diff --git a/.travis.yml b/.travis.yml
index 59203ba..7eab2c3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,6 +19,7 @@ gemfile:
   - gemfiles/rails_4.0.gemfile
   - gemfiles/rails_4.0_mongo_mapper.gemfile
   - gemfiles/rails_4.2.gemfile
+  - gemfiles/rails_4.2_mongoid_4.gemfile
   - gemfiles/rails_4.2_mongoid_5.gemfile
   - gemfiles/rails_4.2_mongo_mapper.gemfile
   - gemfiles/rails_5.0.gemfile
@@ -35,12 +36,20 @@ matrix:
     - rvm: rbx-2.5.8
       gemfile: gemfiles/rails_5.0.gemfile
   exclude:
+    - rvm: 1.9.3
+      gemfile: gemfiles/rails_4.2_mongoid_4.gemfile
+    - rvm: 1.9.3
+      gemfile: gemfiles/rails_4.2_mongoid_5.gemfile
     - rvm: 1.9.3
       gemfile: gemfiles/rails_5.0.gemfile
     - rvm: 2.2.5
       gemfile: gemfiles/rails_3.2_stable.gemfile
     - rvm: 2.3.1
       gemfile: gemfiles/rails_3.2_stable.gemfile
+    - rvm: jruby-1.7
+      gemfile: gemfiles/rails_4.2_mongoid_4.gemfile
+    - rvm: jruby-1.7
+      gemfile: gemfiles/rails_4.2_mongoid_5.gemfile
     - rvm: jruby-1.7
       gemfile: gemfiles/rails_5.0.gemfile
 
