Use better method for querying moderation reports on posts and topics

- Also moved the control logic out of the views and into the models

app/models/post.rb

@@ -49,6 +49,7 @@ class Post < ApplicationRecord
   has_many :votes, :class_name => "PostVote", :dependent => :destroy
   has_many :notes, :dependent => :destroy
   has_many :comments, -> {order("comments.id")}, :dependent => :destroy
+  has_many :moderation_reports, through: :comments
   has_many :children, -> {order("posts.id")}, :class_name => "Post", :foreign_key => "parent_id"
   has_many :approvals, :class_name => "PostApproval", :dependent => :destroy
   has_many :disapprovals, :class_name => "PostDisapproval", :dependent => :destroy
@@ -1812,10 +1813,7 @@ class Post < ApplicationRecord
     save
   end
 
-  def moderation_reports
-    @moderation_reports ||= begin
-      comments_with_reports = comments.joins(:moderation_reports).includes(:moderation_reports).distinct
-      comments_with_reports.reduce([]) {|arr,comment| arr + comment.moderation_reports}
-    end
+  def viewable_moderation_reports
+    CurrentUser.is_moderator? ? moderation_reports : []
   end
 end