Question

让我们说我想在盖茨比的博客上的一篇文章中加入50张图片。使用GraphQL获取图像。我最终为50个图像中的每个图像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）的原则。我试图摆弄碎片，但我是一个菜鸟用户，我只能弄清楚如何重复使用这些重复的代码并只写一次，而不是50次？

我能做些什么来改善这个？

理想情况下，我喜欢拥有一个代码，我可以在其中编写一次重复部分，然后将其重复用于我所提取的每个图像。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。有关更多信息，请参见this github issue。

当我遇到与您相似的问题时，请通过一次查询选择所有需要的图像，然后在视图中进行处理。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组件中的任何图像。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>
  )
}

如何在Gatsby中使用GraphQL获取许多图像时保持DRY

1 个答案: