如何在 JS 中合并一个 object 两个 json 对象，其中 object 的 ID 对应于第二个 object 的相同 ID

Question

My question relates to the fact I'm querying 2 different objects from DB and the result is in JSON. I need to merge them into one.

The 2 objects have in common this two key/value IRBId =... and id =... and they look as an example

OBJ 1

{
   "data":{
      "IRBs":{
         "nodes":[
            {
               "id":"8",
               "name":"Admin ",
            },
            {
               "id":"9",
               "name":"Again",
            }
         ],
      }
   }
}

OBJ 2

{
   "data":{
      "informedConsentForms":{
         "count":3,
         "nodes":[
            {
               "id":"93",
                ...
               "IRBId":"9",
            },
            {
               "id":"92",
               ...
               "IRBId":"8",
            },
            {
               "id":"91",
               ...
               "IRBId":"8",
            }
         ],
      }
   },

As you will see above OBJ 2 and OBJ 1 corresponding with the same at IRBid and id.

What I need is to merge the two OBJ where IRBId OBJ 2 === id OBJ 1

The result I would expect after the merge is

OBJ merged

 {
            [{
               "id":"93",
                ...
               "IRBId":"9",
               "irb": {
                 "name":"Again ",
                 ...
               }
            },
            {
               "id":"92",
               ...
               "IRBId":"8",
               "irb": {
                 "name":"Admin ",
                 ...
               }
            },
            {
               "id":"91",
               ...
               "IRBId":"8",
               "irb": {
                 "name":"Admin ",
                 ...
            }
         ],
   },

I don't know how to make it looks like this.

Answer 1

You need to use the map function on the nodes in the first object to construct a new object that contains the second and first object's attributes.

 const obj1 = { "data": { "IRBs": { "nodes": [{ "id": "8", "obj1": "one", "name": "Admin ", }, { "id": "9", "obj1": "two", "name": "Again", } ] } } }; const obj2 = { "data": { "informedConsentForms": { "count": 3, "nodes": [{ "id": "93", "obj2": "1", "IRBId": "9", }, { "id": "92", "obj2": "2", "IRBId": "8", }, { "id": "91", "obj2": "3", "IRBId": "8", } ], } } }; const obj1Data = obj1.data.IRBs.nodes; const obj2Data = obj2.data.informedConsentForms.nodes; const res = obj2Data.map(item => { const obj1Item = obj1Data.find(obj1Item => item.IRBId === obj1Item.id); return obj1Item? {...item, "irb": {...obj1Item}}: {...item}; }); console.log(res);

Answer 2

Try using Array.reduce Logic

• Loop through second object data nodes
• Find the matching nodes from object 1 data nodes.
• Push to accumulator with required details. (I have added only the nodes that was mentioned in in Expected resut, you can add asmuch as you need.)

 const obj1 = { "data": { "IRBs": { "nodes": [ { "id": "8", "name": "Admin ", }, { "id": "9", "name": "Again", } ], } } } const obj2 = { "data": { "informedConsentForms": { "count": 3, "nodes": [ { "id": "93", "IRBId": "9", }, { "id": "92", "IRBId": "8", }, { "id": "91", "IRBId": "8", } ], } }, }; const obj1List = obj1.data.IRBs.nodes; const output = obj2.data.informedConsentForms.nodes.reduce((acc, curr) => { const matchingNode = obj1List.find((item) => item.id === curr.IRBId); if (matchingNode) { acc.push({ id: curr.id, IRBId: curr.IRBId, irb: { name: matchingNode.name } }) } return acc; }, []); console.log(output);

Answer 3

i am using nested loop, try this one

 const obj2 = { "data":{ "informedConsentForms":{ "count":3, "nodes":[ { "id":"93", "IRBId":"9", }, { "id":"92", "IRBId":"8", }, { "id":"91", "IRBId":"8", } ], } }, } const obj1 = { "data":{ "IRBs":{ "nodes":[ { "id":"8", "name":"Admin ", }, { "id":"9", "name":"Again", } ], } } } const result = []; const obj2Nodes = obj2.data.informedConsentForms.nodes; for(let i = 0; i < obj2Nodes.length; i++) { const obj1Nodes = obj1.data.IRBs.nodes for(let j = 0; j < obj1Nodes.length; j++) { if(obj2Nodes[i].IRBId === obj1Nodes[j].id) { const {id, ...reObj1Nodes} = obj1Nodes[j]; result.push({...obj2Nodes[i], 'irb': {...reObj1Nodes } }) } } } console.log(result)