Adds truncate_list template tag for long author lists in citables

metacore/models.py

@@ -54,8 +54,11 @@ class Citable(DynamicDocument):
     def times_cited(self):
         return []
 
-    def author_list(self):
-        return '; '.join(self.authors)
+    def author_list(self, max_n=None):
+        if max_n and max_n < len(self.authors):
+            return '; '.join(self.authors[:max_n]) + ' et al.'
+        else:
+            return '; '.join(self.authors)
 
     def crossref_ref_count(self):
         return self.metadata['is-referenced-by-count']

metacore/templates/partials/citable_card_content.html

+{% load metacore_extras %}
+
 <div class="submission_title">
     <!-- <h5 class="pb-0 subject_area">{{ submission.get_subject_area_display }}</h5> -->
     <h3 class="card-title mb-0 submisssion_title">
         {{ citable.title }}
     </h3>
-    <p class="mb-3 author_list">by {{ citable.author_list }}</p>
+    <p class="mb-3 author_list">by {{ citable.authors|truncate_list:10 }}</p>
 </div>
 
 {% block card_footer %}

metacore/templatetags/metacore_extras.py

+from django import template
+
+register = template.Library()
+
+@register.filter
+def truncate_list(authors, max_n):
+    """ Returns author list, truncated to max_n authors when the list is longer """
+    if max_n and max_n < len(authors):
+        return '; '.join(authors[:max_n]) + ' et al.'
+    else:
+        return '; '.join(authors)