From 2554c08428339507bac493db995bcfc451df56a6 Mon Sep 17 00:00:00 2001
From: Ben Silverman <ben@performantsoftware.com>
Date: Tue, 5 Dec 2023 14:50:00 -0500
Subject: [PATCH] Add external links and seeAlso to sidebar (#959)

---
 apps/iiif/manifests/models.py | 21 +++++++++++++++++++++
 apps/templates/page.html      | 19 +++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/apps/iiif/manifests/models.py b/apps/iiif/manifests/models.py
index 31c71600..20cb85d0 100644
--- a/apps/iiif/manifests/models.py
+++ b/apps/iiif/manifests/models.py
@@ -272,6 +272,27 @@ def related_links(self):
         })
         return links
 
+    @property
+    def external_links(self):
+        """Dict of lists of external links for display on volume pages
+        
+        :return: Dict of external links ("related" and "seeAlso")
+        :rtype: dict
+        """
+        related_links = self.relatedlink_set.all()
+        return {
+            "see_also": [
+                link.link
+                for link in related_links
+                if link.data_type.lower() == "dataset"
+            ],
+            "related": [
+                link.link
+                for link in related_links
+                if link.data_type.lower() != "dataset"
+            ],
+        }
+
     @property
     def see_also_links(self):
         """List of links for IIIF v2 'seeAlso' field (structured data).
diff --git a/apps/templates/page.html b/apps/templates/page.html
index 9df5932b..b07f083b 100644
--- a/apps/templates/page.html
+++ b/apps/templates/page.html
@@ -430,6 +430,25 @@ <h2 class="uk-modal-title">Text</h2>
           <v-info-content-url-external label="Stable Page" volume="{% url 'volume' volume.pid %}" url="https://{{ request.META.HTTP_HOST }}{% url 'volume' volume.pid %}/page/{{ page.pid }}">
           </v-info-content-url-external>
         {% endif %}
+
+        {% if volume.external_links.see_also %}
+          <v-info-content-url-multiple label="See Also">
+            {% for link in volume.external_links.see_also %}
+              <v-info-content-url-unit url="{{ link }}">
+              </v-info-content-url-unit>
+            {% endfor %}
+          </v-info-content-url-multiple>
+        {% endif %}
+
+        {% if volume.external_links.related %}
+          <v-info-content-url-multiple label="External Links">
+            {% for link in volume.external_links.related %}
+              <v-info-content-url-unit url="{{ link }}">
+              </v-info-content-url-unit>
+            {% endfor %}
+          </v-info-content-url-multiple>
+        {% endif %}
+
       </div>
     </div>