diff --git a/src/Contracts/RepositoryContract.php b/src/Contracts/RepositoryContract.php
index 0ec65e4..307e1bf 100644
--- a/src/Contracts/RepositoryContract.php
+++ b/src/Contracts/RepositoryContract.php
@@ -5,7 +5,6 @@
 use Illuminate\Support\Collection;
 use Illuminate\Pagination\Paginator;
 use Illuminate\Database\Eloquent\Model;
-use Torann\LaravelRepository\Exceptions\RepositoryException;
 
 interface RepositoryContract
 {
@@ -113,7 +112,7 @@ public function pluck($value, $key = null);
      * @param null  $limit
      * @param array $columns
      *
-     * @return Paginator
+     * @return \Illuminate\Contracts\Pagination\Paginator
      */
     public function paginate($limit = null, $columns = ['*']);
 
@@ -123,7 +122,7 @@ public function paginate($limit = null, $columns = ['*']);
      * @param null  $limit
      * @param array $columns
      *
-     * @return \Illuminate\Pagination\Paginator
+     * @return \Illuminate\Contracts\Pagination\Paginator
      */
     public function simplePaginate($limit = null, $columns = ['*']);
 
@@ -168,10 +167,11 @@ public function toSql();
      * Add a message to the repository's error messages.
      *
      * @param string $message
+     * @param string $key
      *
-     * @return null
+     * @return self
      */
-    public function addError($message);
+    public function addError($message, string $key = 'message');
 
     /**
      * Get the repository's error messages.
diff --git a/src/Repositories/AbstractRepository.php b/src/Repositories/AbstractRepository.php
index b68519a..d190850 100755
--- a/src/Repositories/AbstractRepository.php
+++ b/src/Repositories/AbstractRepository.php
@@ -319,6 +319,29 @@ public function getOrderBy()
         return $this->orderBy;
     }
 
+    /**
+     * Set searchable array.
+     *
+     * @param array|string $key
+     * @param mixed        $value
+     *
+     * @return self
+     */
+    public function setSearchable($key, $value = null)
+    {
+        // Allow for a batch assignment
+        if (is_array($key) === false) {
+            $key = [$key => $value];
+        }
+
+        // Update the searchable values
+        foreach ($key as $k => $v) {
+            $this->searchable[$k] = $v;
+        }
+
+        return $this;
+    }
+
     /**
      * Return searchable keys.
      *
@@ -381,7 +404,9 @@ public function search($queries)
                 $value = Arr::get($queries, $param, '');
 
                 // Validate value
-                if ($value === '' || $value === null) continue;
+                if ($value === '' || $value === null) {
+                    continue;
+                }
 
                 // Columns should be an array
                 $columns = (array) $columns;
@@ -626,6 +651,21 @@ public function makeModel()
         return $this->modelInstance = new $this->model;
     }
 
+    /**
+     * Get a new query builder instance with the applied
+     * the order by and scopes.
+     *
+     * @param bool $skipOrdering
+     *
+     * @return \Illuminate\Database\Eloquent\Builder
+     */
+    public function getBuilder(bool $skipOrdering = false)
+    {
+        $this->newQuery($skipOrdering);
+
+        return $this->query;
+    }
+
     /**
      * Get the raw SQL statements for the request
      *
@@ -685,14 +725,15 @@ protected function applyScope()
      * Add a message to the repository's error messages.
      *
      * @param string $message
+     * @param string $key
      *
-     * @return null
+     * @return self
      */
-    public function addError($message)
+    public function addError($message, string $key = 'message')
     {
-        $this->getErrors()->add('message', $message);
+        $this->getErrors()->add($key, $message);
 
-        return null;
+        return $this;
     }
 
     /**
diff --git a/src/Traits/Cacheable.php b/src/Traits/Cacheable.php
index e4fbdc6..7c70a54 100644
--- a/src/Traits/Cacheable.php
+++ b/src/Traits/Cacheable.php
@@ -74,7 +74,7 @@ public function skippedCache()
      *
      * @return string
      */
-    public function getCacheKey($method, $args = null, $tag)
+    public function getCacheKey($method, $args = null, $tag = '')
     {
         // Sort through arguments
         foreach ($args as &$a) {
@@ -86,7 +86,8 @@ public function getCacheKey($method, $args = null, $tag)
         // Create hash from arguments and query
         $args = serialize($args) . serialize($this->getScopeQuery());
 
-        return sprintf('%s-%s@%s-%s',
+        return sprintf(
+            '%s-%s@%s-%s',
             config('app.locale'),
             $tag,
             $method,