動的ページ作成

lib/strapi.ts

   const guitars: Guitar[] = await response.json().then((json) => json.data);
   return guitars;
 };
+
+/**
+ * Guitar情報取得処理
+ */
+export const fetchGuitarDetail = async (id: string): Promise<Guitar> => {
+  // StrapiのAPIを呼び出し
+  const response = await fetch(
+    `${process.env.NEXT_PUBLIC_STRAPI_URL}/api/guitars/${id}?populate=*`
+  );
+  // apiのresponseからdata部のみ取り出し
+  const guitar: Guitar = await response.json().then((json) => json.data);
+  return guitar;
+};

next.config.js

 /** @type {import('next').NextConfig} */
 const nextConfig = {
   reactStrictMode: true,
-}
+  images: {
+    domains: ["res.cloudinary.com"],
+  },
+};
 
-module.exports = nextConfig
+module.exports = nextConfig;

pages/guitar/[id].tsx

+import React, { FC } from "react";
+import { GetStaticPaths, GetStaticProps, GetStaticPropsContext } from "next";
+import { fetchGuitarDetail, fetchGuitars } from "../../lib/strapi";
+import { ParsedUrlQuery } from "querystring";
+import { Guitar } from "../../type/guitars";
+import Image from "next/image";
+
+const Detail: FC<Props> = ({ guitar }) => {
+  return (
+    <div>
+      <div>ID: {guitar?.id}</div>
+      <div>名前：{guitar?.attributes.name}</div>
+      <div>説明：{guitar?.attributes.description}</div>
+      <div>
+        <Image
+          src={guitar?.attributes.image.data[0].attributes.url}
+          height={240}
+          width={560}
+        />
+      </div>
+    </div>
+  );
+};
+
+interface Props {
+  guitar: Guitar;
+}
+
+interface IParams extends ParsedUrlQuery {
+  id: string;
+}
+
+// ===============================
+// 静的サイト作成時にはgetStaticPropsの中で
+// 表示データを作成する
+// ===============================
+export const getStaticProps: GetStaticProps = async (ctx) => {
+  const { id } = ctx.params as IParams;
+  const guitar = await fetchGuitarDetail(id);
+  return {
+    props: {
+      guitar,
+    },
+  };
+};
+
+// ================================
+// 表示可能なデータを取得する
+// ================================
+export const getStaticPaths: GetStaticPaths = async () => {
+  const guitars = await fetchGuitars();
+  // とりうるIDの一覧を取得する
+  const paths = guitars.map((guitars) => ({
+    params: {
+      id: guitars.id.toString(),
+    },
+  }));
+
+  return {
+    paths,
+    fallback: true,
+  };
+};
+
+export default Detail;