[5.5] Dry Unique and Exists rules.

src/Illuminate/Validation/Rules/DatabaseRule.php

@@ -0,0 +1,136 @@
+<?php
+
+namespace Illuminate\Validation\Rules;
+
+use Closure;
+
+trait DatabaseRule
+{
+    /**
+     * The table to run the query against.
+     *
+     * @var string
+     */
+    protected $table;
+
+    /**
+     * The column to check on.
+     *
+     * @var string
+     */
+    protected $column;
+
+    /**
+     * There extra where clauses for the query.
+     *
+     * @var array
+     */
+    protected $wheres = [];
+
+    /**
+     * The custom query callback.
+     *
+     * @var \Closure|null
+     */
+    protected $using;
+
+    /**
+     * Create a new rule instance.
+     *
+     * @param  string  $table
+     * @param  string  $column
+     * @return void
+     */
+    public function __construct($table, $column = 'NULL')
+    {
+        $this->table = $table;
+        $this->column = $column;
+    }
+
+    /**
+     * Set a "where" constraint on the query.
+     *
+     * @param  string  $column
+     * @param  string  $value
+     * @return $this
+     */
+    public function where($column, $value = null)
+    {
+        if ($column instanceof Closure) {
+            return $this->using($column);
+        }
+
+        $this->wheres[] = compact('column', 'value');
+
+        return $this;
+    }
+
+    /**
+     * Set a "where not" constraint on the query.
+     *
+     * @param  string  $column
+     * @param  string  $value
+     * @return $this
+     */
+    public function whereNot($column, $value)
+    {
+        return $this->where($column, '!'.$value);
+    }
+
+    /**
+     * Set a "where null" constraint on the query.
+     *
+     * @param  string  $column
+     * @return $this
+     */
+    public function whereNull($column)
+    {
+        return $this->where($column, 'NULL');
+    }
+
+    /**
+     * Set a "where not null" constraint on the query.
+     *
+     * @param  string  $column
+     * @return $this
+     */
+    public function whereNotNull($column)
+    {
+        return $this->where($column, 'NOT_NULL');
+    }
+
+    /**
+     * Register a custom query callback.
+     *
+     * @param  \Closure $callback
+     * @return $this
+     */
+    public function using(Closure $callback)
+    {
+        $this->using = $callback;
+
+        return $this;
+    }
+
+    /**
+     * Get the custom query callbacks for the rule.
+     *
+     * @return array
+     */
+    public function queryCallbacks()
+    {
+        return $this->using ? [$this->using] : [];
+    }
+
+    /**
+     * Format the where clauses.
+     *
+     * @return string
+     */
+    protected function formatWheres()
+    {
+        return collect($this->wheres)->map(function ($where) {
+            return $where['column'].','.$where['value'];
+        })->implode(',');
+    }
+}

src/Illuminate/Validation/Rules/Exists.php

@@ -2,137 +2,9 @@
 
 namespace Illuminate\Validation\Rules;
 
-use Closure;
-
 class Exists
 {
-    /**
-     * The table to run the query against.
-     *
-     * @var string
-     */
-    protected $table;
-
-    /**
-     * The column to check for existence on.
-     *
-     * @var string
-     */
-    protected $column;
-
-    /**
-     * There extra where clauses for the query.
-     *
-     * @var array
-     */
-    protected $wheres = [];
-
-    /**
-     * The custom query callback.
-     *
-     * @var \Closure|null
-     */
-    protected $using;
-
-    /**
-     * Create a new exists rule instance.
-     *
-     * @param  string  $table
-     * @param  string  $column
-     * @return void
-     */
-    public function __construct($table, $column = 'NULL')
-    {
-        $this->table = $table;
-        $this->column = $column;
-    }
-
-    /**
-     * Set a "where" constraint on the query.
-     *
-     * @param  string  $column
-     * @param  string  $value
-     * @return $this
-     */
-    public function where($column, $value = null)
-    {
-        if ($column instanceof Closure) {
-            return $this->using($column);
-        }
-
-        $this->wheres[] = compact('column', 'value');
-
-        return $this;
-    }
-
-    /**
-     * Set a "where not" constraint on the query.
-     *
-     * @param  string  $column
-     * @param  string  $value
-     * @return $this
-     */
-    public function whereNot($column, $value)
-    {
-        return $this->where($column, '!'.$value);
-    }
-
-    /**
-     * Set a "where null" constraint on the query.
-     *
-     * @param  string  $column
-     * @return $this
-     */
-    public function whereNull($column)
-    {
-        return $this->where($column, 'NULL');
-    }
-
-    /**
-     * Set a "where not null" constraint on the query.
-     *
-     * @param  string  $column
-     * @return $this
-     */
-    public function whereNotNull($column)
-    {
-        return $this->where($column, 'NOT_NULL');
-    }
-
-    /**
-     * Register a custom query callback.
-     *
-     * @param  \Closure $callback
-     * @return $this
-     */
-    public function using(Closure $callback)
-    {
-        $this->using = $callback;
-
-        return $this;
-    }
-
-    /**
-     * Format the where clauses.
-     *
-     * @return string
-     */
-    protected function formatWheres()
-    {
-        return collect($this->wheres)->map(function ($where) {
-            return $where['column'].','.$where['value'];
-        })->implode(',');
-    }
-
-    /**
-     * Get the custom query callbacks for the rule.
-     *
-     * @return array
-     */
-    public function queryCallbacks()
-    {
-        return $this->using ? [$this->using] : [];
-    }
+    use DatabaseRule;
 
     /**
      * Convert the rule to a validation string.