如何使用Graphql从Strapi中在Gatsby中查询多个图像

问题描述

我在Strapi上的项目内容类型上设置了一个名为图片"的多媒体(图像)字段，并添加了2个项目，每个图片包含4张图像.我想使用Graphql在盖茨比中查询这些图像.

I have set up a multiple media(images) field called pictures on my project content type on Strapi and I have added 2 projects with pictures containing 4 images each.I want to query these images in Gatsby using Graphql.

这是我在gatsby-config.js中的插件数组

This is my plugins array in gatsby-config.js

    plugins: [
    `gatsby-plugin-react-helmet`,
    {
      resolve: `gatsby-source-filesystem`,
      options: {
        name: `images`,
        path: `${__dirname}/src/images`,
      },
    },
    `gatsby-plugin-sharp`,
    `gatsby-transformer-sharp`,
    {
      resolve: `gatsby-plugin-manifest`,
      options: {
        name: `gatsby-starter-default`,
        short_name: `starter`,
        start_url: `/`,
        background_color: `#663399`,
        theme_color: `#663399`,
        display: `minimal-ui`,
        icon: `src/images/gatsby-icon.png`,
      },
    },
    {
      resolve: `gatsby-source-strapi`,
      options: {
        apiURL: `http://localhost:1337`,
        queryLimit: 1000,
        contentTypes: [`project`],
      },
    }]

这是我在localhost:8000/___ graphql上的graphql查询

This is my graphql query on localhost:8000/___graphql

query MyQuery {
  allStrapiProject {
    nodes {
      pictures {
        formats {
          thumbnail {
            childImageSharp {
              fluid {
                src
              }
            }
          }
        }
      }
    }
  }
}

这是我得到的结果

   {
  "data": {
    "allStrapiProject": {
      "nodes": [
        {
          "pictures": [
            {
              "formats": {
                "thumbnail": null
              }
            },
            {
              "formats": {
                "thumbnail": {
                  "childImageSharp": {
                    "fluid": {
                      "src": "/static/eb8a7ee6108ecc0e6185aced82c3316b/b4216/167f320a448c2d6ff65acf179ee627e2.jpg"
                    }
                  }
                }
              }
            },
            {
              "formats": {
                "thumbnail": null
              }
            },
            {
              "formats": {
                "thumbnail": null
              }
            }
          ]
        },
        {
          "pictures": [
            {
              "formats": {
                "thumbnail": null
              }
            },
            {
              "formats": {
                "thumbnail": null
              }
            },
            {
              "formats": {
                "thumbnail": null
              }
            },
            {
              "formats": {
                "thumbnail": null
              }
            }
          ]
        }
      ]
    }
  }
}

除一个缩略图外，所有缩略图均包含null.

All of the thumbnails contain null except for one.

我尝试运行"gatsby clean"，有时即使我在Strapi上没有重复图像，有时也会使查询输出在多个位置具有相同的图像url.

I have tried running 'gatsby clean' and sometimes get the query output to have same image urls in multiple places even though i don't have repeating images on Strapi.

推荐答案

到目前为止，还没有官方"实现它的方法.但是有一种变通办法可以在构建过程中创建一个自定义节点.对于如下所示的graphql查询

As of now, there is no "official" way to make it happen. But there is a workaround which creates a custom node in the build process. For a graphql query like below

query MyQuery {
  allStrapiPortfolio {
    edges {
      node {
        category {
          images {
            localFile {
              childImageSharp {
                fluid {
                  base64
                  tracedSVG
                  srcWebp
                  srcSetWebp
                  originalImg
                  originalName
                }
              }
            }
          }
        }
      }
    }
  }
}

下面给出的代码在 images 之后创建 localFile 节点.该代码应放在 gatsby-node.js 中.

The code given below creates the localFile node after images. The code should go in gatsby-node.js.

const { createRemoteFileNode } = require(`gatsby-source-filesystem`);

exports.onCreateNode = async ({ node, actions, store, cache }) => {
  const { createNode, createNodeField } = actions;

  if (node.internal.type !== null && node.internal.type === "StrapiPortfolio") {
    for (const category of node.category) {
      for (const image of category.images) {
        console.log(image);
        const fileNode = await createRemoteFileNode({
          url: "http://localhost:1337" + image.url,
          store,
          cache,
          createNode,
          createNodeId: (id) => image.id.toString(),
        });

        if (fileNode) {
          image.localFile___NODE = fileNode.id;
        }
      }
    }
  }
};

请注意，您将必须根据需要自定义代码.在我的解决方案中，由于我的数据结构，我使用了两个for循环.如果不确定或只是想检查自定义代码是否有效，则可以在第一个if语句之前添加 console.log(node)和 console.log(image)在第二个for循环之后(在我的情况下).那应该给你一个关于你的数据结构以及应该采用哪种方式的指示.

Please note that you will have to customize the code depending on your needs. In my solution, I used two for loops because of my data structure. If you're unsure or just want to check if your custom code works, you can simply add a console.log(node) before the first if statement and a console.log(image) after the second for loop(in my case). That should give you an indication about your data structure and in which way you should proceed.

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