diff --git a/Appraisals b/Appraisals
new file mode 100644
index 0000000..2b32e3d
--- /dev/null
+++ b/Appraisals
@@ -0,0 +1,117 @@
+appraise 'rails_3.2_stable' do
+  gem 'sqlite3',                          :platforms => :ruby
+  gem 'rubysl',                           :platforms => :rbx
+  gem 'rubinius-developer_tools',         :platforms => :rbx
+  gem 'jruby-openssl',                    :platforms => :jruby
+  gem 'activerecord-jdbcsqlite3-adapter', :platforms => :jruby
+  gem 'rails', :github => 'rails/rails',  :branch => '3-2-stable'
+  gem 'mongoid', '~>3.1'
+  gem 'sequel'
+  gem 'mongo_mapper', '~>0.13'
+  gem 'bson_ext',                         :platforms => :ruby
+  gem 'test-unit', '~> 3.0'
+end
+
+appraise 'rails_4.0' do
+  gem 'sqlite3',                          :platforms => :ruby
+  gem 'rubysl',                           :platforms => :rbx
+  gem 'rubinius-developer_tools',         :platforms => :rbx
+  gem 'jruby-openssl',                    :platforms => :jruby
+  gem 'activerecord-jdbcsqlite3-adapter', :platforms => :jruby
+  gem 'mime-types', '~> 2',               :platforms => [:ruby_19, :jruby]
+  gem 'rails', '4.0.13'
+  gem 'mongoid', '~>4.0'
+  gem 'sequel'
+  gem 'dynamoid', '~> 1',                 :platforms => :ruby
+  gem 'aws-sdk', '~>2',                   :platforms => :ruby
+  gem 'redis-objects'
+end
+
+appraise 'rails_4.0_mongo_mapper' do
+  gem 'sqlite3',                          :platforms => :ruby
+  gem 'rubysl',                           :platforms => :rbx
+  gem 'rubinius-developer_tools',         :platforms => :rbx
+  gem 'jruby-openssl',                    :platforms => :jruby
+  gem 'activerecord-jdbcsqlite3-adapter', :platforms => :jruby
+  gem 'mime-types', '~> 2',               :platforms => [:ruby_19, :jruby]
+  gem 'rails', '4.0.13'
+  gem 'sequel'
+  gem 'mongo_mapper', '~>0.13.1'
+  gem 'bson_ext',                         :platforms => :ruby
+  gem 'dynamoid', '~> 1',                 :platforms => :ruby
+  gem 'aws-sdk', '~>2',                   :platforms => :ruby
+end
+
+appraise 'rails_4.2' do
+  gem 'sqlite3',                          :platforms => :ruby
+  gem 'rubysl',                           :platforms => :rbx
+  gem 'rubinius-developer_tools',         :platforms => :rbx
+  gem 'jruby-openssl',                    :platforms => :jruby
+  gem 'activerecord-jdbcsqlite3-adapter', :platforms => :jruby
+  gem 'mime-types', '~> 2',               :platforms => [:ruby_19, :jruby]
+  gem 'rails', '4.2.5'
+  gem 'sequel'
+  gem 'dynamoid', '~> 1',                 :platforms => :ruby
+  gem 'aws-sdk', '~>2',                   :platforms => :ruby
+end
+
+appraise 'rails_4.2_mongoid_4' do
+  gem 'sqlite3',                          :platforms => :ruby
+  gem 'rubysl',                           :platforms => :rbx
+  gem 'rubinius-developer_tools',         :platforms => :rbx
+  gem 'jruby-openssl',                    :platforms => :jruby
+  gem 'activerecord-jdbcsqlite3-adapter', :platforms => :jruby
+  gem 'mime-types', '~> 2',               :platforms => [:ruby_19, :jruby]
+  gem 'rails', '4.2.5'
+  gem 'mongoid', '~>4.0',                 :platforms => [:ruby_22, :ruby_23, :jruby]
+  gem 'sequel'
+  gem 'dynamoid', '~> 1',                 :platforms => :ruby
+  gem 'aws-sdk', '~>2',                   :platforms => :ruby
+end
+
+appraise 'rails_4.2_mongoid_5' do
+  gem 'sqlite3',                          :platforms => :ruby
+  gem 'rubysl',                           :platforms => :rbx
+  gem 'rubinius-developer_tools',         :platforms => :rbx
+  gem 'jruby-openssl',                    :platforms => :jruby
+  gem 'activerecord-jdbcsqlite3-adapter', :platforms => :jruby
+  gem 'mime-types', '~> 2',               :platforms => [:ruby_19, :jruby]
+  gem 'rails', '4.2.5'
+  gem 'mongoid', '~>5.0',                 :platforms => [:ruby_22, :ruby_23, :jruby]
+  gem 'sequel'
+  gem 'dynamoid', '~> 1',                 :platforms => :ruby
+  gem 'aws-sdk', '~>2',                   :platforms => :ruby
+end
+
+appraise 'rails_4.2_mongo_mapper' do
+  gem 'sqlite3',                          :platforms => :ruby
+  gem 'rubysl',                           :platforms => :rbx
+  gem 'rubinius-developer_tools',         :platforms => :rbx
+  gem 'jruby-openssl',                    :platforms => :jruby
+  gem 'activerecord-jdbcsqlite3-adapter', :platforms => :jruby
+  gem 'mime-types', '~> 2',               :platforms => [:ruby_19, :jruby]
+  gem 'rails', '4.2.5'
+  gem 'sequel'
+  gem 'mongo_mapper'
+  gem 'bson_ext',                         :platforms => :ruby
+  gem 'dynamoid', '~> 1',                 :platforms => :ruby
+  gem 'aws-sdk', '~>2',                   :platforms => :ruby
+  gem 'redis-objects'
+end
+
+appraise 'rails_5.0' do
+  gem 'sqlite3',                          :platforms => :ruby
+  gem 'rubysl',                           :platforms => :rbx
+  gem 'rubinius-developer_tools',         :platforms => :rbx
+  gem 'jruby-openssl',                    :platforms => :jruby
+  gem 'activerecord-jdbcsqlite3-adapter', :platforms => :jruby
+  gem 'rails', '5.0.0'
+  # mongoid is not yet Rails 5 compatible
+  # gem 'mongoid', '~>4.0',                 :platforms => [:ruby_22, :ruby_23, :jruby]
+  gem 'sequel'
+
+  # dynamoid is not yet Rails 5 compatible
+  # gem 'dynamoid', '~> 1',                 :platforms => :ruby
+
+  gem 'aws-sdk', '~>2',                   :platforms => :ruby
+end
diff --git a/Gemfile b/Gemfile
index 46eb0b4..b4e2a20 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,24 +1,3 @@
 source "https://rubygems.org"
 
-gem "sqlite3",                          :platforms => :ruby
-gem 'rubysl',                           :platforms => :rbx
-gem "jruby-openssl",                    :platforms => :jruby
-gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
-gem "rails", ">= 4.2", "< 6"
-gem 'mongoid', '~>4.0' if Gem::Version.create(RUBY_VERSION.dup) >= Gem::Version.create('1.9.3')
-gem 'sequel'
-
-# testing dynamoid
-# gem 'dynamoid', '~> 1'
-# gem 'aws-sdk', '~>2'
-
-# Since mongoid V4 requires incompatible bson V2, cannot have mongoid (V4 or greater)
-# and mongo_mapper ( or mongo ) in the same application
-# gem 'mongo_mapper', '~> 0.13'
-# gem 'bson_ext',                          :platforms => :ruby
-
-# uncomment if you want to run specs for Redis persistence
-# gem "redis-objects"
-
 gemspec
diff --git a/Rakefile b/Rakefile
index 83089eb..fb8a83c 100644
--- a/Rakefile
+++ b/Rakefile
@@ -23,4 +23,9 @@ Rake::RDocTask.new do |rdoc|
   rdoc.rdoc_files.include('lib/**/*.rb')
 end
 
