Cannot update multiple rows with same value in Laravel Vue Axios - laravel

Question

can't update multiple row with a single value passing from vue js.I want to add pay value with database column advance with previous value in database.And also how to pass substraction of patientInfo.due-form.pay using axios.
Vuejs template:
<form #submit.prevent="updatePatientPayment">
<table class="table">
<tfoot>
<tr>
<td colspan="5" class="text-right">Total</td>
<td class="text-right">{{patientInfo.total}}</td>
</tr>
<tr>
<td colspan="5" class="text-right">Advance Paid</td>
<td class="text-right">{{patientInfo.advance}}</td>
</tr>
<tr>
<td colspan="5" class="text-right">Due</td>
<td class="text-right" >{{patientInfo.due}}</td>
</tr>
<tr>
<td colspan="5" class="text-right">Payable</td>
<input class="form-control text-right" type="number" v-model="form.pay"/>
</tr>
<tr>
<td colspan="5" class="text-right">New Due</td>
<td class="text-right">{{patientInfo.due-form.pay}}</td>
</tr>
</tfoot>
</table>
<b-button type="submit" variant="success">Submit</b-button>
</form>
Vuejs Script:
<script>
export default {
data(){
return{
id:this.$route.params.id,
patient:[],
patientInfo:{},
form:{
pay:0,
}
}
},
methods:{
updatePatientPayment() {
this.$http.post('http://127.0.0.1:8000/api/updatePatientPayment/' + this.id,this.form)
.then(()=>{
self.message = 'Data is entered';
})
},
}
</script>
Laravel Controller:
public function updatePatientPayment($id, Request $request)
{
$updatePatientPayment = Patient::find([$id]);
foreach($updatePatientPayment as $p){
$p->advance = $p->update([$advance + $request->pay]);
$p->save();
}
return response()->json(['successfully updated']);
}

Answer 1

As already mentioned you don't need an array here if you only update one Patient.
public function updatePatientPayment($id, Request $request)
{
// 1. Get the patient you want to update
// Do not wrap $id in [] if you only need to find one entity
$patient = Patient::find($id);
// 2. Change the value of the patient
// Do not use update when you assign the value to the model
$patient->advance += $request->pay;
// 3. Save the change
$patient->save();
// 4. Respond
return response()->json(['successfully updated']);
}
Alternatively, you can also use update if you want to, but be aware that your advance field must be defined as fillable to do so.
public function updatePatientPayment($id, Request $request)
{
// 1. Get the patient you want to update
// Do not wrap $id in [] if you only need to find one entity
$patient = Patient::find($id);
// 2. Update directly
$patient->update(['advance' => $patient->advance + $request->pay]);
// 3. Respond
return response()->json(['successfully updated']);
}
update will already save your change.
In your code $advance is not defined. You cannot access the existing column as you did.