Hi!

I'm just upgrading Umbraco 6 to 7 and found problem with property value converters.

I want to use obsolete Media Picker which stores value as integer and have enabled property value converters but when I'm trying to load node for editing I see error like this:

Umbraco Media picker Mapping types: Content -> String[] Umbraco.Core.Models.Content -> System.String[] Destination path: ContentItemDisplay.Urls.Urls Source value: Umbraco.Core.Models.Content

More detailed error from Umbraco Log:

2020-09-07 16:08:51,867 [P1844/D3/T44] ERROR Umbraco.Web.Editors.ContentController - Unhandled controller exception occurred
AutoMapper.AutoMapperMappingException: 

Mapping types:
Content -> String[]
Umbraco.Core.Models.Content -> System.String[]

Destination path:
ContentItemDisplay.Urls.Urls

Source value:
Umbraco.Core.Models.Content ---> System.InvalidOperationException: The current pre-value collection is array based, use the PreValuesAsArray property instead. This usually indicates that the content cache is corrupt; the content cache has been rebuilt in an attempt to self-fix the issue.
   at Umbraco.Web.PublishedCache.XmlPublishedCache.XmlPublishedContent.InitializeNode(XmlNode xmlNode, Boolean legacy, Boolean isPreviewing, Int32& id, Guid& key, Int32& template, Int32& sortOrder, String& name, String& writerName, String& urlName, String& creatorName, Int32& creatorId, Int32& writerId, String& docTypeAlias, Int32& docTypeId, String& path, Guid& version, DateTime& createDate, DateTime& updateDate, Int32& level, Boolean& isDraft, PublishedContentType& contentType, Dictionary`2& properties, Func`3 getPublishedContentType)
   at Umbraco.Web.PublishedCache.XmlPublishedCache.XmlPublishedContent.InitializeNode()
   at Umbraco.Web.PublishedCache.XmlPublishedCache.XmlPublishedContent.EnsureNodeInitialized(Boolean andChildren, Boolean andParent)
   at Umbraco.Web.PublishedCache.XmlPublishedCache.XmlPublishedContent.get_Path()
   at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedContentCache.AddToCacheIfDeepestRoute(UmbracoContext umbracoContext, IPublishedContent content, String route)
   at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedContentCache.GetByRoute(UmbracoContext umbracoContext, Boolean preview, String route, Nullable`1 hideTopLevelNode)
   at Umbraco.Web.Routing.ContentFinderByNiceUrl.FindContent(PublishedContentRequest docreq, String route)
   at Umbraco.Web.Routing.ContentFinderByNiceUrl.TryFindContent(PublishedContentRequest docRequest)
   at Umbraco.Web.Routing.PublishedContentRequestEngine.<FindPublishedContent>b__17_0(IContentFinder finder)
   at System.Linq.Enumerable.Any[TSource](IEnumerable`1 source, Func`2 predicate)
   at Umbraco.Web.Routing.PublishedContentRequestEngine.FindPublishedContent()
   at Umbraco.Web.Routing.PublishedContentRequestEngine.TryRouteRequest()
   at Umbraco.Web.Routing.UrlProviderExtensions.GetContentUrls(IContent content, UmbracoContext umbracoContext)
   at Umbraco.Web.Models.Mapping.ContentModelMapper.ContentUrlResolver.Resolve(ResolutionResult source)
   at AutoMapper.DeferredInstantiatedResolver.Resolve(ResolutionResult source)
   at AutoMapper.PropertyMap.<ResolveValue>b__6(ResolutionResult current, IValueResolver resolver)
   at System.Linq.Enumerable.Aggregate[TSource,TAccumulate](IEnumerable`1 source, TAccumulate seed, Func`3 func)
   at AutoMapper.PropertyMap.ResolveValue(ResolutionContext context)
   at AutoMapper.Mappers.TypeMapObjectMapperRegistry.PropertyMapMappingStrategy.MapPropertyValue(ResolutionContext context, IMappingEngineRunner mapper, Object mappedObject, PropertyMap propertyMap)
   --- End of inner exception stack trace ---

When I disable property value converters then I can edit the same node and see picked image correctly.

So there is not available property converter for obsolete Media Picker in the core or there is any other problem I can fix?

Yes, I know that I can convert selected medias to UDI format but I have a lot of XSLT files which need media id for umbraco.library.GetMedia() extension. I'm trying to optimize jobs related to this Upgrade.