build version 400

app/Rules/RelationNotExist.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Crater\Rules;
+
+
+use Illuminate\Contracts\Validation\Rule;
+
+class RelationNotExist implements Rule
+{
+    public $class;
+    public $relation;
+
+    /**
+     * Create a new rule instance.
+     * @param  string  $class
+     * @param  string  $relation
+     * @return void
+     */
+    public function __construct(string $class = null, string $relation = null)
+    {
+        $this->class = $class;
+        $this->relation = $relation;
+    }
+
+    /**
+     * Determine if the validation rule passes.
+     *
+     * @param  string  $attribute
+     * @param  mixed  $value
+     * @return bool
+     */
+    public function passes($attribute, $value)
+    {
+        $relation = $this->relation;
+
+        if ($this->class::find($value)->$relation()->exists()) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Get the validation error message.
+     *
+     * @return string
+     */
+    public function message()
+    {
+        return "Relation {$this->relation} exists.";
+    }
+}