post votes: let gold users use upvote:self, downvote:self metatags.

* Let gold users use upvote:self, downvote:self metatags to search for
  their own votes.
* Don't let mods use upvote:<user>, downvote:<user> metatags to see
  votes by other users. Only let admins see other users' votes.
* Add vote count to profile page.

app/logical/post_query_builder.rb

@@ -473,14 +473,12 @@ class PostQueryBuilder
     end
 
     if q[:upvote].present?
-      user_id = q[:upvote]
+      post_ids = PostVote.where(user: q[:upvote]).where("score > 0").select(:post_id)
-      post_ids = PostVote.where(:user_id => user_id).where("score > 0").limit(400).pluck(:post_id)
       relation = relation.where("posts.id": post_ids)
     end
 
     if q[:downvote].present?
-      user_id = q[:downvote]
+      post_ids = PostVote.where(user: q[:downvote]).where("score < 0").select(:post_id)
-      post_ids = PostVote.where(:user_id => user_id).where("score < 0").limit(400).pluck(:post_id)
       relation = relation.where("posts.id": post_ids)
     end
 

app/models/tag.rb

@@ -774,13 +774,17 @@ class Tag < ApplicationRecord
             end
 
           when "upvote"
-            if CurrentUser.user.is_moderator?
+            if CurrentUser.user.is_admin?
-              q[:upvote] = User.name_to_id(g2)
+              q[:upvote] = User.find_by_name(g2)
+            elsif CurrentUser.user.is_voter?
+              q[:upvote] = CurrentUser.user
             end
 
           when "downvote"
-            if CurrentUser.user.is_moderator?
+            if CurrentUser.user.is_admin?
-              q[:downvote] = User.name_to_id(g2)
+              q[:downvote] = User.find_by_name(g2)
+            elsif CurrentUser.user.is_voter?
+              q[:downvote] = CurrentUser.user
             end
 
           when *COUNT_METATAGS

app/views/users/_statistics.html.erb

@@ -85,6 +85,15 @@
         </td>
       </tr>
 
+      <% if CurrentUser.user == user || CurrentUser.user.is_admin? %>
+        <tr>
+          <th>Post Votes</th>
+          <td>
+            <%= link_to user.post_votes.count, post_votes_path(search: { user_name: user.name }) %>
+          </td>
+        </tr>
+      <% end %>
+
       <tr>
         <th>Favorite Groups</th>
         <td><%= presenter.favorite_group_count(self) %></td>