How to use in_array with belongsToMany relationships?-CodePudding

I'm using belongsToMany with the model Riskarea because I have a pivot table called riskarea_fields which join the Riskfield model among Riskarea:

class Riskarea extends Model
{
    use SoftDeletes;

    protected $table = 'riskareas';
    protected $fillable = [
        'name',
        'icon',
    ];

    public function riskfields()
    {
        return $this->belongsToMany(
            Riskfield::class,
            'riskarea_fields',
            'area_id',
            'field_id'
        );
    }
}

In my edit.blade.php I have this code:

@foreach ($riskfields as $rf)
    <option value="{{ $rf->id }}" @if (old('active', in_array($riskarea->riskfields, $rf->id))) selected="selected" @endif>
        {{ $rf->name }}
    </option>
@endforeach

What I'm trying to do is iterate over the riskfields property and select all riskfields options that are within riskarea->riskfields.

Unfortunately I got:

in_array(): Argument #2 ($haystack) must be of type array, int given

This is my edit method:

public function edit(Riskarea $riskarea)
{
    return view('riskareas.edit', [
        'riskarea' => $riskarea,
        'riskfields' => Riskfield::all()
    ]);
}

any idea?

CodePudding user response：

Since you want to check if each id is present in the associated riskfields, pluck their IDs before hand.

public function edit(Riskarea $riskarea)
{
    return view('riskareas.edit', [
        'riskarea' => $riskarea,
        'selectedRiskfieldIds' => $riskarea->riskfields()->pluck('id')->toArray(),
        'riskfields' => Riskfield::all(),
    ]);
}

Then you can do

@foreach ($riskfields as $rf)
    <option value="{{ $rf->id }}" @if (old('active', in_array($rf->id, $selectedRiskfieldIds))) selected="selected" @endif>
        {{ $rf->name }}
    </option>
@endforeach

CodePudding user response：

You have a small mistake. You are using the in_array() function incorrectly. The syntax is: in_array(mixed $needle, array $haystack) . You've got it backwards. To use the in_array function you also need an array. Therefore, you convert the collection into an array. You do this with the Laravel function toArray(). https://laravel.com/docs/8.x/collections#method-toarray. Change it in your blade file from:

in_array($riskarea->riskfields, $rf->id)

in_array($rf->id, $riskarea->riskfields->toArray())).

in_array(mixed $needle, array $haystack, bool $strict = false): bool https://www.php.net/manual/de/function.in-array.php