼 | 回傳資料相對可預期 | | 文件維護麻煩 | 可做到 Schema 即文件 | ### 有個老問題還是在 - REACT(Container/Component $\uparrow$) - REDUX(action/reducer $\uparrow$) - REDUX-SAGA ### Apollo + REACT - 同時支援 React + iOS - 把 GraphQL 操作封裝起來 - 內建 Request 機制 - 內建 Cache 機制 - 基本使用超簡單 ### Apollo Fetch Policy - cache-first $\rightarrow$ (預設)優先找 cache ,找不到才抓 - cache-and-network $\rightarrow$ 先從cache顯示,同時抓更新資料 - network-only $\rightarrow$ 無視 cache,永遠從 API 抓 - cache-only $\rightarrow$ 永遠從 cache 拿,拿不到就噴 error - no-cache $\rightarrow$ 永遠從 API 抓,而且不寫進 cache ### 稍微再做得更好一點 - 在 query 時,包進預設行為,==打包自訂行為的 query==。 - mutation 完順便重抓 query。 - 直接從 cache 讀資料 ### 好像不太 GraphQL 的地方 目前還是以 resources 為單位重用 API $\leftarrow$ 較方便管理 > $^{ex.}$已有一取得餐廳的 query,也有一取得 menu 的 query,現在想取餐廳 + menu,需要再一個新的 query 嗎? No! $\rightarrow$ 若將來 schema 有改,容易漏掉更新。 ### Quick Recap - GraphQL $\rightarrow$ Facebook 發明的一種資料查詢語言 ### Hooks 的出現 讓 Component 更 readable $\rightarrow$ Tech Stack: Apollo + Hooks ###### tags: `MW19`

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