Issue with Rich Gem & Active Admin in Rails 4 - ruby-on-rails

Question

Rails 4.1.7
Ruby 2.1.5
Basically, I just need to add a Ckeditor Form for Active Admin.
I've got a problem integrating the Rich Gem for Active Admin.
Update:
Rich Gem supports only Formtastic and 1 and 2, it doesn't support 3, although a patch has been done to support Formtastic 3+.
I am currently using formtastic (~> 3.1).
Rendered /Users/adam/.rvm/gems/ruby-2.1.5#blog/bundler/gems/activeadmin-ed1fbca8c64a/app/views/active_admin/resource/new.html.arb (752.4ms)
Completed 500 Internal Server Error in 766ms
LoadError (Unable to autoload constant RichInput, expected /Users/adam/.rvm/gems/ruby-2.1.5#blog/gems/rich-1.4.6/app/inputs/rich_input.rb to define it):
app/admin/recipe.rb:42:in `block (5 levels) in <top (required)>'
app/admin/recipe.rb:39:in `block (4 levels) in <top (required)>'
app/admin/recipe.rb:38:in `block (3 levels) in <top (required)>'
app/admin/recipe.rb:24:in `block (2 levels) in <top (required)>'
After running, this line
➜ blog git:(master) ✗ rails generate rich:install
create config/initializers/rich.rb
route mount Rich::Engine => '/rich', :as => 'rich'
create app/assets/stylesheets/rich/editor.css
create app/assets/javascripts/rich.js
rake rich:install:migrations
git://github.com/activeadmin/activeadmin.git (at master) is not yet checked out. Run `bundle install` first.
Currently, I'm using the activeadmin gem from github. If I switch it to master I encounter other issues (related to AA).
Gemfile
gem 'rails', '4.1.7'
...
gem 'rich'
gem "paperclip", "~> 4.2"
gem 'activeadmin', github: 'activeadmin'
Gemfile Lock
GIT
remote: git://github.com/activeadmin/activeadmin.git
revision: ed1fbca8c64af827616c58f274d7be256ca513b6
specs:
activeadmin (1.0.0.pre)
arbre (~> 1.0, >= 1.0.2)
bourbon
coffee-rails
formtastic (~> 3.1)
formtastic_i18n
inherited_resources (~> 1.6)
jquery-rails
jquery-ui-rails (~> 5.0)
kaminari (~> 0.15)
rails (>= 3.2, < 5.0)
ransack (~> 1.3)
sass-rails
GEM
remote: https://rubygems.org/
specs:
actionmailer (4.1.7)
actionpack (= 4.1.7)
actionview (= 4.1.7)
mail (~> 2.5, >= 2.5.4)
actionpack (4.1.7)
actionview (= 4.1.7)
activesupport (= 4.1.7)
rack (~> 1.5.2)
rack-test (~> 0.6.2)
actionview (4.1.7)
activesupport (= 4.1.7)
builder (~> 3.1)
erubis (~> 2.7.0)
activemodel (4.1.7)
activesupport (= 4.1.7)
builder (~> 3.1)
activerecord (4.1.7)
activemodel (= 4.1.7)
activesupport (= 4.1.7)
arel (~> 5.0.0)
activesupport (4.1.7)
i18n (~> 0.6, >= 0.6.9)
json (~> 1.7, >= 1.7.7)
minitest (~> 5.1)
thread_safe (~> 0.1)
tzinfo (~> 1.1)
arbre (1.0.3)
activesupport (>= 3.0.0)
arel (5.0.1.20140414130214)
bcrypt (3.1.10)
bourbon (3.2.4)
sass (~> 3.2)
thor
builder (3.2.2)
climate_control (0.0.3)
activesupport (>= 3.0)
cocaine (0.5.7)
climate_control (>= 0.0.3, < 1.0)
coffee-rails (4.0.1)
coffee-script (>= 2.2.0)
railties (>= 4.0.0, < 5.0)
coffee-script (2.3.0)
coffee-script-source
execjs
coffee-script-source (1.9.1)
commonjs (0.2.7)
devise (3.4.1)
bcrypt (~> 3.0)
orm_adapter (~> 0.1)
railties (>= 3.2.6, < 5)
responders
thread_safe (~> 0.1)
