simplified installation:

+ kaminari-mongoid required inside gem since it always used
+ cleaned gemfiles
+ README upd
+ tracking both Gemfile.lock

Author: xfynx

.gitignore

@@ -2,7 +2,6 @@
 *.rbc
 .config
 .yardoc
-/Gemfile.lock
 InstalledFiles
 _yardoc
 coverage

Gemfile

@@ -5,14 +5,11 @@ source 'https://rubygems.org'
 # development dependencies will be added by default to the :development group.
 gemspec
 
-gem 'ransack', github: 'activerecord-hackery/ransack'
 gem 'ransack-mongoid', github: 'activerecord-hackery/ransack-mongoid'
 
 # Test app stuff
 
 gem 'rails', '~> 5.1'
-gem 'kaminari', '~> 1.0'
-gem 'kaminari-mongoid'
 
 gem 'devise'
 

Gemfile.lock

@@ -0,0 +1,300 @@
+GIT
+  remote: git://github.com/activerecord-hackery/ransack-mongoid.git
+  revision: bd1935293d2f285fa7cf33d2c5c90d981bf67338
+  specs:
+    ransack-mongoid (0.1.0)
+
+PATH
+  remote: .
+  specs:
+    activeadmin-mongoid (0.8.0)
+      activeadmin (>= 1.3.0)
+      jquery-rails
+      kaminari-mongoid
+      mongoid (~> 6.0)
+      sass-rails (>= 3.1.4)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (5.2.2)
+      actionpack (= 5.2.2)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+    actionmailer (5.2.2)
+      actionpack (= 5.2.2)
+      actionview (= 5.2.2)
+      activejob (= 5.2.2)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
+    actionpack (5.2.2)
+      actionview (= 5.2.2)
+      activesupport (= 5.2.2)
+      rack (~> 2.0)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.2)
+    actionview (5.2.2)
+      activesupport (= 5.2.2)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.3)
+    activeadmin (1.4.3)
+      arbre (>= 1.1.1)
+      coffee-rails
+      formtastic (~> 3.1)
+      formtastic_i18n
+      inherited_resources (>= 1.9.0)
+      jquery-rails (>= 4.2.0)
+      kaminari (>= 0.15)
+      railties (>= 4.2, < 5.3)
+      ransack (>= 1.8.7)
+      sass (~> 3.1)
+      sprockets (< 4.1)
+    activejob (5.2.2)
+      activesupport (= 5.2.2)
+      globalid (>= 0.3.6)
+    activemodel (5.2.2)
+      activesupport (= 5.2.2)
+    activerecord (5.2.2)
+      activemodel (= 5.2.2)
+      activesupport (= 5.2.2)
+      arel (>= 9.0)
+    activestorage (5.2.2)
+      actionpack (= 5.2.2)
+      activerecord (= 5.2.2)
+      marcel (~> 0.3.1)
+    activesupport (5.2.2)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
+    arbre (1.1.1)
+      activesupport (>= 3.0.0)
+    arel (9.0.0)
+    bcrypt (3.1.12)
+    bson (4.3.0)
+    builder (3.2.3)
+    capybara (3.12.0)
+      addressable
+      mini_mime (>= 0.1.3)
+      nokogiri (~> 1.8)
+      rack (>= 1.6.0)
+      rack-test (>= 0.6.3)
+      regexp_parser (~> 1.2)
+      xpath (~> 3.2)
+    cliver (0.3.2)
+    coderay (1.1.2)
+    coffee-rails (4.2.2)
+      coffee-script (>= 2.2.0)
+      railties (>= 4.0.0)
+    coffee-script (2.4.1)
+      coffee-script-source
+      execjs
+    coffee-script-source (1.12.2)
+    concurrent-ruby (1.1.3)
+    crass (1.0.4)
+    devise (4.5.0)
+      bcrypt (~> 3.0)
+      orm_adapter (~> 0.1)
+      railties (>= 4.1.0, < 6.0)
+      responders
+      warden (~> 1.2.3)
+    diff-lcs (1.3)
+    docile (1.3.1)
+    erubi (1.7.1)
+    execjs (2.7.0)
+    ffi (1.9.25)
+    formtastic (3.1.5)
+      actionpack (>= 3.2.13)
+    formtastic_i18n (0.6.0)
+    globalid (0.4.1)
+      activesupport (>= 4.2.0)
+    has_scope (0.7.2)
+      actionpack (>= 4.1)
+      activesupport (>= 4.1)
+    i18n (1.2.0)
+      concurrent-ruby (~> 1.0)
+    inherited_resources (1.9.0)
+      actionpack (>= 4.2, < 5.3)
+      has_scope (~> 0.6)
+      railties (>= 4.2, < 5.3)
+      responders
+    jquery-rails (4.3.3)
+      rails-dom-testing (>= 1, < 3)
+      railties (>= 4.2.0)
+      thor (>= 0.14, < 2.0)
+    jquery-ui-rails (6.0.1)
+      railties (>= 3.2.16)
+    jslint (1.2.0)
+      json
+    json (2.1.0)
+    kaminari (1.1.1)
+      activesupport (>= 4.1.0)
+      kaminari-actionview (= 1.1.1)
