GraphQL请求错误 - 未知参数'slug'

Question

我试图将我的index.js页面链接到文章模板，以使用slug和createPages显示来自中间件Drupal站点的数据。我在index.js页面上正确显示数据，并且在将文件路径更改为createPages后，我的./src/templates/article.js似乎没有任何错误。

我在编译时遇到了这个GraphQL错误：

错误GraphQL错误编译站点的GraphQL查询时出错。错误：RelayParser：遇到1个错误： - 未知参数'slug'。来源：文件usersBrooksrelytHtdocsRepositoryGatsbyGraphqlGatsbySrcTemplatesArticleJs4119530598文件：GraphQL request

  GraphQL request (3:12)
  2:   query($slug: String!) {
  3:     umdHub(slug: { eq: $slug }) {
                ^
  4:       articles {

我的article.js代码：

import React from 'react'
import { graphql } from 'gatsby'
import { ListGroup, ListGroupItem } from 'reactstrap';

// eslint-disable-next-line
import Layout from "../components/layout"
import Header from "../components/header"
import Footer from "../components/footer"


export default ({ data }) => {
  return (
    <div>
      <Header />
      <div className="container spaces article">
        <div className="row">
          <section className="col-md-9">
            <div className="tag-list">
              <ul class="list-inline">
                <li class="list-inline-item"><a href="/">Highlighted</a></li>
                <li class="list-inline-item"><a href="/">Innovation</a></li>
                <li class="list-inline-item"><a href="/">Web Only</a></li>
                <li class="list-inline-item">February 28, 2019</li>
              </ul>
            </div>
            <h1>{data.title}</h1>
            {data.hero_image.map((hero, i) => (
              <div key={i}>
                <img className="img-fluid no-pad-top med-spaces" src={hero.url_1200_630} alt=" " />
              </div>
            ))}
            <div className="row article-content">
              <div className="col-md-10 offset-md-1">
                <h2 className="subheader">{data.subtitle}</h2>
                <div className="author"> 
                  <p>By <a href="/">Jane Doe</a> | Photos by <a href="/">ISTOCK</a></p>
                  <hr />
                </div>
                <div>
                  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
                  tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
                  quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
                  consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse
                  cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non
                  proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
                </div>
              </div>
            </div>
          </section>
          <aside className="col-md-3">
            <div>
              <ListGroup flush>
                <ListGroupItem disabled tag="a" href="#">Recent Posts</ListGroupItem>
                <ListGroupItem tag="a" href="#">Dapibus ac facilisis in</ListGroupItem>
                <span>February 27, 2019</span>
                <ListGroupItem tag="a" href="#">Morbi leo risus</ListGroupItem>
                <span>February 27, 2019</span>
                <ListGroupItem tag="a" href="#">Porta ac consectetur ac</ListGroupItem>
                <span>February 27, 2019</span>
                <ListGroupItem tag="a" href="#">Vestibulum at eros</ListGroupItem>
                <span>February 27, 2019</span>
              </ListGroup>
            </div>
          </aside>
        </div>
      </div>


      <Footer />
    </div>

  )
}


export const query = graphql`
  query($slug: String!) {
    umdHub(slug: { eq: $slug }) {
      articles {
        data {
          id
          title
          subtitle
          body
          summary
          hero_image {
            url_1200_630
          }
          authorship_date {
            formatted_short
            unix
            unix_int
            formatted_long
            formatted_short
            time
          }
          slug
        }
      }
    }
  }
`

我的gatsby-node.js：

const path = require(`path`)

exports.createPages = ({ graphql, actions }) => {
  const { createPage } = actions
  const articleTemplate = path.resolve(`./src/templates/article.js`)
  return graphql(`
    {
        umdHub {
          articles {
            data {
              id
              title
              subtitle
              body
              summary
              hero_image {
                url_1200_630
              }
              authorship_date {
                formatted_short
                unix
                unix_int
                formatted_long
                formatted_short
                time
              }
              slug
            }
          }
        }
      }
  `).then(result => {
    if (result.errors) {
      throw result.errors
    }

    result.data.umdHub.articles.data.forEach(data => {
      createPage({
        path: `${data.slug}`,
        component: articleTemplate,
        context: {

        },
      })
    })
  })
}

Answer 1

filter的快捷方式仅适用于直接节点的字段，即您可以通过umdHub过滤articles。所以当你用slug过滤时，它会在slug中查找字段umdHub，因为slug在umdHub.articles.data下而不存在。

这可能有所帮助：

export const query = graphql`
  query($slug: String!) {

-   umdHub(slug: { eq: $slug }) {
+   umdHub(articles: { data: { slug: { eq: $slug } } }) {

      articles {
        data {
          slug
        }
      }
    }
  }