Add consumer-based RfC Visibility settings

This setting will be useful to increase data protection, where users might not be allowed to see RfCs from other contexts.

app/models/consumer.rb

@@ -1,6 +1,12 @@
 # frozen_string_literal: true
 
 class Consumer < ApplicationRecord
+  enum rfc_visibility: {
+    all: 0,
+    consumer: 1,
+    study_group: 2,
+  }, _default: :all, _prefix: true
+
   has_many :users
   has_many :study_groups, dependent: :destroy
 

app/models/request_for_comment.rb

@@ -88,7 +88,20 @@ class RequestForComment < ApplicationRecord
     private
 
     def row_number_user_sql
-      select('id, user_id, user_type, exercise_id, file_id, question, created_at, updated_at, solved, full_score_reached, submission_id, row_number() OVER (PARTITION BY user_id, user_type ORDER BY created_at DESC) as row_number')
+      select('
+        request_for_comments.id,
+        request_for_comments.user_id,
+        request_for_comments.user_type,
+        request_for_comments.exercise_id,
+        request_for_comments.file_id,
+        request_for_comments.question,
+        request_for_comments.created_at,
+        request_for_comments.updated_at,
+        request_for_comments.solved,
+        request_for_comments.full_score_reached,
+        request_for_comments.submission_id,
+        row_number() OVER (PARTITION BY request_for_comments.user_id, request_for_comments.user_type ORDER BY request_for_comments.created_at DESC) as row_number
+      ')
     end
   end
 end