+      kaminari-activerecord (= 1.1.1)
+      kaminari-core (= 1.1.1)
+    kaminari-actionview (1.1.1)
+      actionview
+      kaminari-core (= 1.1.1)
+    kaminari-activerecord (1.1.1)
+      activerecord
+      kaminari-core (= 1.1.1)
+    kaminari-core (1.1.1)
+    kaminari-mongoid (1.0.1)
+      kaminari-core (~> 1.0)
+      mongoid
+    launchy (2.4.3)
+      addressable (~> 2.3)
+    loofah (2.2.3)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.5.9)
+    mail (2.7.1)
+      mini_mime (>= 0.1.1)
+    marcel (0.3.3)
+      mimemagic (~> 0.3.2)
+    method_source (0.9.2)
+    mimemagic (0.3.2)
+    mini_mime (1.0.1)
+    mini_portile2 (2.3.0)
+    minitest (5.11.3)
+    mongo (2.6.2)
+      bson (>= 4.3.0, < 5.0.0)
+    mongoid (6.4.2)
+      activemodel (>= 5.1, < 6.0.0)
+      mongo (>= 2.5.1, < 3.0.0)
+    nio4r (2.3.1)
+    nokogiri (1.8.5)
+      mini_portile2 (~> 2.3.0)
+    orm_adapter (0.5.0)
+    poltergeist (1.18.1)
+      capybara (>= 2.1, < 4)
+      cliver (~> 0.3.1)
+      websocket-driver (>= 0.2.0)
+    pry (0.12.2)
+      coderay (~> 1.1.0)
+      method_source (~> 0.9.0)
+    pry-rails (0.3.8)
+      pry (>= 0.10.4)
+    public_suffix (3.0.3)
+    rack (2.0.6)
+    rack-test (1.1.0)
+      rack (>= 1.0, < 3)
+    rails (5.2.2)
+      actioncable (= 5.2.2)
+      actionmailer (= 5.2.2)
+      actionpack (= 5.2.2)
+      actionview (= 5.2.2)
+      activejob (= 5.2.2)
+      activemodel (= 5.2.2)
+      activerecord (= 5.2.2)
+      activestorage (= 5.2.2)
+      activesupport (= 5.2.2)
+      bundler (>= 1.3.0)
+      railties (= 5.2.2)
+      sprockets-rails (>= 2.0.0)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.0.4)
+      loofah (~> 2.2, >= 2.2.2)
+    railties (5.2.2)
+      actionpack (= 5.2.2)
+      activesupport (= 5.2.2)
+      method_source
+      rake (>= 0.8.7)
+      thor (>= 0.19.0, < 2.0)
+    rake (12.3.2)
+    ransack (2.1.1)
+      actionpack (>= 5.0)
+      activerecord (>= 5.0)
+      activesupport (>= 5.0)
+      i18n
+    rb-fsevent (0.10.3)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
+    regexp_parser (1.3.0)
+    responders (2.4.0)
+      actionpack (>= 4.2.0, < 5.3)
+      railties (>= 4.2.0, < 5.3)
+    rspec-core (3.8.0)
+      rspec-support (~> 3.8.0)
+    rspec-expectations (3.8.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.8.0)
+    rspec-mocks (3.8.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.8.0)
+    rspec-rails (3.8.1)
+      actionpack (>= 3.0)
+      activesupport (>= 3.0)
+      railties (>= 3.0)
+      rspec-core (~> 3.8.0)
+      rspec-expectations (~> 3.8.0)
+      rspec-mocks (~> 3.8.0)
+      rspec-support (~> 3.8.0)
+    rspec-support (3.8.0)
+    sass (3.7.2)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sass-rails (5.0.7)
+      railties (>= 4.0.0, < 6)
+      sass (~> 3.1)
+      sprockets (>= 2.8, < 4.0)
+      sprockets-rails (>= 2.0, < 4.0)
+      tilt (>= 1.1, < 3)
+    simplecov (0.16.1)
+      docile (~> 1.1)
+      json (>= 1.8, < 3)
+      simplecov-html (~> 0.10.0)
+    simplecov-html (0.10.2)
+    sprockets (3.7.2)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
+    sprockets-rails (3.2.1)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
+    thor (0.20.3)
+    thread_safe (0.3.6)
+    tilt (2.0.9)
+    tzinfo (1.2.5)
+      thread_safe (~> 0.1)
+    uglifier (4.1.20)
+      execjs (>= 0.3.0, < 3)
+    warden (1.2.8)
+      rack (>= 2.0.6)
+    websocket-driver (0.7.0)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.3)
+    xpath (3.2.0)
+      nokogiri (~> 1.8)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activeadmin-mongoid!
+  capybara
+  coffee-rails (~> 4.0)
+  devise
+  jquery-rails
+  jquery-ui-rails
+  jslint
+  launchy
+  poltergeist
+  pry-rails
+  rails (~> 5.1)
+  ransack-mongoid!
+  rspec-rails (~> 3.6)
+  sass-rails (>= 5.0.6)
+  simplecov
+  uglifier (>= 1.0.3)
+
+BUNDLED WITH
+   1.17.1

