在 Gatsby 中使用 GraphQL 获取许多图像时如何保持 DRY

Question

假设我想在一篇关于 Gatsby 的博客文章中包含 50 张图片。使用 GraphQL 获取图像。我最终为 50 张图片中的每一张都编写了非常重复的查询，如下所示：

export const query = graphql`
  query ArticleImageQuery {
    coverImage: imageSharp(id: {regex: "/cover-image/" }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
    artisan1: imageSharp(id: {regex: "/artisan1/" }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
    artisan2: imageSharp(id: {regex: "/artisan2/" }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
    artisan3: imageSharp(id: {regex: "/artisan3/" }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
    johannystrom1: imageSharp(id: {regex: "/johan-nystrom1/" }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
    johannystrom2: imageSharp(id: {regex: "/johan-nystrom2/" }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
    johannystrom3: imageSharp(id: {regex: "/johan-nystrom3/" }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
    johannystrom4: imageSharp(id: {regex: "/johan-nystrom4/" }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
    fratello1: imageSharp(id: {regex: "/fratello/" }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
    booksAntiques1: imageSharp(id: {regex: "/books-antiques1/" }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
    booksAntiques2: imageSharp(id: {regex: "/books-antiques2/" }) {
      sizes(maxWidth: 700, maxHeight: 525, cropFocus: CENTER) {
        ...GatsbyImageSharpSizes
      }
    },
    pastor1: imageSharp(id: {regex: "/pastor1/" }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
    pastor2: imageSharp(id: {regex: "/pastor2/" }) {
      sizes(maxWidth: 700, maxHeight: 525, cropFocus: CENTER) {
        ...GatsbyImageSharpSizes
      }
    },
    pastor3: imageSharp(id: {regex: "/pastor3/" }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
    libertyOrDeath1: imageSharp(id: {regex: "/liberty-death1/" }) {
      sizes(maxWidth: 700, maxHeight: 525, cropFocus: CENTER) {
        ...GatsbyImageSharpSizes
      }
    },
    libertyOrDeath2: imageSharp(id: {regex: "/liberty-death2/" }) {
      sizes(maxWidth: 700, maxHeight: 525, cropFocus: CENTER) {
        ...GatsbyImageSharpSizes
      }
    },
    kaisla1: imageSharp(id: {regex: "/kaisla1/" }) {
      sizes(maxWidth: 700, maxHeight: 525, cropFocus: CENTER) {
        ...GatsbyImageSharpSizes
      }
    },
    blockDylan1: imageSharp(id: {regex: "/block-dylan1/" }) {
      sizes(maxWidth: 700, maxHeight: 525, cropFocus: CENTER) {
        ...GatsbyImageSharpSizes
      }
    },
    blockDylan2: imageSharp(id: {regex: "/block-dylan2/" }) {
      sizes(maxWidth: 700, maxHeight: 525, cropFocus: CENTER) {
        ...GatsbyImageSharpSizes
      }
    },
    blockDylan3: imageSharp(id: {regex: "/block-dylan3/" }) {
      sizes(maxWidth: 700, maxHeight: 525, cropFocus: CENTER) {
        ...GatsbyImageSharpSizes
      }
    },
    blockDylan4: imageSharp(id: {regex: "/block-dylan4/" }) {
      sizes(maxWidth: 700, maxHeight: 525, cropFocus: CENTER) {
        ...GatsbyImageSharpSizes
      }
    },
    blockDylan5: imageSharp(id: {regex: "/block-dylan5/" }) {
      sizes(maxWidth: 700, maxHeight: 525, cropFocus: CENTER) {
        ...GatsbyImageSharpSizes
      }
    },

    /* The list goes on, you get the idea... */
  }
`;

这严重违反了 DRY（不要重复自己）原则。我试图摆弄片段，但我是一个 GraphQL 菜鸟用户，我只是不知道如何重用这个重复的代码并只写一次，而不是 50 次？

我可以做些什么来改善这一点？

理想情况下，我希望有一个代码，我可以在其中编写一次重复部分，然后将其重复用于我获取的每个图像。例如：

/* NOTE: FICTIONAL PSEUDOCODE */

const imageQuery = graphql`
  query ImageQuery($path: String!) {
    imageSharp(id: {regex: $path }) {
      sizes(maxWidth: 700, maxHeight: 525) {
        ...GatsbyImageSharpSizes
      }
    },
  }
`;

export const query = graphql`
  query ArticleImageQuery {
    coverImage: ImageQuery("/cover-image/"),
    artisan1: ImageQuery("/artisan1/"),
    artisan2: ImageQuery("/artisan2/"),
    artisan3: ImageQuery("/artisan3/"),
    johannystrom1: ImageQuery("/johan-nystrom1/"),'
    /* ... AND SO ON */
  }
`;

Answer 1

GraphQL 片段没有参数。请参阅this github issue 了解更多信息。

当我遇到与您类似的问题时，我会通过一次查询选择我需要的所有图像，然后在视图中处理它们。例如这样的查询：

export const query = graphql`
{
  allFile(filter: {absolutePath: {regex: "/img/o-meni/im/"}}) {
    edges {
      node {
        id
        name
        publicURL
        childImageSharp {
          sizes(maxWidth: 700, maxHeight: 525) {
              ...GatsbyImageSharpSizes
          }
        }
      }
    }
  }
}
`

然后您可以过滤特定图像，例如 artisan1 或 React 组件中的任何一个。要显示它们，您可以使用如下代码：

{
  this.props.data.allFile.edges.map(({ node }) =>
    <a href={node.publicURL} key={node.id}>
      <Img sizes={node.childImageSharp.sizes} alt={node.name} title={node.name} />
    </a>
  )
}