Blank/null IATA code isn't unique when added #679 (#681)

app/Contracts/FormRequest.php

@@ -2,6 +2,8 @@
 
 namespace App\Contracts;
 
+use Illuminate\Validation\Rule;
+
 class FormRequest extends \Illuminate\Foundation\Http\FormRequest
 {
     /**
@@ -21,4 +23,18 @@ class FormRequest extends \Illuminate\Foundation\Http\FormRequest
     {
         return [];
     }
+
+    /**
+     * Set a given column as being unique
+     *
+     * @param $table
+     *
+     * @return array
+     */
+    public function unique($table)
+    {
+        return [
+            Rule::unique($table)->ignore($this->id, 'id'),
+        ];
+    }
 }

app/Database/migrations/2020_03_28_174238_airline_remove_nullable.php

@@ -0,0 +1,19 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AirlineRemoveNullable extends Migration
+{
+    public function up()
+    {
+        Schema::table('airlines', function (Blueprint $table) {
+            $table->dropUnique('airlines_iata_unique');
+        });
+    }
+
+    public function down()
+    {
+    }
+}

app/Http/Requests/UpdateAirlineRequest.php

@@ -14,6 +14,10 @@ class UpdateAirlineRequest extends FormRequest
      */
     public function rules(): array
     {
+        $rules = Airline::$rules;
+        $rules['iata'] .= '|unique:airlines,iata,'.$this->id.',id';
+        $rules['icao'] .= '|unique:airlines,icao,'.$this->id.',id';
+
         return Airline::$rules;
     }
 }