-task :default => :spec
+if ENV["APPRAISAL_INITIALIZED"] || ENV["TRAVIS"]
+  task :default => :spec
+else
+  require 'appraisal'
+  task :default => :appraisal
+end
diff --git a/TESTING.md b/TESTING.md
new file mode 100644
index 0000000..3812790
--- /dev/null
+++ b/TESTING.md
@@ -0,0 +1,17 @@
+## Install dependency matrix
+
+    appraise install
+
+This will re-generate Gemfiles in `gemfile` folder
+
+Use rvm gemsets or similar to avoid global gem pollution
+
+## Run specs
+
+For all supported Rails/ORM combinations:
+
+    appraise rspec
+
+Or for s specific one:
+
+    appraise rails_4.2 rspec
diff --git a/aasm.gemspec b/aasm.gemspec
index 5e49fc6..e08307a 100644
--- a/aasm.gemspec
+++ b/aasm.gemspec
@@ -20,6 +20,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'sdoc'
   s.add_development_dependency 'rspec', ">= 3"
   s.add_development_dependency 'generator_spec'
+  s.add_development_dependency 'appraisal'
 
   # debugging
   # s.add_development_dependency 'debugger'
diff --git a/gemfiles/rails_3.2_stable.gemfile b/gemfiles/rails_3.2_stable.gemfile
index 946afb6..c2afda1 100644
--- a/gemfiles/rails_3.2_stable.gemfile
+++ b/gemfiles/rails_3.2_stable.gemfile
@@ -1,15 +1,17 @@
+# This file was generated by Appraisal
+
 source "https://rubygems.org"
 
-gem "sqlite3",                          :platforms => :ruby
-gem 'rubysl',                           :platforms => :rbx
-gem 'rubinius-developer_tools',         :platforms => :rbx
-gem "jruby-openssl",                    :platforms => :jruby
+gem "sqlite3", :platforms => :ruby
+gem "rubysl", :platforms => :rbx
+gem "rubinius-developer_tools", :platforms => :rbx
+gem "jruby-openssl", :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-gem "rails", :github => "rails/rails",  :branch => "3-2-stable"
-gem 'mongoid', '~>3.1' if Gem::Version.create(RUBY_VERSION.dup) >= Gem::Version.create('1.9.3')
-gem 'sequel'
-gem 'mongo_mapper', '~>0.13'
-gem 'bson_ext',                          :platforms => :ruby
-gem 'test-unit', '~> 3.0'
+gem "rails", :github => "rails/rails", :branch => "3-2-stable"
+gem "mongoid", "~>3.1"
+gem "sequel"
+gem "mongo_mapper", "~>0.13"
+gem "bson_ext", :platforms => :ruby
+gem "test-unit", "~> 3.0"
 
 gemspec :path => "../"
diff --git a/gemfiles/rails_4.0.gemfile b/gemfiles/rails_4.0.gemfile
index c5c87eb..6609c3a 100644
--- a/gemfiles/rails_4.0.gemfile
+++ b/gemfiles/rails_4.0.gemfile
@@ -1,16 +1,18 @@
+# This file was generated by Appraisal
+
 source "https://rubygems.org"
 
-gem "sqlite3",                          :platforms => :ruby
-gem 'rubysl',                           :platforms => :rbx
-gem 'rubinius-developer_tools',         :platforms => :rbx
-gem "jruby-openssl",                    :platforms => :jruby
+gem "sqlite3", :platforms => :ruby
+gem "rubysl", :platforms => :rbx
+gem "rubinius-developer_tools", :platforms => :rbx
+gem "jruby-openssl", :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
+gem "mime-types", "~> 2", :platforms => [:ruby_19, :jruby]
 gem "rails", "4.0.13"
-gem 'mongoid', '~>4.0' if Gem::Version.create(RUBY_VERSION.dup) >= Gem::Version.create('1.9.3')
-gem 'sequel'
-gem 'dynamoid', '~> 1',                 :platforms => :ruby
-gem 'aws-sdk', '~>2',                   :platforms => :ruby
+gem "mongoid", "~>4.0"
+gem "sequel"
+gem "dynamoid", "~> 1", :platforms => :ruby
+gem "aws-sdk", "~>2", :platforms => :ruby
 gem "redis-objects"
 
