如何将多个游标传递给具有多个节点ids的单个GitHub GraphQL查询？

Question

我正在尝试批处理GraphQL查询，以便从具有相同请求的多个存储库中检索所需的数据，其中每个存储库都有不同的游标。

假设我有3个节点的I，并且只有2个游标，映射如下：

NODE_ID_1 <-> CURSOR_X
NODE_ID_2 <-> Empty
Node_ID_3 <-> CURSOR_Y

如何填充GraphQL查询，以便可以查询所有3个节点，但传递它们各自的游标？

query {
  nodes(ids: ["NODE_ID_1", "NODE_ID_2", "NODE_ID_3"]) {
    ... on Repository {
      databaseId
      stargazers(first: 100, after:???) {
        pageInfo {
          endCursor
        }
        edges {
          starredAt
        }
      }
    }
  }
}

Answer 1

您可以通过迭代节点来使用aliases，并将它们映射到像nodeX这样的字段名：

{
  node1: node(id: "MDEwOlJlcG9zaXRvcnkxMDQ4MzQ4") {
    ... on Repository {
      ...Repo
    }
  }
  node2: node(id: "MDEwOlJlcG9zaXRvcnkyMzE5NDk4") {
    ... on Repository {
      ...Repo
    }
  }
  node3: node(id: "MDEwOlJlcG9zaXRvcnkyMzI1Mjk4") {
    ... on Repository {
      ...Repo
    }
  }
}

fragment Repo on Repository {
  name
}

输出：

{
  "data": {
    "node1": {
      "name": "DROP5.0"
    },
    "node2": {
      "name": "subsurface"
    },
    "node3": {
      "name": "linux"
    }
  }
}

对于游标值，您只需要将字段名称映射到节点id和游标值：

{
  node1: node(id: "MDEwOlJlcG9zaXRvcnkyMzE5NDk4") {
    ... on Repository {
      name
      stargazers(first: 1, after:"Y3Vyc29yOnYyOpIAzR1p") {
        pageInfo {
          endCursor
        }
        edges {
          starredAt
        }
      }
    }
  }
  node2: node(id: "MDEwOlJlcG9zaXRvcnkxMDQ4MzQ4") {
    ... on Repository {
      name
      stargazers(first: 1, after: null) {
        pageInfo {
          endCursor
        }
        edges {
          starredAt
        }
      }
    }
  }
  node3: node(id: "MDEwOlJlcG9zaXRvcnkyMzI1Mjk4") {
    ... on Repository {
      name
      stargazers(first: 1, after:"Y3Vyc29yOnYyOpIAzQzi") {
        pageInfo {
          endCursor
        }
        edges {
          starredAt
        }
      }
    }
  }
}

在这种情况下，输入映射将如下所示：

input = {
    "node1": {
        "id": "MDEwOlJlcG9zaXRvcnkyMzE5NDk4",
        "cursor": "Y3Vyc29yOnYyOpIAzR1p"
    },
    "node2": {
        "id": "MDEwOlJlcG9zaXRvcnkxMDQ4MzQ4",
        "cursor": null
    },
    "node3": {
        "id": "MDEwOlJlcG9zaXRvcnkyMzI1Mjk4",
        "cursor": "Y3Vyc29yOnYyOpIAzQzi"
    }
}

使用变量：

query ($id1: ID!, $cursor1: String, $id2: ID!, $cursor2: String, $id3: ID!, $cursor3: String) {
  node1: node(id: $id1) {
    ... on Repository {
      name
      stargazers(first: 1, after: $cursor1) {
        pageInfo {
          endCursor
        }
        edges {
          starredAt
        }
      }
    }
  }
  node2: node(id: $id2) {
    ... on Repository {
      name
      stargazers(first: 1, after: $cursor2) {
        pageInfo {
          endCursor
        }
        edges {
          starredAt
        }
      }
    }
  }
  node3: node(id: $id3) {
    ... on Repository {
      name
      stargazers(first: 1, after: $cursor3) {
        pageInfo {
          endCursor
        }
        edges {
          starredAt
        }
      }
    }
  }
}

变量：

{
  "id1": "MDEwOlJlcG9zaXRvcnkyMzE5NDk4",
  "cursor1": "Y3Vyc29yOnYyOpIAzR1p",
  "id2": "MDEwOlJlcG9zaXRvcnkxMDQ4MzQ4",
  "cursor2": null,
  "id3": "MDEwOlJlcG9zaXRvcnkyMzI1Mjk4",
  "cursor3": "Y3Vyc29yOnYyOpIAzQzi"
}