Added Unique Field Attribute Doc

Signed-off-by: Kristian Matthews <kristian.matthews@me.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/user_guide_src/source/database/forge.rst b/user_guide_src/source/database/forge.rst
index 646e3a56e..cb5c35662 100644
--- a/user_guide_src/source/database/forge.rst
+++ b/user_guide_src/source/database/forge.rst
@@ -97,6 +97,7 @@ Additionally, the following key/values can be used:
 -  auto_increment/true : generates an auto_increment flag on the
    field. Note that the field type must be a type that supports this,
    such as integer.
+-  unique/false : to generate a unique key for the field definition.
 
 ::
 
@@ -110,6 +111,7 @@ Additionally, the following key/values can be used:
 		'blog_title' => array(
 			'type' => 'VARCHAR',
 			'constraint' => '100',
+			'unique' => TRUE,
 		),
 		'blog_author' => array(
 			'type' =>'VARCHAR',
@@ -175,14 +177,14 @@ below is for MySQL.
 
 	$this->dbforge->add_key('blog_id', TRUE);
 	// gives PRIMARY KEY `blog_id` (`blog_id`)
-	
+
 	$this->dbforge->add_key('blog_id', TRUE);
 	$this->dbforge->add_key('site_id', TRUE);
 	// gives PRIMARY KEY `blog_id_site_id` (`blog_id`, `site_id`)
-	
+
 	$this->dbforge->add_key('blog_name');
 	// gives KEY `blog_name` (`blog_name`)
-	
+
 	$this->dbforge->add_key(array('blog_name', 'blog_label'));
 	// gives KEY `blog_name_blog_label` (`blog_name`, `blog_label`)
 
@@ -261,7 +263,7 @@ number of additional fields.
 	$fields = array(
 		'preferences' => array('type' => 'TEXT')
 	);
-	$this->dbforge->add_column('table_name', $fields); 
+	$this->dbforge->add_column('table_name', $fields);
 	// Executes: ALTER TABLE table_name ADD preferences TEXT
 
 If you are using MySQL or CUBIRD, then you can take advantage of their