Next.js:用于嵌套动态路由的getStaticPaths

Question

假设您有这样的数据结构：

const data = {
  posts: [{
    id: 1,
    title: "Post 1"
    slug: "post-1"
  }, {
    id: 2,
    title: "Post 2"
    slug: "post-2"
  }],

  comments: [{
    id: 1,
    postId: "post-1",
    text: "Comment 1 for Post 1"
  }, {
    id: 2,
    postId: "post-1",
    text: "Comment 2 for Post 1"
  }, {
    id: 3,
    postId: "post-2",
    text: "Comment 1 for Post 2"
  }]
}

A您有以下路由/posts/[postId[/[commentId]，所以Next.js结构文件夹是：posts/[postId]/[commented].js

然后，您需要为该路由生成静态路径。

我编码如下：

export async function getStaticPaths() {
  const { posts, comments } = data
  const paths = posts.map((post) => {
    return comments
      .filter((comment) => comment.postId === post.slug)
      .map((comment) => {
        return {
          params: {
            postId: post.slug,
            commentId: comment.id
          }
        }
      })
  })
}

但这不管用。抛出的错误是：

Error: Additional keys were returned from `getStaticPaths` in page "/clases/[courseId]/[lessonId]". URL Parameters intended for this dynamic route must be nested under the `params` key, i.e.:

        return { params: { postId: ..., commentId: ... } }

Keys that need to be moved: 0, 1.

如何将数据“映射”或“循环”到正确的返回格式？提前感谢！

Answer 1

问题似乎在于，您从形状错误的getStaticPaths数据中返回这个值：

[
  [ { params: {} }, { params: {} } ],
  [ { params: {} } ]
]

正确的形状是：

[
  { params: {} },
  { params: {} },
  { params: {} }
]

刚试了一下就行了。

    export async function getStaticPaths() {
      const paths = data.comments.map((comment) => {
        return {
          params: {
            postId: comment.postId,
            commentId: comment.id
          }
        }
      });
    
      console.log(paths);
    
      return {
        paths,
        fallback: false
      }
    };

它生成3个urls：

• /posts/post-1/1
• /posts/post-1/2
• /posts/post-2/3

这就是你需要的吗？

Answer 2

就像提到@Aaron一样，问题在于双数组的过滤器y el映射。

 return {
    paths: [
        { params: { id: '1' } },
        { params: { id: '2' } }
      ],
      fallback: ...
}

https://nextjs.org/docs/basic-features/data-fetching#the-paths-key-required博士➡