Fix study_group index page

app/models/study_group.rb

@@ -19,4 +19,12 @@ class StudyGroup < ApplicationRecord
   def to_s
     name.presence || "StudyGroup #{id}"
   end
+
+  def self.ransackable_attributes(_auth_object = nil)
+    %w[name]
+  end
+
+  def self.ransackable_associations(_auth_object = nil)
+    %w[consumer]
+  end
 end