documents: add linked documents button

* Closes #3006.

Co-Authored-by: Bertrand Zuchuat <[email protected]>

rero_ils/modules/documents/templates/rero_ils/detailed_view_documents.html

@@ -226,6 +226,22 @@ <h3>
       {% endfor %}
       </div>
     {% endif %}
+
+    <!-- LINKED DOCUMENTS -->
+    {% if linked_documents_count > 0 %}
+      <a
+        class="btn btn-sm btn-outline-primary mt-3"
+        href="{{ url_for('rero_ils.search', viewcode=viewcode, recordType='documents', q='partOf.document.pid:' ~ record.pid, simple=0) }}"
+      >
+        <i class="fa fa-list" aria-hidden="true"></i>
+        {{ linked_documents_count }}
+        {% if linked_documents_count < 2 %}
+        {{ _('article/volume') }}
+        {% else %}
+        {{ _(' articles/volumes') }}
+        {% endif %}
+      </a>
+    {% endif %}
   </div>
 </div>
 

rero_ils/modules/documents/views.py

@@ -83,14 +83,24 @@ def doc_item_view_method(pid, record, template=None, **kwargs):
         query = query.filter('term', organisation__pid=organisation.pid)
     holdings_count = query.count()
 
+    # Counting linked documents
+    from .api import DocumentsSearch
+    query = DocumentsSearch()\
+        .filter('term', partOf__document__pid=pid.pid_value)
+    if organisation:
+        query = query.filter(
+            'term', holdings__organisation__organisation_pid=organisation.pid)
+    linked_documents_count = query.count()
+
     return render_template(
         template,
         pid=pid,
         record=record,
         holdings_count=holdings_count,
         viewcode=viewcode,
         recordType='documents',
-        current_patrons=current_patrons
+        current_patrons=current_patrons,
+        linked_documents_count=linked_documents_count
     )