Liferay: authorization of actions on dynamic data lists

Another feature you might want to include in your dynamic data list template, is that the edit button is only shown to users of a certain role. This, again, requires some thinking and trying, but I have done it for you. What I did, was get all the roles for the current user (through the user id in the request's theme display).

#set ($user_id = $request.theme-display.user-id)

#set ($roles = $serviceLocator.findService("com.liferay.portal.service.RoleLocalService").getUserRoles($getterUtil.getLong($user_id)))

Now, we can loop the roles, and set a variable if the user has a certain role.

#set ($can_edit = 'false')

#foreach ($role in $roles)
    #if ($role.name == 'Administrator')
        #set ($can_edit = 'true')
    #end
#end

Later in the template, we can than use the $can_edit variable to conditionally display the edit link.

Liferay: dynamic data lists record actions

I'm still working with Liferay 6.1, and more specific their dynamic data lists. A question I've encountered a lot, and just ran into, is how to display the action buttons of a record in a custom list template. I haven't found the answer online, so I started to try some things myself.

 I figured the solution would be a lot like in my previous post: using the generated URL. I again switched back to the default list view, and copied the URL for the 'Edit' action. Stripping it down, this is the result:

/your_page?p_p_id=169_INSTANCE_ToH96dipcgdr&struts_action=%2Fdynamic_data_list_display%2Fedit_record&cmd=update&redirect=%2Fyour_page&recordId=$record.getRecordId()

Notice the p_p_id is copied from the URL (you can also get it from the $request), while the record id is dynamically fetched from the resultset's current record. Another important parameter is redirect. Provide it with the URL of the page you're going to display your list on. It will make sure the user will return to that page after saving or canceling the edit action. If you forget this, the user is stuck on the edit page.

Liferay: dynamic data list detail

I've been working with Liferay 6.1's dynamic data lists for the last few days. I like how easy it is to create a CRUD system for data lists. The out-of-the-box functionality to display lists using the Liferay defaults and a custom VM-template is amazing.

To display a detail of a record, however, is a lot more painful. For some reason, there's no VM-template support there. So what I wanted to do, was the following:

• Create a detail link in the list VM-template
• Let the detail page display my own custom page

Not all that much asked, I'd think, yet this was NOT easy to achieve in Liferay. The documentation in this area is very limited, and basically only covers the creation of a list-template. So, first things first, I created my custom list-template using the Liferay documentation, and my dynamic data list looked good.

Of course, I wanted links in that list, to click through to the details of a record. This was the first difficulty I encountered. I couldn't find any clues or documentation on how to get the correct link. So what I did, was switching the list view back to 'default', and copied the link URL there. It looked really, really ugly.

I then started to dissect that URL. I concluded that there's lot of parameters I didn't need, so I stripped it down to the bare minimum: the portlet ID, a struts action and a record ID. The portlet ID and struts action can be copied from the URL the default list provides, the record ID is dynamic and can be fetched using $record.getRecordId(). My URL looked like this:

/your_page?p_p_id=169_INSTANCE_ToH96dipcgdr&struts_action=%2Fdynamic_data_list_display%2Fview_record&recordId=$record.getRecordId()

This of course redirects to the default detail page, which might be OK for adding and editing records, but not for displaying them in an enterprise application. I somehow had to either edit the detail page, or find a way to redirect the detail-link to another page.

That was the second obstacle. Editing the detail-page wasn't really an option, since it would then be altered for ALL detail pages of all records, not just the ones I wanted to display at that time. With that idea out of the way, I had to find a way to make the detail URL redirect to a custom JSP. Therefor, I had to create a new struts action, and map it to a new JSP I also had to create.

The easiest way to do that is using a hook. In that hook, we need to do 3 things:

• Create an Action class (extending from BaseStrutsPortletAction)
• Create a custom JSP
• Map the Action class to a certain path

The last one is the easiest: simply add this to your liferay-hook.xml

  /dynamic_data_list_display/view_office
  be.c4j.hook.action.SomeAction
 

This means you have to change the struts-action parameter in your detail-url to %2Fdynamic_data_list_display%2Fview_office. Of course, we also need to define the SomeAction class.

import com.liferay.portal.kernel.struts.BaseStrutsPortletAction;
import com.liferay.portal.kernel.util.ParamUtil;

import javax.portlet.PortletConfig;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;

import com.liferay.portlet.dynamicdatalists.model.DDLRecord;
import com.liferay.portlet.dynamicdatalists.service.DDLRecordLocalServiceUtil;

public class SomeAction extends BaseStrutsPortletAction {

 @Override
 public String render(PortletConfig portletConfig, RenderRequest renderRequest,
   RenderResponse renderResponse) throws Exception {
  
  long recordId = ParamUtil.getLong(renderRequest, "recordId");
  
  DDLRecord record = DDLRecordLocalServiceUtil.getRecord(recordId);
  
  renderRequest.setAttribute("ddlRecord", record);
  
  return "/portlet/dynamic_data_lists/view_office.jsp";
 }
}

Now all you have to do is build the JSP. Make sure you place in the folder $customs_jsps$\html\portlet\dynamic_data_lists. In the JSP you can access the ddlRecord attribute.

<%
DDLRecord record = (DDLRecord)request.getAttribute("ddlRecord");

%>; 

This is a field of our record<%= record.getFieldValue("fieldName") %>;

If you know what to do, it isn't all that hard, but it took me a lot of time to figure this out. Liferay offers a lot of out-of-the-box functionality, but sometimes you have to go through a lot of trouble for adding just that little extra.