Creating a list of keywords in the Content Delivery - tridion

Question

Imagine I have a content type that has two fields of type category: one is a taxonomy Author and another one is a taxonomy Topics, these two taxonomies are unrelated, the only 'thing' they may have in common is the component itself.
Now we go to the website as a visitor, then when the visitor clicks on a given Author I want to create a list with all the Topics that are present in Components that also contain the specific Author.
I know I could create a query object with a criteria containing both keywords from the different taxonomies to check if it retrieves any values, the problem is that I would need to do that for every single topic i.e. Author and Topic1, Author and Topic2, Author and Topic 3 etc, in the end it may mean tens of queries which I obviously don't want to do.
As I see it the taxonomy API won't help because both taxonomies and thefore their keywords are completely unrelated. Any alternatives?

Answer 1

If I understand your requirement correctly, you could get this using the combination of CategoryCriteria and KeywordCriteria.
CategoryCriteria to specify which category the content tagged to in this case Topics.
KeywordCriteria to specify which category key value (e.g.; Author=Chris ).
PublicationCriteria pubCriteria = new PublicationCriteria(59); // publication scope
CategoryCriteria categoryCriteria = new CategoryCriteria("Topics");
KeywordCriteria taxonomyKeywordCriteria = new KeywordCriteria("Author", "Chris");
Criteria allCriteria = CriteriaFactory.And(
new Criteria[] { pubCriteria,
CriteriaFactory.And(new Criteria[] { categoryCriteria, taxonomyKeywordCriteria }) }
);
Query allComps = new Query(allCriteria);
string[] compIDs = allComps.ExecuteQuery();
Response.Write("<br /> Legth : " + compIDs.Length );

Answer 2

I believe you will need to make 2 KeywordCriteria
Criteria #1: Author = "Chris"
Criteria #2: Topic = "Topic1" or "Topic2" or "Topic3"
Then create a new AND criteria to combine the two
Hope that helps, please specify if you are using .NET or Java if you need some examples
Chris

Answer 3

So you want to find all components that are tagged with a specific author and then find the corresponding Topic keyword relations of the found components?
The TaxonomyRelationManager should be able to help you here:
TaxonomyRelationManager manager = new TaxonomyRelationManager();
string[] contentWithThisAuthor = manager.GetTaxonomyContent(new Keyword(taxonomyUriOfAuthors, authorUri), false);
Keyword[] relatedTopics = manager.GetTaxonomyKeywords(taxonomyUriOfTopics, contentWithThisAuthor, new Keyword[] {}, null, 16);

Answer 4

Based on the comment by Ram G and therefore taking as starting point the code example in live content, I have verified that the following solution works:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Tridion.ContentDelivery.Taxonomies;
using Tridion.ContentDelivery.DynamicContent.Query;
using Tridion.ContentDelivery.DynamicContent;
namespace Asier.Web.UI
{
public class TagCloud : System.Web.UI.WebControls.WebControl
{
protected override void Render(HtmlTextWriter writer)
{
TaxonomyRelationManager relationManager = new TaxonomyRelationManager();
TaxonomyFactory taxFactory = new TaxonomyFactory();
string taxonomyUriWhichIWantTheKeywordsFrom = "tcm:69-265-512";
String[] componentUris = GetComponentUris();
String[] contextKeywordUris = GetKeywordUris();
Keyword[] contextKeywordArray = GetKeywordsFromKeywordUris(taxFactory, contextKeywordUris);
Keyword[] cloudFacets = relationManager.GetTaxonomyKeywords(taxonomyUriWhichIWantTheKeywordsFrom, componentUris, contextKeywordArray, new CompositeFilter(), 16);
ProcessKeywords(cloudFacets);
}
private static string[] GetComponentUris()
{
// This should probably be replaced with a Query object that
// retrieves the URIs dynamically
return new String[] { "tcm:69-3645-16", "tcm:69-3648-16", "tcm:69-3651-16" };
}
private static string[] GetKeywordUris()
{
// this should probably be passed in as a property of the control
return new string[] { "tcm:69-3078-1024" };
}
private static Keyword[] GetKeywordsFromKeywordUris(TaxonomyFactory taxFactory, String[] contextKeywordUris)
{
Keyword[] contextKeywordArray = new Keyword[contextKeywordUris.Length];
for (int i = 0; i < contextKeywordUris.Length; i++)
{
contextKeywordArray[i] = taxFactory.GetTaxonomyKeyword(contextKeywordUris[i]);
}
return contextKeywordArray;
}
private static void ProcessKeywords(Keyword[] cloudFacets)
{
for (int i = 0; i < cloudFacets.GetLength(0); i++)
{
if (cloudFacets[i].ReferencedContentCount > 0)
{
// Do whatever...
}
}
}
}
}

Answer 5

For creating the query object, take help of a component.
In the component, add these categories in seperate fields :
Topic (ListBox, with Multiple Selection)
Author (Dropdown, with single selection...or as desired).
In your case, select all the listbox options for Topic.
Suppose you have 3 keywords viz Topic 1,Topic 2,Topic 3.
So that keywords would be formed as:
KeywordCriteria topicCriteria1= new KeywordCriteria("Topic","Topic 1");
KeywordCriteria topicCriteria2= new KeywordCriteria("Topic","Topic 2");
KeywordCriteria topicCriteria3= new KeywordCriteria("Topic","Topic 3");
Criteria[] topicCriterias = {topicCriteria1,topicCriteria2,topicCriteria3};
Criteria OrCriteria = CriteriaFactory.Or(topicCriterias);
//Create Author Criteria
KeywordCriteria AuthorCriteria= new KeywordCriteria("Author","Author 1");
//And both results
mainCriteria =CriteriaFactory.And(AuthorCriteria, topicCriterias);
//Query
query.Criteria=mainCriteria;
For selecting all the Keywords related to topic, you can write a method instead of writting individually.
Hope this helps.