 gemspec :path => "../"
diff --git a/gemfiles/rails_4.0_mongo_mapper.gemfile b/gemfiles/rails_4.0_mongo_mapper.gemfile
index 707fd6b..acb4167 100644
--- a/gemfiles/rails_4.0_mongo_mapper.gemfile
+++ b/gemfiles/rails_4.0_mongo_mapper.gemfile
@@ -1,16 +1,18 @@
+# This file was generated by Appraisal
+
 source "https://rubygems.org"
 
-gem "sqlite3",                          :platforms => :ruby
-gem 'rubysl',                           :platforms => :rbx
-gem 'rubinius-developer_tools',         :platforms => :rbx
-gem "jruby-openssl",                    :platforms => :jruby
+gem "sqlite3", :platforms => :ruby
+gem "rubysl", :platforms => :rbx
+gem "rubinius-developer_tools", :platforms => :rbx
+gem "jruby-openssl", :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
+gem "mime-types", "~> 2", :platforms => [:ruby_19, :jruby]
 gem "rails", "4.0.13"
-gem 'sequel'
-gem 'mongo_mapper', '~>0.13'
-gem 'bson_ext',                          :platforms => :ruby
-gem 'dynamoid', '~> 1',                  :platforms => :ruby
-gem 'aws-sdk', '~>2',                    :platforms => :ruby
+gem "sequel"
+gem "mongo_mapper", "~>0.13.1"
+gem "bson_ext", :platforms => :ruby
+gem "dynamoid", "~> 1", :platforms => :ruby
+gem "aws-sdk", "~>2", :platforms => :ruby
 
 gemspec :path => "../"
diff --git a/gemfiles/rails_4.2.gemfile b/gemfiles/rails_4.2.gemfile
index bbdafa7..3d3fe07 100644
--- a/gemfiles/rails_4.2.gemfile
+++ b/gemfiles/rails_4.2.gemfile
@@ -1,15 +1,16 @@
+# This file was generated by Appraisal
+
 source "https://rubygems.org"
 
-gem "sqlite3",                          :platforms => :ruby
-gem 'rubysl',                           :platforms => :rbx
-gem 'rubinius-developer_tools',         :platforms => :rbx
-gem "jruby-openssl",                    :platforms => :jruby
+gem "sqlite3", :platforms => :ruby
+gem "rubysl", :platforms => :rbx
+gem "rubinius-developer_tools", :platforms => :rbx
+gem "jruby-openssl", :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
+gem "mime-types", "~> 2", :platforms => [:ruby_19, :jruby]
 gem "rails", "4.2.5"
-gem 'mongoid', '~>4.0' if Gem::Version.create(RUBY_VERSION.dup) >= Gem::Version.create('1.9.3')
-gem 'sequel'
-gem 'dynamoid', '~> 1',                 :platforms => :ruby
-gem 'aws-sdk', '~>2',                   :platforms => :ruby
+gem "sequel"
+gem "dynamoid", "~> 1", :platforms => :ruby
+gem "aws-sdk", "~>2", :platforms => :ruby
 
 gemspec :path => "../"
diff --git a/gemfiles/rails_4.2_mongo_mapper.gemfile b/gemfiles/rails_4.2_mongo_mapper.gemfile
index c113b26..abb909d 100644
--- a/gemfiles/rails_4.2_mongo_mapper.gemfile
+++ b/gemfiles/rails_4.2_mongo_mapper.gemfile
@@ -1,17 +1,19 @@
+# This file was generated by Appraisal
+
 source "https://rubygems.org"
 
