如何修复"undefined variable"

Question

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<div class="col-sm-3">
<label class="visually-hidden" for="mechanic_id">Mechanic</label>
<select name="mechanic_id" class="form-control form-select" id="mechanic_id" required>
@foreach ($mechanic as $item)
@if (old('mechanic') == $item->id)
<option value="{{ $item->id }}" selected>{{ $item->nama }}</option>
@else
<option value="{{ $item->id }}">{{ $item->nama }}</option>
@endif
@endforeach
</select>

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Answer 1

用select标签的name属性替换if条件变量

@if (old('mechanic') == $item->id)

取代

@if (old('mechanic_id') == $item->id)