how to pass input to api from angular forms without formControlName?

I am passing some data from angular to django rest api, Which is as follows

first what django need in for api:

notice
    {
      description: something,
      classname : in which class notice is provided,
      students : from dropdown
    }

what I am passing from angular

description by formController
students by formcontroller

now my issue is that I am not taking classname as input because It doesn’t make sense here

so is there any other way by which I directly pass classname to api as input without showing on UI

my angular code:

this.announceForm = this._formBuilder.group({
  students   : [selectedStudents, Validators.required],
  description: ['', Validators.required]
});

here is django’s input fields

Answer

Of course you can. The value of the form is just an object. You can either hard-code the value you want as part of the form group, or you could add it to the value you pass to your service.

Just because you add a value to a form group doesn’t mean you have to present it to the user.

Example using a hard-coded value:

this.form = this.formBuilder.group({
  students: [
   '', [ Validators.required ]
  ],
  classname: [
    'some value'
  ],
  description: [
    '', [ Validators.required ]
  ],
});

Or add the value later:

this.form = this.formBuilder.group({
  students: [
   '', [ Validators.required ]
  ],
  description: [
    '', [ Validators.required ]
  ],
});

const data = {
  ...this.form.value,
  classname: 'whatever',
};

this.yourService.whatever(data);

I typically just hard-code the value into the formgroup so I can pass form.value to the service method.