Show related datasets on dataset page as a new tab.

Author: lmarini

app/controllers/Datasets.scala

@@ -632,11 +632,16 @@ class Datasets @Inject() (
         // increment view count for dataset
         val view_data = datasets.incrementViews(id, user)
 
+        // related datasets
+        val relatedThings = relations.findRelationships(dataset.id.stringify, ResourceType.dataset, ResourceType.dataset)
+        val relatedDatasets = for(r <- relatedThings) yield NodeDataset(datasets.get(UUID(r.target.id)).get, r.rdfType)
+
+
         // view_data is passed as tuple in dataset case only, because template is at limit of 22 parameters
         Ok(views.html.dataset(dataset, commentsByDataset, filteredPreviewers.toList, m,
           decodedCollectionsInside.toList, sensors, Some(decodedSpaces_canRemove), toPublish, curPubObjects,
           currentSpace, limit, showDownload, accessData, canAddDatasetToCollection,
-          stagingAreaDefined, view_data, extractionGroups))
+          stagingAreaDefined, view_data, extractionGroups, relatedDatasets))
       }
       case None => {
         Logger.error("Error getting dataset" + id)

app/models/Relation.scala

@@ -1,5 +1,7 @@
 package models
 
+import java.net.URL
+
 /**
  * Track relations between two arbitrary resources.
  */
@@ -10,10 +12,21 @@ case class Relation (
   rdfType: Option[String] = None // rdfType: Option[URI]
 )
 
+/**
+  * Source or sink node of a relationship.
+  *
+  * @param id a string so that it could be both a local UIUD as well as an external URL
+  * @param resourceType internal resource type (dataset, file, etc.)
+  */
 case class Node (
   id: String,
   resourceType: ResourceType.Value
 )
 
+case class NodeDataset(dataset: Dataset, rdfType: Option[String])
+
+case class NodeFile(file: File, rdfType: Option[String])
+
+case class NodeURL(url: URL, rdfType: Option[String])
 
 

app/views/dataset.scala.html

@@ -14,7 +14,8 @@
   canAddDatasetToCollection: Boolean,
   stagingAreaDefined: Boolean,
   view: (Int, java.util.Date),
-  extractionsStatus: Map[String, ExtractionGroup]
+  extractionsStatus: Map[String, ExtractionGroup],
+  relatedDataset: List[NodeDataset]
 )(implicit flash: play.api.mvc.Flash, user: Option[models.User], request: RequestHeader)
 
 @import api.Permission
@@ -272,6 +273,9 @@ <h4 class="modal-title" id="folder-modal-label">  @Messages("create.header", "Fo
                     <li role="presentation"><a href="#tab-extractions" role="tab" data-toggle="tab">Extractions </a></li>
                     <li role="presentation"><a href="#tab-visua" role="tab" data-toggle="tab">Visualizations</a></li>
                     <li role="presentation"><a href="#tab-comments" role="tab" data-toggle="tab">Comments (@comments.size)</a></li>
+                    @if(relatedDataset.size > 0) {
+                        <li role="relation"><a href="#tab-relations" role="tab" data-toggle="tab">Related</a></li>
+                    }
                 </ul>
                 <div class="tab-content">
                     <div role="tabpanel" class="tab-pane fade in active" id="tab-files">
@@ -311,6 +315,11 @@ <h4 class="modal-title" id="folder-modal-label">  @Messages("create.header", "Fo
                     <div role="tabpanel" class="tab-pane fade" id="tab-visua">
                         @datasets.previews(dataset, previewers)
                     </div>
+                    @if(relatedDataset.size > 0) {
+                        <div role="tabpanel" class="tab-pane fade" id="tab-relations">
+                        @relations.list(relatedDataset)
+                        </div>
+                    }
                     <div class="row bottom-padding">
                         <div class="col-md-12">
                         </div>

app/views/relations/list.scala.html

@@ -0,0 +1,18 @@
+@(relatedDatasets: List[NodeDataset])
+
+<table class="table table-condensed">
+    <thead>
+        <th>Relationship Type</th>
+        <th>Target Dataset</th>
+    </thead>
+    <tbody>
+        @for(rd <- relatedDatasets) {
+            <tr>
+                <td>@rd.rdfType.getOrElse("Generic relation")</td>
+                <td><a href="@routes.Datasets.dataset(rd.dataset.id)">@rd.dataset.name</a></td></tr>
+        }
+    </tbody>
+</table>
+
+
+