Changes to get trestle auth plugin work with Administrator < Sequel::Model

sequel-trestle-auth.diff

Index: app/helpers/trestle/auth/user_helper.rb
   def avatar_for(user)
-    avatar { instance_exec(user, &Trestle.config.auth.avatar) } if Trestle.config.auth.avatar
+    Trestle::ApplicationController.helpers.avatar { instance_exec(user, &Trestle.config.auth.avatar) } if Trestle.config.auth.avatar
   end
 end

Index: app/views/trestle/auth/_userbox.html.erb
 <div class="userbox pull-right dropdown">
   <%= link_to "#", class: 'dropdown-toggle', data: { toggle: 'dropdown' } do %>
     <span class="name">
-      <%= format_user_name(current_user) %>
+      <%= ApplicationController.helpers.format_user_name(current_user) %>
       <span class="caret"></span>
     </span>
 
-    <%= avatar_for(current_user) %>
+    <%= ApplicationController.helpers.avatar_for(current_user) %>
   <% end %>
 
   <ul class="dropdown-menu dropdown-menu-right">

Index: lib/trestle/auth/configuration.rb
       }
 
       option :avatar, ->(user) {
-        gravatar(user.email)
+        ApplicationController.helpers.gravatar(user.email)
       }, evaluate: false
 
       option :locale, ->(user) {

Index: lib/trestle/auth/controller_methods.rb
       def current_user
         @current_user ||= begin
           if session[:trestle_user]
-            Trestle.config.auth.user_scope.find_by(id: session[:trestle_user])
+            Trestle.config.auth.user_scope.find(id: session[:trestle_user])
           elsif Trestle.config.auth.remember.enabled && token = cookies.signed[:trestle_remember_token]
             user = Trestle.config.auth.remember.authenticate(token)
             login!(user) if user

Index: lib/trestle/auth/model_methods.rb
       module ClassMethods
         def authenticate(identifier, password)
-          user = find_by(Trestle.config.auth.authenticate_with => identifier) || NullUser.new
+          user = find(Trestle.config.auth.authenticate_with => identifier) || NullUser.new
           user.authenticate(password)
         end
       end

in addition i had to add this sequel plugin https://github.com/mlen/sequel_secure_password to my application (and init it for Administrator model with plugin :secure_password) and define empty has_secure_password class method (to eliminate trestle-auth's NoMethodError exception)

i think, it better has to be managed at trestle-auth plugin side