Fix #3941: Add ability to search users by inviter.

app/views/users/_statistics.html.erb

@@ -9,7 +9,11 @@
 
       <tr>
         <th>Inviter</th>
-        <td><%= presenter.inviter(self) %></td>
+        <% if user.inviter %>
+          <td><%= link_to_user user.inviter %> <%= link_to "»", users_path(search: { inviter: { name: user.inviter.name }}) %></td>
+        <% else %>
+          <td>None</td>
+        <% end %>
       </tr>
 
       <tr>

app/views/users/search.html.erb

@@ -2,6 +2,9 @@
   <div id="a-search">
     <%= simple_form_for(:search, url: users_path, method: :get, defaults: { required: false }, html: { class: "inline-form" }) do |f| %>
       <%= f.input :name_matches, label: "Name", hint: "Use * for wildcard", input_html: { value: params[:search][:name_matches] } %>
+      <%= f.simple_fields_for :inviter do |sub| %>
+        <%= sub.input :name_matches, label: "Inviter Name", hint: "Use * for wildcard", input_html: { value: params.dig(:search, :inviter, :name_matches) } %>
+      <% end %>
 
       <%= f.input :level, collection: User.level_hash.to_a, include_blank: true, selected: params[:search][:level] %>
       <%= f.input :min_level, collection: User.level_hash.to_a, include_blank: true, selected: params[:search][:min_level] %>