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Home / Developer Network / Forums / Sitefinity: Sitefinity SDK > Add Tags and Categories to Sitefinity then add it to a post is not working

• Peter

  Posted on Feb 1, 2012 (permalink)

  I need to add Tags and Categories to Sitefinity dynamiclly i'm using the following code
  
  For Categories
  

  var catTaxon = manager.GetTaxonomies<Telerik.Sitefinity.Taxonomies.Model.HierarchicalTaxonomy>().Where(query =>

                    String.Compare(query.Name, "Categories", true) == 0).FirstOrDefault();

  catTaxon.Taxa.Add(manager.GetTaxon<Telerik.Sitefinity.Taxonomies.Model.HierarchicalTaxon>(taxonomy.Id));

  
  
  and for Tags
  
  

  var tagTaxon = manager.GetTaxonomies<Telerik.Sitefinity.Taxonomies.Model.FlatTaxonomy>().Where(query =>

                      String.Compare(query.Name, "Tag", true) == 0).FirstOrDefault();

  tagTaxon.Taxa.Add(manager.GetTaxon<Telerik.Sitefinity.Taxonomies.Model.FlatTaxon>(taxonomy.Id));

   

  manager.SaveChanges();

  
  
  the taxonomy is the new item i need to add.
  
  and it gives me the following exception
  

  You are trying to access item that no longer exists. The most probable reason is that it has been deleted by another user.

  also the tags and categories i want to save , it is got saved under general classification.

  Reply

• Stanislav Velikov Stanislav Velikov

  Posted on Feb 6, 2012 (permalink)

  Hi,

   This is the API that will craete new taxa in categories taxonomy, the approach is relevant for Tags.

  var manager = TaxonomyManager.GetManager();

  //here take the CategoriesTaxonomyId, also you may take TagsTaxonomyId

              var CategoriesTaxonomy = manager.GetTaxonomy<HierarchicalTaxonomy>(TaxonomyManager.CategoriesTaxonomyId);

              var newDepartment = manager.CreateTaxon<HierarchicalTaxon>();

              newDepartment.Title = "From Europe";

              newDepartment.Name = "European ";

              newDepartment.Description = "This is Europe";

              CategoriesTaxonomy.Taxa.Add(newDepartment);

              manager.SaveChanges();

  The query is not construced to suit the purpose for Adding taxons to existing taxonomy and I suppose this is causing the exception.
  
  To Query the taxons use this API:
  

  TaxonomyManager manager = TaxonomyManager.GetManager();

  // p.Title gets the name of one new taxonomy

             var taxonomy = manager.GetTaxonomies<HierarchicalTaxonomy>().Where(p => p.Title == "Sports").OrderBy(r => "Ordinal").Single().Taxa.ToList();

  this will return a list of all taxonomies ordered as they are ordered in the backend of Sitefinity (Ordinal is the property).
  
  
  
  Greetings,
  Stanislav Velikov
  the Telerik team

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Reply

• Peter

  Posted on Feb 6, 2012 (permalink)

  Hi,
  thanks for your previous replay,
  i was able to save the tags and categories successfully.
  but the problem now is to link a post to a category or tag
  
  

  and below is the code that i use
  

  var manager = Telerik.Sitefinity.Taxonomies.TaxonomyManager.GetManager();

                  var taxon = manager.GetTaxa<Telerik.Sitefinity.Taxonomies.Model.HierarchicalTaxon>().Where(query =>

                      query.Name == category.Name).FirstOrDefault();

   

                  var blogPost = this._sitefinityAPI.BlogPosts().Where(query => query.Id == postId).First();

                  blogPost.CheckOut()

                      .Do(item =>

                      {

                          if (!item.Organizer.TaxonExists("Category", taxon.Id))

                              item.Organizer.TaxonExists("Category", taxon.Id);

                      })

                      .CheckIn()

                      .Publish()

                      .SaveChanges();

  
  it keep giving me null reference exception.

  Reply

• Stanislav Velikov Stanislav Velikov

  Posted on Feb 9, 2012 (permalink)

  Hello,

   Review how taxa is associated with Item here. Organized.Addtaxa can be called when creating a blog post or in a list
  

  BlogsManager blogsManager = BlogsManager.GetManager();

               

              BlogPost bb = blogsManager.CreateBlogPost();

              bb.Organizer.AddTaxa(...);

  
  So to add a tag to Blog post that is already created:
  

  var taxManager = TaxonomyManager.GetManager();

             var taxon = taxManager.GetTaxa<FlatTaxon>().Where(t => t.Name == "Book").Single();

             BlogsManager blogsManager = BlogsManager.GetManager();

             var myPost = blogsManager.GetBlogPosts().Where(d => d.Title == "Post1");

             foreach(var doc in myPost)

             {

                 doc.Organizer.AddTaxa("Tags", taxon.Id);

             }

             blogsManager.SaveChanges();

  
  
  

  All the best,
  Stanislav Velikov
  the Telerik team

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Reply

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