How to push object array in array

Question

loggedUser as object in users index (unknown) variable:

// This is the users index of a variable containing multiple users which have a `docs` array.
users: [
    {id: '140255045', password: '72465091Be', email: '[email protected]', tc: '1', dId: 1, name: 'Erkan', surname: 'Çalışkan', docs: []},
    {id: '1', password: '1', email: '[email protected]', tc: '1', dId: 1, name: 'Erkan', surname: 'Çalışkan', docs: []},
    {id: '2', password: '2', email: '[email protected]', tc: '1', dId: 2, name: 'Erkan', surname: 'Çalışkan', docs: []},
    {id: '3', password: '3', email: '[email protected]', tc: '1', dId: 2, name: 'Erkan', surname: 'Çalışkan', docs: []}
]

This is the array I want to push into object:

var docs = [
    {
        type: '',
        piece: '',
        insti: '',
        desc: '',
        selected: '',
        date: ''
    }
];

var a = this.docs.push({
    type: this.docs.type,
    piece: this.docs.piece,
    insti: this.docs.insti,
    desc: this.docs.desc,
    selected: this.docs.selected,
    date: today
});

this.loggedUser.docs.push(a);

console.log(this.loggedUser);

Error : Cannot read property 'push' of undefined

I want to push docs array to loggedUser.docs array.

This seems syntactically incorrect, but it's hard to tell if it's just pieces of code stripped out from elswhere. It looks like you're half way through defining an object with properties of users and docs, but then you suddenly have function code without terminating the object definition? I would perhaps expect a comma after the docs definition and then maybe a function definition for the last bit? Otherwise what is the 'this' referring to? — Darren Crabb
– Darren Crabb, Commented Oct 19, 2018 at 15:37
BTW - The error basically means that it doesn't know what this.docs is - it is undefined. The push part is irrelevant here until you sort that undefined bit out. — Darren Crabb
– Darren Crabb, Commented Oct 19, 2018 at 15:46

Pim · Accepted Answer · 2018-10-19 15:35:24Z

2

Change the colon (:) to an equals sign (=) The colon is used for assigning stuff to an id within an object or array.

users = [
    {id:'140255045',password:'72465091Be',email:'[email protected]',tc:'1',dId:1,name:'Erkan',surname:'Çalışkan',docs:[]},
    {id:'1',password:'1',email:'[email protected]',tc:'1',dId:1,name:'Erkan',surname:'Çalışkan',docs:[]},
    {id:'2',password:'2',email:'[email protected]',tc:'1',dId:2,name:'Erkan',surname:'Çalışkan',docs:[]},
    {id:'3',password:'3',email:'[email protected]',tc:'1',dId:2,name:'Erkan',surname:'Çalışkan',docs:[]}
  ]

answered Oct 19, 2018 at 15:35

Pim

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1 Comment

Boussadjra Brahim Over a year ago

i think users is data object property not a local variable

James · Accepted Answer · 2018-10-19 15:57:40Z

If users is an index of a variable, your code should look like this:

// Schema for `this.loggeduser`
{
    id: '140255045',
    password: '72465091Be',
    email: '[email protected]',
    tc: '1',
    dId:1,
    name: 'Erkan',
    surname: 'Çalışkan',
    docs:[]
}

// Declare docs as an `Array` object variable in `this` context.
this.docs = [
    {
        type: '',
        piece: '',
        insti: '',
        desc: '',
        selected: '',
        date: ''
    }
];

// Push an object into the declared array.
// By now `this.docs` should contain 2 objects.
this.docs.push({
    type: this.docs.type,
    piece: this.docs.piece,
    insti: this.docs.insti,
    desc: this.docs.desc,
    selected: this.docs.selected,
    date: today
});

// Push `this.docs` `Array` object.
// If `this.loggedUser` exists and has `docs` property of type `Array` this should work.
this.loggedUser.docs.push(this.docs);

console.log(this.loggedUser)

Darren Crabb · Accepted Answer · 2018-10-19 16:08:28Z

If you want to keep users and docs within an object you can do it this way (I've simplified the end code with basic strings to show that it works). I've created another variable called obj to store you're object somewhere.

var obj = {
	users : [
			{id:'140255045',password:'72465091Be',email:'[email protected]',tc:'1',dId:1,name:'Erkan',surname:'Çalışkan',docs:[]},
			{id:'1',password:'1',email:'[email protected]',tc:'1',dId:1,name:'Erkan',surname:'Çalışkan',docs:[]},
			{id:'2',password:'2',email:'[email protected]',tc:'1',dId:2,name:'Erkan',surname:'Çalışkan',docs:[]},
			{id:'3',password:'3',email:'[email protected]',tc:'1',dId:2,name:'Erkan',surname:'Çalışkan',docs:[]}
		  ],
	
	docs:	[{	type : '',
				piece : '',
				insti : '',
				desc : '',
				selected : '',
				date : ''}]	
}
	

obj.docs.push({	type : 'test',
				piece : 'test',
				insti : 'test',
				desc : 'test',
				selected : 'test',
				date : 'test'});
 
		
console.log(obj.docs);

You could also do this with a function within the same object like this

var obj = {
	users : [
			{id:'140255045',password:'72465091Be',email:'[email protected]',tc:'1',dId:1,name:'Erkan',surname:'Çalışkan',docs:[]},
			{id:'1',password:'1',email:'[email protected]',tc:'1',dId:1,name:'Erkan',surname:'Çalışkan',docs:[]},
			{id:'2',password:'2',email:'[email protected]',tc:'1',dId:2,name:'Erkan',surname:'Çalışkan',docs:[]},
			{id:'3',password:'3',email:'[email protected]',tc:'1',dId:2,name:'Erkan',surname:'Çalışkan',docs:[]}
		  ],
	
	docs:	[{	type : '',
				piece : '',
				insti : '',
				desc : '',
				selected : '',
				date : ''}],
	
	a: function () {
		this.docs.push({	type : 'test',
				piece : 'test',
				insti : 'test',
				desc : 'test',
				selected : this.docs[0].selected,
				date : this.docs[0].selected});
		
	}
}
	

obj.a();
 
		
console.log(obj.docs);

Remember that when referencing the this.docs that it is returning an array so you'll need to make sure you put in index in there for it to refer to a particular object within that array (as I've done in this code on the last couple of values).

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