-gem "sqlite3",                          :platforms => :ruby
-gem 'rubysl',                           :platforms => :rbx
-gem 'rubinius-developer_tools',         :platforms => :rbx
-gem "jruby-openssl",                    :platforms => :jruby
+gem "sqlite3", :platforms => :ruby
+gem "rubysl", :platforms => :rbx
+gem "rubinius-developer_tools", :platforms => :rbx
+gem "jruby-openssl", :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
+gem "mime-types", "~> 2", :platforms => [:ruby_19, :jruby]
 gem "rails", "4.2.5"
-gem 'sequel'
-gem 'mongo_mapper'
-gem 'bson_ext',                          :platforms => :ruby
-gem 'dynamoid', '~> 1',                  :platforms => :ruby
-gem 'aws-sdk', '~>2',                    :platforms => :ruby
+gem "sequel"
+gem "mongo_mapper"
+gem "bson_ext", :platforms => :ruby
+gem "dynamoid", "~> 1", :platforms => :ruby
+gem "aws-sdk", "~>2", :platforms => :ruby
 gem "redis-objects"
 
 gemspec :path => "../"
diff --git a/gemfiles/rails_4.2_mongoid_4.gemfile b/gemfiles/rails_4.2_mongoid_4.gemfile
new file mode 100644
index 0000000..38daf98
--- /dev/null
+++ b/gemfiles/rails_4.2_mongoid_4.gemfile
@@ -0,0 +1,17 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "sqlite3", :platforms => :ruby
+gem "rubysl", :platforms => :rbx
+gem "rubinius-developer_tools", :platforms => :rbx
+gem "jruby-openssl", :platforms => :jruby
+gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
+gem "mime-types", "~> 2", :platforms => [:ruby_19, :jruby]
+gem "rails", "4.2.5"
+gem "mongoid", "~>4.0", :platforms => [:ruby_22, :ruby_23, :jruby]
+gem "sequel"
+gem "dynamoid", "~> 1", :platforms => :ruby
+gem "aws-sdk", "~>2", :platforms => :ruby
+
+gemspec :path => "../"
diff --git a/gemfiles/rails_4.2_mongoid_5.gemfile b/gemfiles/rails_4.2_mongoid_5.gemfile
index e17f547..eaadcce 100644
--- a/gemfiles/rails_4.2_mongoid_5.gemfile
+++ b/gemfiles/rails_4.2_mongoid_5.gemfile
@@ -1,15 +1,17 @@
+# This file was generated by Appraisal
+
 source "https://rubygems.org"
 
-gem "sqlite3",                          :platforms => :ruby
-gem 'rubysl',                           :platforms => :rbx
-gem 'rubinius-developer_tools',         :platforms => :rbx
-gem "jruby-openssl",                    :platforms => :jruby
+gem "sqlite3", :platforms => :ruby
+gem "rubysl", :platforms => :rbx
+gem "rubinius-developer_tools", :platforms => :rbx
+gem "jruby-openssl", :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
+gem "mime-types", "~> 2", :platforms => [:ruby_19, :jruby]
 gem "rails", "4.2.5"
-gem 'mongoid', '~>5.0' if Gem::Version.create(RUBY_VERSION.dup) >= Gem::Version.create('1.9.3')
-gem 'sequel'
-gem 'dynamoid', '~> 1',                 :platforms => :ruby
-gem 'aws-sdk', '~>2',                   :platforms => :ruby
+gem "mongoid", "~>5.0", :platforms => [:ruby_22, :ruby_23, :jruby]
+gem "sequel"
+gem "dynamoid", "~> 1", :platforms => :ruby
+gem "aws-sdk", "~>2", :platforms => :ruby
 
 gemspec :path => "../"
diff --git a/gemfiles/rails_5.0.gemfile b/gemfiles/rails_5.0.gemfile
index d2d20ee..9d1b434 100644
--- a/gemfiles/rails_5.0.gemfile
+++ b/gemfiles/rails_5.0.gemfile
@@ -1,21 +1,14 @@
+# This file was generated by Appraisal
+
 source "https://rubygems.org"
 
-gem "sqlite3",                          :platforms => :ruby
-gem 'rubysl',                           :platforms => :rbx
-gem 'rubinius-developer_tools',         :platforms => :rbx
-gem "jruby-openssl",                    :platforms => :jruby
+gem "sqlite3", :platforms => :ruby
+gem "rubysl", :platforms => :rbx
+gem "rubinius-developer_tools", :platforms => :rbx
+gem "jruby-openssl", :platforms => :jruby
 gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-
 gem "rails", "5.0.0"
-
-# mongoid is not yet Rails 5 compatible
-# gem 'mongoid', '~>4.0' if Gem::Version.create(RUBY_VERSION.dup) >= Gem::Version.create('1.9.3')
-
-gem 'sequel'
-
-# dynamoid is not yet Rails 5 compatible
-# gem 'dynamoid', '~> 1',                 :platforms => :ruby
-
-gem 'aws-sdk', '~>2',                   :platforms => :ruby
+gem "sequel"
+gem "aws-sdk", "~>2", :platforms => :ruby
 
 gemspec :path => "../"