osb/app/Traits/NextKey.php

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<?php
/**
* Works out the next ID to use for an Eloquent Table.
*
* If we update records, we update the record_id table
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*/
namespace App\Traits;
use Illuminate\Database\Eloquent\ModelNotFoundException;
use Illuminate\Support\Facades\Log;
use App\Models\{Module,Record};
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trait NextKey
{
public static function boot()
{
parent::boot();
static::creating(function($model)
{
$model->id = self::NextId();
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if (! $model->site_id)
$model->site_id = config('SITE_SETUP')->id;
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});
static::saved(function($model)
{
if ($model->wasRecentlyCreated) {
if (! defined(get_class($model).'::RECORD_ID'))
throw new \Exception('Missing record_id const for '.get_class($model));
try {
$mo = Module::where('name',$model::RECORD_ID)->firstOrFail();
} catch (ModelNotFoundException $e) {
Log::critical(sprintf('Module [%s] not recorded, we\'ll create it.',$model::RECORD_ID),['model'=>$model->getAttributes()]);
$mo = new Module;
$mo->name = $model::RECORD_ID;
$mo->site_id = $model->site_id ?: config('SITE_SETUP')->id;
$mo->save();
}
if (! $mo->record) {
$mo->record = new Record;
$mo->record->module_id = $mo->id;
$mo->record->site_id = $model->site_id ?: config('SITE_SETUP')->id;
}
$mo->record->id = $model->id;
$mo->record->save();
}
});
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}
public static function NextId()
{
return (new self)->max('id')+1;
}
}