move mongoid support to a separate gem

Gemfile

@@ -40,14 +40,6 @@ else
   end
 end
 
-if ENV['DB'] =~ /mongoid4/
-  gem 'mongoid', '~> 4.0.0', require: false
-end
-
-if ENV['DB'] =~ /mongoid5/
-  gem 'mongoid', '~> 5.0.0', require: false
-end
-
 group :test do
   # TestUnit was removed from Ruby 2.2 but still needed for testing Rails 3.x.
   gem 'test-unit', '~> 3.0' if RUBY_VERSION >= '2.2'

README.md

@@ -875,6 +875,7 @@ en:
 
 ## Mongoid
 
+Mongoid support has been moved to its own gem at [ransack-mongoid](github.com/activerecord-hackery/ransack-mongoid).
 Ransack works with Mongoid in the same way as Active Record, except that with
 Mongoid, associations are not currently supported. Demo source code may be found
 [here](https://github.com/Zhomart/ransack-mongodb-demo). A `result` method

Rakefile

@@ -11,17 +11,8 @@ RSpec::Core::RakeTask.new(:spec) do |rspec|
   # rspec.rspec_opts = ['--backtrace']
 end
 
-RSpec::Core::RakeTask.new(:mongoid) do |rspec|
-  ENV['SPEC'] = 'spec/mongoid/**/*_spec.rb'
-  rspec.rspec_opts = ['--backtrace']
-end
-
 task :default do
-  if ENV['DB'] =~ /mongoid/
-    Rake::Task["mongoid"].invoke
-  else
-    Rake::Task["spec"].invoke
-  end
+  Rake::Task["spec"].invoke
 end
 
 desc "Open an irb session with Ransack and the sample data used in specs"
@@ -31,15 +22,3 @@ task :console do
   ARGV.clear
   Pry.start
 end
-
-desc "Open an irb session with Ransack, Mongoid and the sample data used in specs"
-task :mongoid_console do
-  require 'irb'
-  require 'irb/completion'
-  require 'pry'
-  require 'mongoid'
-  require File.expand_path('../lib/ransack.rb', __FILE__)
-  require File.expand_path('../spec/mongoid/support/schema.rb', __FILE__)
-  ARGV.clear
-  Pry.start
-end