I’ve done some API in spring and try to add some data in the server with angular.

Here’s the @Entity in Spring

@Id
@GeneratedValue(strategy= GenerationType.IDENTITY)
long id;

@Column(name="nome")
String name;

@Column(name = "descrizione")
String descrizione;

@Column(name = "img")
String img;

@ManyToOne
@JoinColumn (name = "id_luogo")
Luoghi idLuogo;

this is the method in the controller of the API call that I’m having issues with

    @PostMapping("/add")
public ResponseEntity<IncontriTerreni> addIncontro(@RequestBody IncontriTerreni incontro){
    IncontriTerreni newIncontro= service.addIncontro(incontro);
    return new ResponseEntity<>(newIncontro,HttpStatus.CREATED);
}

In angular I’ve created a dialog that pass some data, the id is present in the form but when I click the submit button it gaves me an internal server error

add-encounter-form.component.ts:31 
    
    
   POST http://localhost:9595/oota-reg/api/incontri-terreni/add 500

and in the error it says:

“could not execute statement [Column ‘id_luogo’ cannot be null] [insert into incontri_terreni (descrizione,id_luogo,img,nome) values (?,?,?,?)]; SQL [insert into incontri_terreni (descrizione,id_luogo,img,nome) values (?,?,?,?)]; constraint [null]”

How can I solve this?

This is the form :

idLuogo

Nome

Descrizione

Link Immagine

    <div>
        <button mat-stroked-button color="primary" type="submit">Invia</button>
    </div>

</form>

And this is the TS file

    export class AddEncounterFormComponent implements OnInit{
  ngOnInit(): void {
    this.incontro.id_luogo.id = this.data.id
  }
  
  private service :TerreniService = inject(TerreniService);
  public data : any = inject(MAT_DIALOG_DATA);



  onSubmit() {
    console.log(this.incontro);
    
    this.service.addIncontro(this.incontro).subscribe({
      next: (resp) =>{
        console.log(resp);
        
      },
      error: (err)=>{
        console.log(err);
        
      },
      
    })
    
    
  }

  incontro : any={
    name : "",
    descrizione : "",
    img : "",
    id_luogo: {id: 0}
  }

}