Gatsby：TypeError：无法读取null的属性“map”

Question

我在我的Gatsby应用程序中得到了这个错误，该应用程序为作者提取places数据。当author.social的map（）点为null时，该错误将显示

TypeError：无法读取null的属性“map”

authors: ({ node: author }) => {
    return {
      ...author,
      social: author.social.map(s => ({ url: s })),
    };
  },

authors: ({ node: author }) => {
      return {
        ...author,
        social: author.social.map(s => {
          if (s === null) {
            return ({ url: 'https://www.mywebsite.com' });
          } else {
            return ({ url: s });
          }
        })
        ,
      };
    },

谢谢

Answer 1

这就是为什么我会这样做：

authors: ({ node: author }) => {
    // This to inspect what there is inside the variable 
    console.log(author);
    // And something like this to avoid the error:
    if(author.social && author.social.length > 0){
      // code here
    }
  });