How do I navigate to the create/new page via Visualforce

Question

I have some apex validation where if a user forgets to enter something in a related list, the system will give them a pageMessage saying that they need to enter a row into that list. We want to create a link that will take them directly to the 'new' version of the page right in the pageMessage (i.e., clicking on the New button on top of the related list).

I thought this would work, but it doesn't:

Commission_Split__c commSplit = new Commission_Split__c(Opportunity__c = quoteRecord.zqu__Opportunity__c);
PageReference prNewCommSplit = new ApexPages.StandardController(commSplit).view();
...
// prNewCommSplit.getUrl(); returns a link back to the quoteRecord

Any ideas?

Answer 1

If you want to create a link in the Page message you will have to set escape = "false" in the page message tag

Then you will have to construct your page message (apexPages.addMessage(...)) you can add

<a href="{YOURURL}">Click Here to Open New Record</a>

Which should output the link in the page message

Answer 2

So the way to get the new/create url is as follows:

Get the key prefix of the object you want to create: String keyPrefix = MyCustomObject__c.sObjectType.getDescribe().getKeyPrefix();

Reconstruct the url to get to the new/create screen:

String errorMessage = 'Your error message here.  Here is link: <a href="/' + 
    keyPrefix + '/e?CF00NQ0000001K2Al=' + quoteRecord.zqu__Opportunity__r.Name + 
    '&CF00NQ0000001K2Al_lkid=' + quoteRecord.zqu__Opportunity__c + '&retURL=%2F' +
    quoteRecord.Id + '&saveURL=%2F' + quoteRecord.Id + '">my create link</a>';
ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, errorMessage));`

The CF00NQ0000001K2Al is the id of the Opportunity field, which should be consistent between orgs.