warden (~> 1.2.3)
erubis (2.7.0)
execjs (2.3.0)
formtastic (3.1.3)
actionpack (>= 3.2.13)
formtastic_i18n (0.1.1)
has_scope (0.6.0)
actionpack (>= 3.2, < 5)
activesupport (>= 3.2, < 5)
hike (1.2.3)
i18n (0.7.0)
inherited_resources (1.6.0)
actionpack (>= 3.2, < 5)
has_scope (~> 0.6.0.rc)
railties (>= 3.2, < 5)
responders
jbuilder (2.2.8)
activesupport (>= 3.0.0, < 5)
multi_json (~> 1.2)
jquery-rails (3.1.2)
railties (>= 3.0, < 5.0)
thor (>= 0.14, < 2.0)
jquery-ui-rails (5.0.3)
railties (>= 3.2.16)
json (1.8.2)
kaminari (0.16.3)
actionpack (>= 3.0.0)
activesupport (>= 3.0.0)
less (2.6.0)
commonjs (~> 0.2.7)
less-rails (2.6.0)
actionpack (>= 3.1)
less (~> 2.6.0)
libv8 (3.16.14.7)
mail (2.6.3)
mime-types (>= 1.16, < 3)
mime-types (2.4.3)
minitest (5.5.1)
multi_json (1.10.1)
mysql2 (0.3.18)
orm_adapter (0.5.0)
paperclip (4.2.1)
activemodel (>= 3.0.0)
activesupport (>= 3.0.0)
cocaine (~> 0.5.3)
mime-types
polyamorous (1.1.0)
activerecord (>= 3.0)
rack (1.5.2)
rack-raw-upload (1.1.1)
multi_json
rack-test (0.6.3)
rack (>= 1.0)
rails (4.1.7)
actionmailer (= 4.1.7)
actionpack (= 4.1.7)
actionview (= 4.1.7)
activemodel (= 4.1.7)
activerecord (= 4.1.7)
activesupport (= 4.1.7)
bundler (>= 1.3.0, < 2.0)
railties (= 4.1.7)
sprockets-rails (~> 2.0)
railties (4.1.7)
actionpack (= 4.1.7)
activesupport (= 4.1.7)
rake (>= 0.8.7)
thor (>= 0.18.1, < 2.0)
rake (10.4.2)
ransack (1.6.3)
actionpack (>= 3.0)
activerecord (>= 3.0)
activesupport (>= 3.0)
i18n
polyamorous (~> 1.1)
rdoc (4.2.0)
json (~> 1.4)
ref (1.0.5)
responders (1.1.2)
railties (>= 3.2, < 4.2)
rich (1.4.6)
jquery-rails
kaminari
mime-types
paperclip
rack-raw-upload
rails (>= 3.2.0)
sass-rails
sass (3.2.19)
sass-rails (4.0.5)
railties (>= 4.0.0, < 5.0)
sass (~> 3.2.2)
sprockets (~> 2.8, < 3.0)
sprockets-rails (~> 2.0)
sdoc (0.4.1)
json (~> 1.7, >= 1.7.7)
rdoc (~> 4.0)
spring (1.3.2)
sprockets (2.12.3)
hike (~> 1.2)
multi_json (~> 1.0)
rack (~> 1.0)
tilt (~> 1.1, != 1.3.0)
sprockets-rails (2.2.4)
actionpack (>= 3.0)
activesupport (>= 3.0)
sprockets (>= 2.8, < 4.0)
therubyracer (0.12.1)
libv8 (~> 3.16.14.0)
ref
thor (0.19.1)
thread_safe (0.3.4)
tilt (1.4.1)
turbolinks (2.5.3)
coffee-rails
twitter-bootstrap-rails (3.2.0)
actionpack (~> 4.1)
execjs (~> 2.2)
rails (~> 4.1)
railties (~> 4.1)
tzinfo (1.2.2)
thread_safe (~> 0.1)
uglifier (2.7.0)
execjs (>= 0.3.0)
json (>= 1.8.0)
warden (1.2.3)
rack (>= 1.0)
PLATFORMS
ruby
DEPENDENCIES
activeadmin!
coffee-rails (~> 4.0.0)
devise
jbuilder (~> 2.0)
jquery-rails
less-rails
mysql2
paperclip (~> 4.2)
rails (= 4.1.7)
rich
sass-rails (~> 4.0.3)
sdoc (~> 0.4.0)
spring
therubyracer
turbolinks
twitter-bootstrap-rails
uglifier (>= 1.3.0)

Answer 1

Well , this is always the last option to be tried when it comes to version dependencies but solves the problem .
Download the rich gem and manually place it in the vendor folder . After that , you will have to mention this in the routes file
gem 'rich', path: 'vendor/rich(actual folder name)'
Then , you can do the following
rails generate rich:install
Should be good to go , do let me know if you get stuck somewhere .