update to rails 6

Gemfile

@@ -1,10 +1,10 @@
 source 'http://rubygems.org'
 
 gem 'rails',        '>= 4.2'
+gem 'sass-rails',   '>= 6'
 gem 'turbolinks',   '>= 2'
 gem 'kaminari',     '>= 0'
 gem 'haml-rails',   '>= 0'
-gem 'sass-rails',   '>= 5'
 
 
 group :development do

app/controllers/bhf/entries_controller.rb

@@ -168,7 +168,7 @@ def load_new_object
     def manage_many_to_many
       return unless params[:has_and_belongs_to_many]
       params[:has_and_belongs_to_many].each_pair do |relation, ids|
-        next unless ids.any?
+        next unless ids.empty?
         reflection = @model.reflections[relation]
         relation_array = @object.send(relation)
         reflection.klass.unscoped.find(ids.keys).each do |relation_obj|
@@ -208,7 +208,7 @@ def manage_has_many
       return unless params[:has_many]
       object_id = @object.send(@model.bhf_primary_key)
       params[:has_many].each_pair do |relation, ids|
-        next unless ids.any?
+        next unless ids.empty?
         reflection = @model.reflections[relation]
         preset_ids = @object.send(relation).collect do |object|
           object.send(object.class.bhf_primary_key).to_s

lib/bhf.rb

@@ -1,5 +1,4 @@
 require 'haml'
-require 'sass'
 require 'turbolinks'
 require 'kaminari'
 
@@ -24,7 +23,7 @@ class Engine < Rails::Engine
     end
 
     initializer 'bhf.assets.precompile' do |app|
-      app.config.assets.precompile += %w( bhf/logo_bhf.svg )
+      app.config.assets.precompile += %w( bhf/application.css bhf/application.js bhf/logo_bhf.svg )
     end
   end