Apollo：您正在终止链接上调用 concat，这将不起作用

Question

我在 Apollo、GraphQL 和 Nuxtjs 项目中工作，在设置 Apollo 配置时我收到了这个警告：

link.js:38 Error: You are calling concat on a terminating link, which will have no effect
at new LinkError (linkUtils.js:41)
at concat (link.js:38)
at ApolloLink.webpackJsonp../node_modules/apollo-link/lib/link.js.ApolloLink.concat (link.js:65)
at link.js:13
at Array.reduce (<anonymous>)
at from (link.js:13)
at createApolloClient (index.js:58)
at webpackJsonp../.nuxt/apollo-module.js.__webpack_exports__.a (apollo-module.js:66)
at _callee2$ (index.js:140)
at tryCatch (runtime.js:62)

这是我的代码：

link.js:38 Error: You are calling concat on a terminating link, which will have no effect
at new LinkError (linkUtils.js:41)
at concat (link.js:38)
at ApolloLink.webpackJsonp../node_modules/apollo-link/lib/link.js.ApolloLink.concat (link.js:65)
at link.js:13
at Array.reduce (<anonymous>)
at from (link.js:13)
at createApolloClient (index.js:58)
at webpackJsonp../.nuxt/apollo-module.js.__webpack_exports__.a (apollo-module.js:66)
at _callee2$ (index.js:140)
at tryCatch (runtime.js:62)

我在谷歌上搜索了任何类似的问题，我发现了这个https://github.com/Akryum/vue-cli-plugin-apollo/issues/47 但它没有帮助我。我试图改变：

const link = middlewareLink.concat(httpLink);

到：

const link = Apollo.from([middlewareLink, httpLink]);

但它仍然给我同样的警告，请任何帮助

Answer 1

我的解决方案是放在Http LinkApollo Link 数组的末尾（在创建 Apollo Client 时使用）。

...
const param = {
  link: ApolloLink.from([
    onError(...) =>...,
    authLink...,
    new HttpLink({
      uri: '/graphql',
      credentials: 'same-origin'
    })
  ]),
  cache: ...,
  connectToDevTools: ...
}

new ApolloClient(param);

我正在使用这些库：

• apollo-client
• apollo-cache-inmemory
• apollo-link
• apollo-link-http
• apollo-link-context
• apollo-link-error

Answer 2

就我而言，我解决了这个问题，更改了数组中的顺序，例如：

前：

const links = [...middlewares, localLink, authLink, httpLink, errorLink]

后：

const links = [...middlewares, localLink, authLink, errorLink, httpLink]

Answer 3

我注意到在 vue-apollo 自述文件中有一些关于 apolloClient 配置的文档，它说您可以关闭 defaultHttpLink 以使用终止链接。

return {
  link,
  cache: new InMemoryCache()
  defaultHttpLink: false, // this should do the trick
}