OCTOBERCMS Dropdown options dependent on selected value on other dropdown - php

Question

I'm stuck with this problem and i can't figure out how to solve after some time searching for a example.
The two dropdowns options are table dependent on their values.
I have the one table with 'area' values (nested with simple tree working ok) with the following structure on fields.yaml file:
fields:
id:
label: Número
oc.commentPosition: ''
span: auto
disabled: 1
type: number
area_id:
label: 'Parente de'
oc.commentPosition: ''
emptyOption: 'Sem valor'
span: auto
type: dropdown
area:
label: Área
oc.commentPosition: ''
span: full
required: 1
type: text
I also have another table 'modulos' values with the following structure in fields.yaml:
fields:
modulo:
label: Módulo
oc.commentPosition: ''
span: auto
required: 1
type: text
area:
label: Área
oc.commentPosition: ''
nameFrom: area
emptyOption: 'Sem valor'
span: auto
descriptionFrom: id
type: relation
In the 'Area' model I have:
...
public $hasMany = [
'modulos' => ['JML\Gkb\Models\Modulos']
];
In the 'Modulos' model I have
....
public $belongsTo = [
'area' => ['\JML\Gkb\Models\Area']
];
I have other model that have relations with previous fields and two dropdown fields working ok without any filter, and the troubleshoting field (modulos) where I can't find a way to filter based on the values of 'Area' dropdown I have the following in fields.yaml.
....
modulo_id:
label: mod
oc.commentPosition: ''
emptyOption: 'Sem valor'
span: auto
required: 1
dependsOn:
area
type: dropdown
tab: Geral
In my models PHP file where I have the dropdowns defined, I have:
public function getModuloIdOptions() {
return Modulos::where('area_id', '=', $this->area)->lists('modulo', 'id');
}
That to me seems logical (maybe not) and I tried with DB also and many more other. I tried with dd() to see if I can get the values from the first dropdown to no avail. If I try to filter the values, no value appears at all (except an empty value).
Any help out there ???
TIA
JL

Answer 1

The dataset is passed as the second argument to get the "getOptions" method. Here is an alternative approach that may work:
public function getModuloIdOptions($value, $data) {
return Modulos::where('area_id', '=', array_get($data, 'area'))->lists('modulo', 'id');
}
You may also want to try accessing the area_id value:
public function getModuloIdOptions(){
return Modulos::where('area_id', '=', $this->area_id)->lists('modulo', 'id');
}
Or less efficiently the area->id value (may require exception handling):
public function getModuloIdOptions(){
return Modulos::where('area_id', '=', $this->area->id)->lists('modulo', 'id');
}

Answer 2

I solved the problem with that dropdown and others with the same objective with the following steps:
I have the the 'Relation' widget on them. Changed them to 'Dropdown' widget.
Defined the 'Depends on' field.
Defined the 'Preset' field to the one above. I think that is the missing link to the problem solution not documented anywhere and i get there on try/error basis (may be it is valuable to add this to the October documentation).
Filter options with the snipet code on the end of my question or the second snipet of Samuel answer.
That solved my problem.
Thanks all.