title: How to direct to submit button to another action
body: <p>how can I jump to another action in controller?</p>
  
  <p>I have form and several submit buttons. Every submmit button has name.</p>
  
  <pre><code>&lt;g:form action="save" method="post"&gt;
     &lt;g:input name="title" value="${letter.title}" /&gt;
     &lt;g:input name="comments[0].text" value="${letter.comments[0].text}" /&gt;
     &lt;g:submitButton name="save" value="save" /&gt;
     &lt;g:submitButton name="addComment" value="add" /&gt;   
  &lt;/g:form&gt;
  
  def save = {
  
       if (params.addComment){
         letter.addToComents(  new Comment() ) 
         render(view:'form', model:["letter": letter])
         return
       }
  
      ...
      if ( letter.save() ) 
      ...
  }
  
  def addComment = {
        ...
      }
  </code></pre>
  
  <p>It works, but it is not good. I want move code from block "addComment" to action addComment:</p>
  
  <pre><code>def save = {
  
       if (params.addComment){
         // it don´t work
         redirect ( action:"addComment" )
       }
  
      ...
      if ( letter.save() ) 
      ...
  }
  
  def addComment = {
        letter.addToComents(  new Comment() ) 
        render(view:'form', model:["letter": letter])
        return
      }
  </code></pre>
  
  <p>Or it exists better solution?
  It would be nice:</p>
  
  <pre><code>&lt;g:submitButton name="save" value="save" action="save" /&gt;
  &lt;g:submitButton name="addComment" value="add" action="addComment"  /&gt; 
  </code></pre>
  
  <p>Thanks a lot
  Tom</p>