Javascript - Build a multi head tree with JSON list of children relationship

Yiffany
August 3, 2023
200 views
1 vote
2 Answers

I need somehelp to create a graph or tree structure from the raw json data from mongoDB, and the data points is parent children related. I tried to create some code to make a data structure and pretty print it, but it still have duplicated rows. Can any one fix my code so that no more duplicated?

Data points:

[
  {
    "_id": {
      "$oid": "577048a0a5f4970b59493861"
    },

    "children": [
      {
        "$oid": "5914d7528ed1755954d6e88f"
      },
      {
        "$oid": "56675f1446e0324b4566f6e9"
      },
      {
        "$oid": "5924f500381e3b5854db8a0c"
      },
      {
        "$oid": "5cc64fadcf995a1d6b54e745"
      },
      {
        "$oid": "5d71b5f49a311e6fd587e3dc"
      },
      {
        "$oid": "599646b5bd0b9864d8e7391d"
      },
      {
        "$oid": "5850ae570b242ff1782ea07c"
      },
      {
        "$oid": "58e9a01f33d3f1f208e032de"
      },
      {
        "$oid": "5546db39dbeafcef63e6efb6"
      },
      {
        "$oid": "5fbdad479a311e6fd58812ff"
      },
      {
        "$oid": "5cabd38142524178c66be1f1"
      },
      {
        "$oid": "5491ddb3d707d710141027c2"
      },
      {
        "$oid": "5d66f0109a311e6fd587e12c"
      },
      {
        "$oid": "56ef0296a7b280e91b475aeb"
      },
      {
        "$oid": "5cd4dabce84cdd76faaf597f"
      },
      {
        "$oid": "58e43b26f79ce47642fae5c4"
      },
      {
        "$oid": "58252929332df05c01c1624f"
      },
      {
        "$oid": "55dfd7d2bb58034a69d563fe"
      },
      {
        "$oid": "56ef03976e418ae84779d827"
      },
      {
        "$oid": "5491dd8bd707d710141027c1"
      },
      {
        "$oid": "5ba2eb071e910a58acf98e3f"
      },
      {
        "$oid": "5cf580fb87823d36e74808bf"
      },
      {
        "$oid": "5dae373a3c6e806fd3bbb1fc"
      },
      {
        "$oid": "61c3a8bf3824dd48d99ab572"
      },
      {
        "$oid": "5a2f468069d12b0a0f4cc68e"
      },
      {
        "$oid": "5be8de44c052dc326ab1e810"
      },
      {
        "$oid": "5c98455267dcef531cbc44f6"
      }
    ],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "5835f65457eea2852d2bf48c"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "5924f500381e3b5854db8a0c"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "56ef03976e418ae84779d827"
    },

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

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "55aef43d03d4ad2343c2e27f"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "56d382a0589377c94614cbbc"
    },

    "children": [
      {
        "$oid": "5cdb32901d30d576fe946d44"
      },
      {
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      },
      {
        "$oid": "613e86c24faf093afab2c0ea"
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      {
        "$oid": "62eb0a4456bdf04c7768843c"
      },
      {
        "$oid": "5a53ddb8159e7944e0b44795"
      },
      {
        "$oid": "606e58ad2f2af36f2219bcc8"
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      {
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      }
    ],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "592776bc8ed1755954d6e8d5"
    },

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

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "59503126381e3b5854db8afc"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "58e43b26f79ce47642fae5c4"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "59644a45442b1e826dd7cdac"
    },

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

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "599646b5bd0b9864d8e7391d"
    },

    "children": [],
    "kind": "Organisation"
  },
  {
    "_id": {
      "$oid": "59965edbf39ca264d9dd41ca"
    },

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

    "children": [],
    "kind": "Organisation"
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    "children": [
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    "kind": "Organisation"
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    "children": [],
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    "_id": {
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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"
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  {
    "_id": {
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    "children": [],
    "kind": "Organisation"
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    "_id": {
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    "kind": "Organisation"
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      },
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      {
        "$oid": "61c3a8bf3824dd48d99ab572"
      }
    ],
    "kind": "Organisation"
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    "_id": {
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    "children": [
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    "children": [],
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    "children": [],
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    "children": [],
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    "children": [],
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    "children": [],
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    "children": [
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    "children": [],
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    "children": [],
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    "children": [],
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    "children": [],
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    "children": [],
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    "_id": {
      "$oid": "61c3a8bf3824dd48d99ab572"
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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"
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    "_id": {
      "$oid": "61c3bb467d28ec48d8455714"
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    "children": [
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      }
    ],
    "kind": "Organisation"
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  {
    "_id": {
      "$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"
  }
]

Need to write a script with any language to build a tree from this data, but need to make sure there is no duplicated. But my current code wont work this way:

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);

You can see the duplicated rows, i dont want those duplicated! logically there won’t have any duplicated.

Answers

You can try with this python code:

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)

You need to build structure and later filter out all nodes that are mark as child.
Then you can pretty print

- trincot
- August 3, 2023 at 11:41 am
- 0 votes
0
The problem is that your forest will get a node for each item in data. You should only have top-level entries in the forest array. To know which they are, you first have to check which nodes have no parent. This you can do while building the nested object structure.

So adapt your createTree function, so it only takes the data as argument, and it returns the array of root nodes.

I would also avoid having to scan the data with find each time you need to look up an id. Use a hashmap for that (could be a plain object in JavaScript).

Like this:
```
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];
}
```
Call like this:
```
const forest = createTree(data);
prettyPrint(forest);
```
(No change is needed in prettyPrint).
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Javascript – Build a multi head tree with JSON list of children relationship

Answers