How do I disable language fallback on a template for a given language in multilingual site?

Question

We are building a multilingual site and language fallback is enabled for all the languages to fall back to English language content. Though one exception is that, we don't want pages of a specific template on one of the language sites to fallback to English Language. My requirements are very similar to this post Disable Language Fallback for specific item language As per the answer in that post, using "Enforce Version Presence - Hide this item if no language version exists [shared]" settings, it disables the language fallback for all the language site. So it doesn't meet our requirement. So How can I achieve disabling fallback on a specific template for a given language?

Answer 1

What you can do is patch the GetLanguageFallbackItem processor in the GetLanguageFallbackItem pipeline and check for your custom requirements:

public class CustomGetLanguageFallbackItem : Sitecore.Pipelines.ItemProvider.GetItem.GetLanguageFallbackItem
{
    public override void Process(GetItemArgs args)
    {
        var item = args.Database.GetItem(args.ItemId);
        if (item != null && Sitecore.Context.Site != null)
        {
            // Check for custom requirements
            if (Sitecore.Context.Site.Name == "site-with-disabled-fallback" 
                && item.TemplateID == new ID("MY-TEMPLATE-GUID"))
            {
                return; // abort processor to disable fallback
            }
        }

        // Proceed with fallback processor
        base.Process(args);
    }
}

Config patch:

 <configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <pipelines>
      <group name="itemProvider" groupName="itemProvider">
        <pipelines>
          <getItem >
            <processor type="My.Namespace.CustomGetLanguageFallbackItem, My.Namespace" 
                       patch:replace="Sitecore.Pipelines.ItemProvider.GetItem.GetLanguageFallbackItem, Sitecore.Kernel"/>
          </getItem>
        </pipelines>
      </group>
    </pipelines>
  </sitecore>
</configuration>

Note: this has not been tested thoroughly. Please leave comment if it works for you.