title: Codeigniter creating an ENUM field with dbforge
body: <p>I create a ENUM field, here is my code:</p>
  
  <pre><code>$field['test'] = array(
    'type' =&gt; 'ENUM',
    'constraint' =&gt; array('a','b','c'),
    'default'=&gt; "a"
  );
  $this-&gt;dbforge-&gt;add_field($field);
  $this-&gt;dbforge-&gt;create_table('demo'); 
  </code></pre>
  
  <p>And I got a message:</p>
  
  <blockquote>
    <p>Error Number: 1064</p>
    
    <p>You have an error in your SQL syntax; check the manual that
    corresponds to your MySQL server version for the right syntax to use
    near ‘Array) DEFAULT ‘a’ NOT NULL ) DEFAULT CHARACTER SET utf8 COLLATE
    utf8_general_ci’ at line 2</p>
    
    <p>CREATE TABLE <code>ci_demo</code> ( <code>test</code> ENUM(Array) DEFAULT ‘a’ NOT NULL )
    DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;</p>
  </blockquote>
  
  <p>Please help me, thank you very much.</p>