Subfleet Hubs / Base Airports (#978)

* Update SubFleet Model

Add hub_id for storing subfleet's main base/hub airport, define a relationship with airport model to get details of the base/hub airport when needed.

* Update Admin / SubFleetController

Added the ability to read and pass hub airports to admin view for create/edit options.

* Update Admin/SubFleets.fields.blade

Added the dropdown for adding/editing main base/hub of a subfleet.

* Add migration for the hub_id column

Co-authored-by: Nabeel S <nabeelio@users.noreply.github.com>
Co-authored-by: Nabeel Shahzad <nshahzad@live.com>

app/Models/Subfleet.php

@@ -8,27 +8,26 @@ use App\Models\Traits\ExpensableTrait;
 use App\Models\Traits\FilesTrait;
 
 /**
- * Class Subfleet
- *
  * @property int     id
  * @property string  type
  * @property string  name
+ * @property int     airline_id
+ * @property int     hub_id
  * @property string  ground_handling_multiplier
  * @property Fare[]  fares
  * @property float   cost_block_hour
  * @property float   cost_delay_minute
  * @property Airline airline
- * @property int     airline_id
+ * @property Airport hub
  */
 class Subfleet extends Model
 {
     use ExpensableTrait;
     use FilesTrait;
 
-    public $table = 'subfleets';
-
     public $fillable = [
         'airline_id',
+        'hub_id',
         'type',
         'name',
         'fuel_type',
@@ -40,6 +39,8 @@ class Subfleet extends Model
         'gross_weight',
     ];
 
+    public $table = 'subfleets';
+
     public $casts = [
         'airline_id'                 => 'integer',
         'turn_time'                  => 'integer',
@@ -55,6 +56,7 @@ class Subfleet extends Model
     public static $rules = [
         'type'                       => 'required',
         'name'                       => 'required',
+        'hub_id'                     => 'nullable',
         'ground_handling_multiplier' => 'nullable|numeric',
     ];
 
@@ -81,6 +83,11 @@ class Subfleet extends Model
         return $this->belongsTo(Airline::class, 'airline_id');
     }
 
+    public function hub()
+    {
+        return $this->hasOne(Airport::class, 'id', 'hub_id');
+    }
+
     public function fares()
     {
         return $this->belongsToMany(Fare::class, 'subfleet_fare')