README.md

@@ -10,6 +10,7 @@ ActiveAdmin is holding off on pulling Mongoid support into the core ActiveAdmin
 * Tested working on Rails 5.1.x
 * Mongoid 6.x (**WARNING**:, using a Mongoid version >= 6.1.x has resulted in a fair amount of errors seen in the wild.  Test your upgrade very carefully with any apps in which you're using this gem with Mongoid >= 6.1.x!)
 * ActiveAdmin 1.3
+* Ransack::Mongoid - it needs to explicitly declared in Gemfile with pointing to github's master since it has no releases on rubygems yet.
 
 ## Previous versions
 * Rails 4.x with Mongoid 5.x use branch rails4-mongoid5
@@ -36,7 +37,8 @@ For more on Mongoid support in ActiveAdmin see [this issue](https://github.com/g
 Add the following gems to your application's Gemfile, and lock the version:
 
 ```ruby
-gem 'activeadmin-mongoid', '0.7.0'
+gem 'activeadmin-mongoid', '0.8.0'
+gem 'ransack-mongoid', github: 'activerecord-hackery/ransack-mongoid'
 ```
 
 You can safely remove the following lines, since are already activeadmin-mongoid dependencies:

activeadmin-mongoid.gemspec

@@ -22,6 +22,7 @@ Gem::Specification.new do |gem|
 
   gem.add_runtime_dependency 'mongoid',     ['~> 6.0']
   gem.add_runtime_dependency 'activeadmin', '>= 1.3.0'
+  gem.add_runtime_dependency 'kaminari-mongoid'
   gem.add_runtime_dependency 'jquery-rails'
   gem.add_runtime_dependency 'sass-rails',  ['>= 3.1.4']
 

lib/active_admin/mongoid.rb

@@ -2,6 +2,7 @@
 require 'active_model'
 require 'mongoid'
 require 'ransack'
+require 'kaminari/mongoid'
 # require 'active_admin/mongoid/engine'
 require 'active_admin'
 require 'devise'

test_app/Gemfile

@@ -1,20 +1,14 @@
 source 'https://rubygems.org'
 
 gem 'activeadmin-mongoid', path: '../'
-gem 'activeadmin', '~> 1.3.0'
-
-# Test app stuff
 
 gem 'rails', '~> 5.1.6'
 
 gem 'pry'
 
 gem 'devise'
 
-gem 'mongoid', '~> 6.0.3', require: true
-gem 'kaminari', '~> 1.0'
-gem 'kaminari-mongoid'
-gem 'ransack', '< 1.8.7'
+gem 'ransack-mongoid', github: 'activerecord-hackery/ransack-mongoid'
 
 gem 'sprockets', '>= 3.7.2'