How to validate, that there is at least one checkbox checked?

Question

I have a form for creating a question with multiple(as many as one wishes) possible answers. Here is the picture:

The code for a single possible answer:

<div class="input-group">

    {{-- Checkbox for the answer --}}
    <span class="input-group-addon">
        <input type="checkbox" name="answer[0][is_correct]" value="1">
    </span>

    {{-- Input field for the answer --}}
    <input type="text" class="form-control" name="answer[0][body]">

    {{-- . . . --}}

</div>

I need to validate that, there exist at least three answers for a question and at least one of them is correct. How can I achieve this?

Answer 1

I would consider separating your answer text fields from your answer checkboxes for the sake of clarity.

Below hasn't been tested - but something like the following should hopefully help you along?

$numAnswers = count($input->only('answers_text'));
$rules = [
    'answers_checked' => 'array|min:1|max:' . $numAnswers,
    'answers_text' => 'array|min:3|required',
    'answers_text.*' => 'required|string',
];

$v = Validator::make($input, $rules);    
if ($v->fails()) {
  return response()->json($v->errors(), 422);
}
...