post votes: add index page.

app/models/post_vote.rb

@@ -23,6 +23,18 @@ class PostVote < ApplicationRecord
     select_values_sql("select post_id from post_votes where score > 0 and user_id = ?", user_id)
   end
 
+  def self.visible(user = CurrentUser.user)
+    return all if user.is_admin?
+    where(user: user)
+  end
+
+  def self.search(params)
+    q = super
+    q = q.visible
+    q = q.search_attributes(params, :post, :user, :score)
+    q.apply_default_order(params)
+  end
+
   def initialize_attributes
     self.user_id ||= CurrentUser.user.id