Loop JSON object and assign unique JSON item to a given variable

Question

I'm in the process of building a portfolio, one project I'd like to build is something similar to AirTasker,

I'm currently working on API built in node.js which takes in a JSON object, this JSON object is basically tasks that are being requested and need to be completed by the relevant person it is assigned to at present it's automatically assigned.

This is my test dummy data:

[
  {
      "clientId": 1,
      "requestId": "help move bed",
      "hours": 6
  },
  {
      "clientId": 2,
      "requestId": "pickup parcel",
      "hours": 1
  },
  {
      "clientId": 1,
      "requestId": "cut the grass",
      "hours": 4
  },
  {
      "clientId": 1,
      "requestId": "clean the kitchen",
      "hours": 2
  }
]

now my API is currently structured as follows:

var workers = [
  {"id": 1, "name": "Person 1", "tasks": []},
  {"id": 2, "name": "Person 2", "tasks": []},
  {"id": 3, "name": "Person 3", "tasks": []},
  {"id": 4, "name": "Person 4", "tasks": []},
  {"id": 5, "name": "Person 5", "tasks": []},
  {"id": 6, "name": "Person 6", "tasks": []},
]


 app.post('/api/v1/request', (req, res) => {

  var requestData = req.body;

  // Loop the tasks passed in
  requestData.forEach(request => {


    // Now evenly spread tasks across workers
    workers.forEach(p => {

        workers.tasks.push(request);

    })

      console.log(request);
  });

  res.status(200).send({
    success: 'true',
    message: 'Tasks has been assigned.',
    workers: workers
  })
});

the object workers as the people who will be doing the tasks, the issue I have is when I loop requestData I can't figure out the syntax to assign one task per one worker, at the moment how my code is it'll assign the one task to all workers and continue, the end result will be all workers have all the same tasks.

Can someone assist me with how I go about assigning one unique task per each worker

Joven28 · Accepted Answer · 2018-11-21 10:22:59Z

1

const workers = [
  {"id": 1, "name": "Person 1", "tasks": []},
  {"id": 2, "name": "Person 2", "tasks": []},
  {"id": 3, "name": "Person 3", "tasks": []},
  {"id": 4, "name": "Person 4", "tasks": []},
  {"id": 5, "name": "Person 5", "tasks": []},
  {"id": 6, "name": "Person 6", "tasks": []},
]

const dummies = [
  {
      "clientId": 1,
      "requestId": "help move bed",
      "hours": 6
  },
  {
      "clientId": 2,
      "requestId": "pickup parcel",
      "hours": 1
  },
  {
      "clientId": 1,
      "requestId": "cut the grass",
      "hours": 4
  },
  {
      "clientId": 1,
      "requestId": "clean the kitchen",
      "hours": 2
  }
];

workers.forEach(w => {
  w.tasks = dummies.filter(d => d.clientId === w.id);
});

console.log(workers);

Try this simple code.

answered Nov 21, 2018 at 10:22

Joven28

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1 Comment

Code Ratchet Over a year ago

works like a charm thank you. Can I restrict adding a new task to a worker when they have a maximum of 8 hours worth of tasks?

Bartłomiej Rasztabiga · Accepted Answer · 2018-11-21 10:23:54Z

1

You should add task to single worker object in foreach loop like this:

workers.forEach(butler => {
    butler.tasks.push(request);
})

answered Nov 21, 2018 at 10:23

Bartłomiej Rasztabiga

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Comments

Jack · Accepted Answer · 2018-11-21 11:57:10Z

1

You can use the modulus function to help.

var workers = [
      {"id": 1, "name": "Person 1", "tasks": []},
      {"id": 2, "name": "Person 2", "tasks": []},
      {"id": 3, "name": "Person 3", "tasks": []},
      {"id": 4, "name": "Person 4", "tasks": []},
      {"id": 5, "name": "Person 5", "tasks": []},
      {"id": 6, "name": "Person 6", "tasks": []},
    ]

    var tasks = [
    {
        name: 'a',
        hours: 8
    },
    {
        name: 'b',
        hours: 4
    },
    {
        name: 'c',
        hours: 2
    },{
        name: 'd',
        hours: 4
    },
    {
        name: 'e',
        hours: 3
    },
    {
        name: 'f',
        hours: 5
    },
    {
        name: 'g',
        hours: 4
    },
    {
        name: 'a',
        hours: 2
    },

]

    var reducer = (acc, val) => acc + val.hours;
    var length = workers.length;
    var start = 0;
    tasks.forEach(task => {
      if (workers[start%length].tasks.reduce(reducer, 0) < 8) {
        workers[start%length].tasks.push(task);
      }
      start += 1;
    });

    console.log(workers)

Here's a demo:

edited Nov 21, 2018 at 11:57

answered Nov 21, 2018 at 10:28

Jack

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2 Comments

Code Ratchet Over a year ago

Looks good Jack, much appreciated. Can I restrict adding a new task to a worker when they have a maximum of 8 hours worth of tasks?

Jack Over a year ago

I've updated the code to use a reducer to check. However be careful of an infinite loop occurring if you provide more tasks that your works can handle.

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