Provide standard clone button functionality to a button on vf page

Question

I have an object whose standard new, edit and view button are overridden with a vf page.I want a Clone button on this vf page which should work exactly like standard clone button. If suppose i open an existing record and click on this clone button on vf page it should load the vf page again and should prepopulate all the field of the old record. I should be able to change the field values and when i click on the save button(already present on the vf page) a new record should be generated. How can i achieve this clone functionality ?

Answer 1

Add a custom button that redirects to /RecordId/e?clone=1

This opens the record in Edit Mode as a clone of the original record.

Answer 2

Clone page has to be customized VF or standard?

For standard you can probably just use /idOfTheOldRecord/e?clone=1.

For custom page (but somehow different from your overrides) - why not display old object's edit page but under Save button's action have something like

Account newAcc = originalAccount.clone(false,true);
try{
   insert newAcc;
   return '/' + newAcc.Id;
} catch(Exception e){
   ApexPages.addMessages(e);
}
return null;

Answer 3

You can use the $Action global variable right in the VF page. Something like the following

<apex:CommandButton action="{!URLFOR($Action.Your_Object__c.Clone)}" value="Clone"/>

Here's the API for global variables http://www.salesforce.com/us/developer/docs/pages/Content/pages_variables_global.htm

Answer 4

Solution which I am following: on click of clone button I am appending an extra attribute, say clone=1 to the url.

testPage.getParameters().put('clone','1');

Now I am checking if the user has ever hit the clone button before hitting the save button.

Cloneyes = ApexPages.currentPage().getParameters().get('clone');
if(Cloneyes !=null){
  save the record as a new record
} else {
  modify the old record
}