Support sass-rails 6. Fixes #3129

Appraisals

@@ -90,7 +90,7 @@ end
 
 appraise "rails-6.0" do
   gem 'rails', '~> 6.0.0.rc1'
-  gem 'sass-rails', '~> 5.0'
+  gem 'sass-rails', ['>= 6.0.0.beta3', '< 7']
   gem 'devise', '~> 4.4'
 
   group :test do

gemfiles/rails_6.0.gemfile

@@ -6,7 +6,7 @@ gem "appraisal", ">= 2.0"
 gem "rails", "~> 6.0.0.rc1"
 gem "haml"
 gem "devise", "~> 4.4"
-gem "sass-rails", "~> 5.0"
+gem "sass-rails", [">= 6.0.0.beta3", "< 7"]
 
 group :active_record do
   gem "paper_trail", ">= 5.0"

lib/rails_admin/bootstrap-sass.rb

@@ -17,8 +17,10 @@ def self.load!
         raise(Bootstrap::FrameworkNotFound.new('bootstrap-sass requires either Rails > 3.1 or Compass, neither of which are loaded'))
       end
 
-      stylesheets = File.expand_path(File.join('..', 'vendor', 'assets', 'stylesheets'))
-      ::Sass.load_paths << stylesheets
+      if defined?(::Sass) && ::Sass.respond_to?(:load_paths)
+        stylesheets = File.expand_path(File.join('..', 'vendor', 'assets', 'stylesheets'))
+        ::Sass.load_paths << stylesheets
+      end
     end
 
     def self.asset_pipeline?

lib/rails_admin/bootstrap-sass/sass_functions.rb

@@ -1,5 +1,3 @@
-require 'sass'
-
 module Sass
   module Script
     module Functions
@@ -12,7 +10,7 @@ def ie_hex_str(color)
         alphastr = alpha.to_s(16).rjust(2, '0')
         Sass::Script::String.new("##{alphastr}#{color.send(:hex_str)[1..-1]}".upcase)
       end
-      declare :ie_hex_str, [:color]
+      declare :ie_hex_str, [:color] if respond_to?(:declare)
     end
   end
 end

rails_admin.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'rack-pjax', '>= 0.7'
   spec.add_dependency 'rails', ['>= 5.0', '< 7']
   spec.add_dependency 'remotipart', '~> 1.3'
-  spec.add_dependency 'sass-rails', ['>= 4.0', '< 6']
+  spec.add_dependency 'sass-rails', ['>= 4.0', '< 7']
   spec.add_dependency 'activemodel-serializers-xml', '>= 1.0'
   spec.add_development_dependency 'bundler', '>= 1.0'
   spec.authors = ['Erik Michaels-Ober', 'Bogdan Gaza', 'Petteri Kaapa', 'Benoit Benezech', 'Mitsuhiro Shibuya']

spec/dummy_app/Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'rails', '~> 5.0'
+gem 'rails', '>= 6.0.0.beta'
 gem 'rack-cache', require: 'rack/cache'
 
 group :active_record do
@@ -14,12 +14,12 @@ group :active_record do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem 'mysql2', '~> 0.3.14'
+    gem 'mysql2', '>= 0.3.14'
     gem 'pg', '>= 0.14'
-    gem 'sqlite3', '~> 1.3.0'
+    gem 'sqlite3', '>= 1.3.0'
   end
 
-  gem 'paper_trail', '~> 5.0'
+  gem 'paper_trail', '>= 5.0'
 end
 
 group :mongoid do
@@ -37,15 +37,15 @@ gem 'mlb', '>= 0.7'
 gem 'paperclip', '>= 3.4'
 gem 'rails_admin', path: '../../'
 
-platforms :ruby_21, :ruby_22 do
+platforms :mri do
   # gem 'refile', '>= 0.5', require: 'refile/rails'
   # gem 'refile-mini_magick', '>= 0.1.0'
 end
 
 # Gems used only for assets and not required
 # in production environments by default.
 group :assets do
-  gem 'sass-rails', '>= 4.0.3'
+  gem 'sass-rails', '>= 6.0.0.beta'
   gem 'coffee-rails', '~> 4.0'
 
   # See https://github.com/sstephenson/execjs#readme for more supported runtimes