Recommended way to inherit properties from parent pages

Vote:
 

Hi there,

I am looking to inherit properties from parent pages based on a specific flag. I had a look at the FAQs section of the website and saw that dynamic properties are recommended for this, see https://world.episerver.com/FAQ/Items/How-do-I-inherit-values-between-pages/

I am currently on EpiServer v11 - Is this FAQ item still relevant?

Cheers,
Tom.

#208553
Oct 27, 2019 23:13
Vote:
 

Hi Tom,

I think the FAQ item you referred is for version 4 and 5.

So I think you can create a property on the BasePage and then use it where you want because it is available on all the pages and you can write your own logic to retrieve it.

#208558
Edited, Oct 28, 2019 11:02
Vote:
 

Hi Tom

You could emulate the deprecated Dynamic Properties behaviour, by adding the field to a base page type, an shared interface or similar. Then when you need the property value, you can look at the current page first to see if the property has a value.

If it has a value, return it. If it doesn't have a value, traverse up to the first immediate ancestor and check if that has a value for the property. If it has a value, return. If it doesn't, you continue upwards, until you reach a page that doesn't have the property.

#208561
Oct 28, 2019 11:41
Vote:
 

You could create an extension method, something like this:

private static object GetPropertyFromCurrentPageOrParent(this PageData pageData, string propertyName)
{
   if (pageData.Property[propertyName] != null)
      return pageData.Property[propertyName].Value;

   if (pageData.ContentLink == ContentReference.RootPage)
      return null;

   return ServiceLocator.Current.GetInstance<IContentLoader>().Get<PageData>
}

Use it to get property value by property name. If the property is null, property with the same name from the parent will be returned.

Calling ServiceLocator from within a recursive function is probably not the best idea. So you could rewrite it, like this:

private static object GetPropertyFromCurrentPageOrParent(this PageData pageData, string propertyName)
{
   while (true)
   {
      if (pageData.Property[propertyName] != null) return pageData.Property[propertyName].Value;
      if (pageData.ContentLink == ContentReference.RootPage) return null;
      pageData = ServiceLocator.Current.GetInstance<IContentLoader>().Get<PageData>(pageData.ParentLink);
      }
}
#208619
Edited, Oct 28, 2019 22:43
Vote:
 

Thank you all for your help.

I managed to solve this through the use of an interface shared across multiple page types (which provided the shared fields I needed).

I then made use of an ActionFilter - PageContextActionFilter : IResultFilter to execute the code before the page loaded (if the type is correct). I also used _contentLoader.GetAncestors(currentContentLink) to get a list of the parent pages. I looped through the list to check if my inherit field had been set and if it had then I updated the values in the view model of the current page.

Cheers,
Tom.

#208620
Oct 28, 2019 23:30
Vote:
 

Another solution is described here:
https://www.codeart.dk/blog/2018/9/good-ol-dynamic-properties/

And a slightly modified version near the end of this:
https://www.codeart.dk/blog/2019/10/ascend-2019-code-mania/

#208673
Oct 30, 2019 9:47
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