Why would Angular push index 0 array into a sub array and not index 1?

Question

I have the following Array setup in my oninit:

 this.tests = [{
      status: 0,
      testresults: [{       
        name: 'test',
          id: 1
      }]
    }
    ]
    ;

    this.tests.push([{
      status: 1,
      testresults: [{       
        name: 'test2',
          id: 2
      }]
    }
    ]
    }]);

This array works as expected. My goal is to push a queries results into the testresults array that is inside tests.

  this.tests[0].testresults.push(this.qryresults);
  this.tests[1].testresults.push(this.qryresults);

Index 0 works correctly, Index 1 gives back the following error:

"ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'push' of undefined
TypeError: Cannot read property 'push' of undefined"

etarhan · Accepted Answer · 2021-02-26 21:05:27Z

3

You are pushing an array the second time around instead of an extra object, which results an error because the array you've pushed does not have the property testresults. Please refer to the code snippet below for a working revision of the code:

(function() {
  this.qryresults = "some test data"
  this.tests = [{
    status: 0,
    testresults: [{
      name: 'test',
      id: 1
    }]
  }];

  this.tests.push({ // <--- removed [ here
    status: 1,
    testresults: [{
      name: 'test2',
      id: 2
    }]
  });              // <--- removed ] here

  this.tests[0].testresults.push(this.qryresults);
  this.tests[1].testresults.push(this.qryresults);
  console.log(this.tests)
})()

answered Feb 26, 2021 at 21:05

etarhan

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Cəfərov Murad · Accepted Answer · 2021-02-26 21:02:15Z

0

You push array to array. So that, you must add object to array as :

this.tests.push({
  status: 1,
  testresults: [{       
    name: 'test2',
      id: 2
  }]

});

answered Feb 26, 2021 at 21:02

Cəfərov Murad

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1 Comment

user68288 Over a year ago

My code works above -- my questions is on the lines of code with indexes. this.tests[0].testresults.push(this.qryresults); this.tests[1].testresults.push(this.qryresults);

Yoshida Atsushi · Accepted Answer · 2021-02-26 21:06:01Z

0

Yeah, you can fix this issue following code;

tests = [{
    status: 0,
    testresults: [{
        name: 'test',
        id: 1
    }]
}];

qryresults = [{
    status: 1,
    testresults: [{
        name: 'test2',
        id: 2
    }]
}]

tests.push(...qryresults);

answered Feb 26, 2021 at 21:06

Yoshida Atsushi

898 bronze badges

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