Merge branch 'develop' of https://github.com/CLOSER-Cohorts/archivist …

…into develop

app/models/group.rb

@@ -1,11 +1,25 @@
+# Group representents a set of {User Users} that are interested in particular
+# studies
+#
+# === Properties
+# * group_type
+# * label
+# * study
 class Group < ApplicationRecord
+  # Each Group can have multiple {User Users}
   has_many :users
 
+  # Study can hold either a String or an Array, but is still stored in a single
+  # database column
   serialize :study
 
+  # Before saving clear study value
   before_save :remove_study_labelling
 
-  private
+  private # Private methods
+
+  # Incase more than just the study label is submitted extract the label for
+  # saving
   def remove_study_labelling
     if study.is_a? Array
       study.map! do |s|