Adding ID to function to prevent not null error - php

Question

I have a function for adding a comment:
public function addComment(Request $request)
{
$request->validate([
'body' => 'required',
]);
$entry = new Comment();
$entry->body = $request->body;
$entry->save();
return redirect('/');
}
I need to also pass in the films table id, known in the comments table as film_id. This field can not be null. The above doesnt take this field into account and so I get the following message:
SQLSTATE[23000]: Integrity constraint violation: 19 NOT NULL
constraint failed: comments.film_id (SQL: insert into "comments"
("body", "updated_at", "created_at") values
I have tried to pass in the film id by doing variations of the below but no success.
public function addComment(Request $request, $id)
{
$request->validate([
'body' => 'required',
'film_id' => 'required',
]);
$entry = new Comment();
$film_id = Film::find($id);
$entry->body = $request->body;
$entry->film_id = $film_id;
$entry->save();
return redirect('/');
Comment model:
class Comment extends Model
{
public function film()
{
return $this->belongsTo(Film::class);
}
}
Film model:
class Film extends Model
{
public function comments()
{
return $this->hasMany(Comment::class);
}
}

Answer 1

you are not passing the id, you were passing the film object
public function addComment(Request $request, $id)
{
$film = Film::find($id);
$entry = new Comment();
$entry->body = $request->body;
$entry->film_id = $film->id;
$entry->save(); //your comment is saved with proper film_id
}
or
public function addComment(Request $request, $id)
{
$film = Film::find($id);
$film->comments()->save(['body'=>$request->body]);
}