Updating state of deep object value in React/Redux using immutable.js - reactjs

Question

I have this pretty deeply nested state array and need to update the Hours field by Employee, Task, and Week. I've attempted numerous ways to do this with Immutable but not having success, any help?
Here is an example of my data :
[{
"Employee": "John Doe",
"Other Data": "test",
"Tasks": [{
"AccessType": "Confidential",
"DueDate": "2016-02-26 23:59:59",
"taskId": "3",
"TaskTitle": "testTitle",
"Weeks": {
"2016-10-10": {
"Hours": "3"
}
}
}]
}, {
"Employee": "Bill Der",
"Other Data": "test",
"Tasks": [{
"AccessType": "Confidential",
"DueDate": "2016-02-26 23:59:59",
"taskId": "3",
"TaskTitle": "testTitle",
"Weeks": {
"2016-10-10": {
"Hours": "3"
}
}
}]
}]

Answer 1

You are missing a bunch of information for me to fully answer this for you, but I can show you how I would do something like this otherwise.
You can take advantage of all the functions immutable js provides you with. So lets say you have an object with the information needed to mutate your immutable object, something like this :
var changeHours = {
"Employee": "John Doe",
"TaskTitle": "testTitle",
"Week": '2016-10-10',
"Hours": "5"
}
And we have a basic state like you have there set up like this :
var myState = Immutable.fromJS([{
"Employee": "John Doe",
"Tasks": [{
"AccessType": "Confidential",
"DueDate": "2016-02-26 23:59:59",
"taskId": "3",
"TaskTitle": "testTitle",
"Weeks": {
"2016-10-10": {
"Hours": "3"
}
}
}]
}]);
Note: I did not add more the the arrays, but we will map over them so they will be taken into account.
You can use immutables map to iterate over and find the items you are looking for, something like this :
var newstate = myState.map((k, v) => {
if (k.get('Employee') === changeHours.Employee) {
return k.get('Tasks').map((k, v) => {
if (k.get('TaskTitle') === changeHours.TaskTitle) {
return k.setIn(['Weeks', changeHours.Week, 'Hours'], changeHours.Hours);
}
return k;
})
return k;
}
return k;
});
To see it in action - http://fiddle.jshell.net/djj6u8xL/63/ . I am iterating over each array level with map and finding the correct node by checking based on our changeHours object and immutables get, then once I am at the right level I just use setIn. You can use updateIn as well, it just depends on your scenario.
In the future, please provide all the information for your question, not just a picture of the data, it will be much easier to help you :) (and not have to type out the data structure manually).
Edit: Update based on comment - http://fiddle.jshell.net/qxbq1nq3/9/
the code :
function newTasks(k) {
return k.get('Tasks').map((k, v) => {
if (k.get('TaskTitle') === changeHours.TaskTitle) {
return k.setIn(['Weeks', changeHours.Week, 'Hours'], changeHours.Hours);
}
return k;
});
}
var newstate = myState.map((k, v) => {
if (k.get('Employee') === changeHours.Employee) {
return k.set('Tasks', newTasks(k));
}
return k;
});