如何在 Angular 中删除 JSON 对象内的对象？

Question

My question goes like this. I have a JSON object below. I want to remove the object that has an assignment 1. I already looped through it and by the best of me I cannot seem to remove that particular object.

0: Object
  teller_id: 1
  details: CASH
  assignments: Array [2]
   0: Object  <---- Remove this Object and all the elements indside it
      service_id: 1
      status: 1
      assignment: 1
   1: Object
      service_id: 1
      status: 1
      assignment: 2
1: Object
 teller_id: 2
 details: EMP
 assignments: Array [2]
   0: Object
      service_id: 2
      status: 3
      assignment: 4
   1: Object
      service_id: 2
      status: 4
      assignment: 6

Remove object with an assignment of 1

0: Object
  teller_id: 1
  details: CASH
  assignments: Array [2]
   1: Object
      service_id: 1
      status: 1
      assignment: 2
1: Object
 teller_id: 2
 details: EMP
 assignments: Array [2]
   0: Object
      service_id: 2
      status: 3
      assignment: 4
   1: Object
      service_id: 2
      status: 4
      assignment: 6

In which it removes the Object[0] found inside the assignments array. Thanks

Answer 1

None of this really needs Angular, because it involves pure JavaScript.

In each object, assignments is an array. Whilst an array is a form of object, it has its own properties. There are a few ways to approach this.

Firstly if you wish to treat it as an array, then:

myObject[0].assignments.splice(0,1); // remove first element from array

or:

myObject[0].assignments.shift(); // get first element from array

This will however move the indexes of the assignments down in the array. ie assignments[1] will become assignments[0].

If you don't want to change the indices, then delete is what you're looking for:

delete myObject[0].assignments[0];

This will however cause the first element of the array to have the value undefined .

Answer 2

Let the variable name that points to the object is ar :

delete ar[0].assignments[0];

I hope you don't have trouble looping and finding the element.

Answer 3

You can use splice function for delete elements from array

var arr = [{name: 'Ram', assiignment: 1}, {name: 'Raju', assiignment: 2}];
arr.splice(0,1); // Here 0 is the index of element to be delete and 1 is how many elements to delete from that index we provided

After your array will like this:

[{name: 'Raju', assiignment: 2}]

Answer 4

you can do something like

angular.forEach(items, function (item) {
    for(var i = item.assignments.length - 1; i >=0; i--) {
        if (item.assignments[i].assignment === 1) {
            item.assignments.splice(i, 1);
        }
    } 
});

This is problematic with angular native.

If you are using some third party library like lodash or underscore, it will be easier.