Issue-15713: Fix creating Culture and LocalizationSet for contents cr…

…eated via Graph API. (#15714)

src/OrchardCore.Modules/OrchardCore.ContentLocalization/Handlers/LocalizationPartHandler.cs

@@ -4,18 +4,44 @@
 using OrchardCore.ContentLocalization.Services;
 using OrchardCore.ContentManagement;
 using OrchardCore.ContentManagement.Handlers;
+using OrchardCore.Entities;
+using OrchardCore.Localization;
 
 namespace OrchardCore.ContentLocalization.Handlers
 {
  public class LocalizationPartHandler : ContentPartHandler<LocalizationPart>
  {
  private readonly ILocalizationEntries _entries;
+ private readonly IIdGenerator _idGenerator;
+ private readonly ILocalizationService _localizationService;
 
- public LocalizationPartHandler(ILocalizationEntries entries)
+ public LocalizationPartHandler(
+ ILocalizationEntries entries,
+ IIdGenerator idGenerator,
+ ILocalizationService localizationService)
  {
  _entries = entries;
+ _idGenerator = idGenerator;
+ _localizationService = localizationService;
  }
 
+ public override async Task CreatingAsync(CreateContentContext context, LocalizationPart part)
+ {
+ if (string.IsNullOrEmpty(part.LocalizationSet))
+ {
+ context.ContentItem.Alter<LocalizationPart>(p => 
+ p.LocalizationSet = _idGenerator.GenerateUniqueId()
+ );
+ }
+
+ if (string.IsNullOrEmpty(part.Culture))
+ {
+ await context.ContentItem.AlterAsync<LocalizationPart>(async p => 
+ p.Culture = await _localizationService.GetDefaultCultureAsync()
+ );
+ }
+ }
+
  public override Task GetContentItemAspectAsync(ContentItemAspectContext context, LocalizationPart part)
  {
  return context.ForAsync<CultureAspect>(cultureAspect =>