使用 JSON 子关系列表构建多头树

问题描述 投票：0回答：2

我需要一些帮助来从 mongoDB 的原始 json 数据创建图形或树结构，并且数据点与父子相关。我尝试创建一些代码来制作数据结构并漂亮地打印它，但它仍然有重复的行。任何人都可以修复我的代码，以便不再重复吗？

数据点：

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      {
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      {
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    "kind": "Organisation"
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    "_id": {
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    },

    "children": [
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    "kind": "Organisation"
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    "children": [],
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    "children": [],
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    "children": [],
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  {
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    "children": [
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    "kind": "Organisation"
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    "_id": {
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    "children": [],
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  {
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    "children": [],
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    "children": [],
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    "children": [],
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    "children": [],
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    "children": [],
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    "children": [],
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  {
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    },

    "children": [],
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  {
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    },

    "children": [
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      {
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      },
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      },
      {
        "$oid": "5491dfa5d707d710141027cb"
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    ],
    "kind": "Organisation"
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    "children": [
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    "kind": "Organisation"
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    "children": [],
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    "children": [],
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    "children": [],
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  {
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    "children": [],
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    "children": [],
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    "children": [],
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    "children": [],
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    "_id": {
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    "children": [],
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    "children": [],
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  {
    "_id": {
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    "children": [],
    "kind": "Organisation"
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  {
    "_id": {
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    "children": [
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    ],
    "kind": "Organisation"
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    "children": [
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      }
    ],
    "kind": "Organisation"
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  {
    "_id": {
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    "children": [
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      }
    ],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "61c3bb467d28ec48d8455714"
    },

    "children": [
      {
        "$oid": "5965a855b3e775836dfd8d5b"
      }
    ],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "6241210f7210ae3af7727813"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "6289c9d0adb2f54c79e239d4"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "628da1ce238868408a576c22"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "6298322c238868408a576cc5"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "62eb0a4456bdf04c7768843c"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "639643faf06d0004d42b2457"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "63a23108a4243f051c006f77"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "64090ff9903a4604d5e69032"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "64518b0da4243f051c007932"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "64924d566d951e05091e295d"
    },

    "children": [],
    "kind": "Organisation"
  }
]

需要用任何语言编写脚本来根据这些数据构建树，但需要确保没有重复。但我当前的代码不会这样工作：

const data = require("./dat.json");

function createTree(data, rootId) {
  const root = data.find((item) => item._id.$oid === rootId);
  if (!root) return null;

  const children = root.children.map((child) => createTree(data, child.$oid));

  return {
    ...root,
    children,
  };
}

function prettyPrint(nodes, level = 0) {
  nodes.forEach((node) => {
    console.log(`${"  ".repeat(level)} (${node.kind}) ${node._id.$oid}`);
    prettyPrint(node.children, level + 2);
  });
}

const forest = data.map((item) => createTree(data, item._id.$oid));

prettyPrint(forest);

您可以看到重复的行，我不希望这些重复！从逻辑上讲，不会有任何重复。我尝试删除所有重复的 id，然后将有 129 个不同的值。

------更新-------- 既然我们已经知道所有的都是唯一的，我们可以做一些事情来检查这些重复项并只保留最深层并删除其他层吗？

javascript python data-structures graph tree
2个回答
1
投票

你可以尝试使用这个Python代码：

import json

with open('dat.json') as f:
    data = json.load(f)

id_to_node = {node['_id']['$oid']: node for node in data}

all_ids = set(id_to_node.keys())

children_ids = set()

for node in data:
    for i, child in enumerate(node.get("children", [])):
        child_id = child['$oid']
        if child_id in id_to_node:  # If child node exists
            node['children'][i] = id_to_node[child_id]
            children_ids.add(child_id)

root_ids = all_ids - children_ids

new_data = [id_to_node[root_id] for root_id in root_ids]

def pprint(node, ind=0):
    ind_str = " "*4*ind
    print(f"{ind_str}({node.get('kind', '')}) {node['_id']['$oid']}: ")
    for child in node.get("children", []):
        pprint(child, ind+1)


for node in new_data:
    pprint(node)

您需要构建结构，然后过滤掉所有标记为子节点的节点。
然后你就可以漂亮地打印了

1
投票

问题是您的 

forest
将获得 data 中的 
each
项的节点。 
forest
数组中应该只有顶级条目。要知道它们是什么，您首先必须检查哪些节点没有父节点。您可以在构建嵌套对象结构时执行此操作。

因此，调整您的 

createTree
函数，使其仅将 
data
作为参数，并返回根节点数组。

我还可以避免每次需要查找 id 时都用 

find
扫描数据。为此使用哈希图（可以是 JavaScript 中的普通对象）。

像这样：

function createTree(data) {
    const nodes = Object.fromEntries(data.map(item  => 
        [item._id.$oid, { ...item, children: [] }]
    ));
    const roots = new Set(Object.values(nodes));
    for (const {_id, children} of data) {
        nodes[_id.$oid].children.push(...children.map(({$oid}) => {
            roots.delete(nodes[$oid]);
            return nodes[$oid];
        }));
    }
    return [...roots];
}

这样称呼：

const forest = createTree(data);
prettyPrint(forest);

（

prettyPrint
无需更改）。

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