Migration to Ruby on Rails 6

Gemfile

@@ -16,7 +16,7 @@ gem 'icalendar'
 # The recurrence management library
 gem 'ice_cube'
 
-gem 'rails', '= 5.2.3'
+gem 'rails'
 
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder'

Gemfile.lock

@@ -2,29 +2,42 @@ GEM
   remote: https://rubygems.org/
   remote: https://rails-assets.org/
   specs:
-    actioncable (5.2.3)
-      actionpack (= 5.2.3)
+    actioncable (6.0.2.1)
+      actionpack (= 6.0.2.1)
       nio4r (~> 2.0)
       websocket-driver (>= 0.6.1)
-    actionmailer (5.2.3)
-      actionpack (= 5.2.3)
-      actionview (= 5.2.3)
-      activejob (= 5.2.3)
+    actionmailbox (6.0.2.1)
+      actionpack (= 6.0.2.1)
+      activejob (= 6.0.2.1)
+      activerecord (= 6.0.2.1)
+      activestorage (= 6.0.2.1)
+      activesupport (= 6.0.2.1)
+      mail (>= 2.7.1)
+    actionmailer (6.0.2.1)
+      actionpack (= 6.0.2.1)
+      actionview (= 6.0.2.1)
+      activejob (= 6.0.2.1)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.2.3)
-      actionview (= 5.2.3)
-      activesupport (= 5.2.3)
-      rack (~> 2.0)
+    actionpack (6.0.2.1)
+      actionview (= 6.0.2.1)
+      activesupport (= 6.0.2.1)
+      rack (~> 2.0, >= 2.0.8)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
-      rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.2.3)
-      activesupport (= 5.2.3)
+      rails-html-sanitizer (~> 1.0, >= 1.2.0)
+    actiontext (6.0.2.1)
+      actionpack (= 6.0.2.1)
+      activerecord (= 6.0.2.1)
+      activestorage (= 6.0.2.1)
+      activesupport (= 6.0.2.1)
+      nokogiri (>= 1.8.5)
+    actionview (6.0.2.1)
+      activesupport (= 6.0.2.1)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
-      rails-html-sanitizer (~> 1.0, >= 1.0.3)
+      rails-html-sanitizer (~> 1.1, >= 1.2.0)
     actionview-encoded_mail_to (1.0.9)
       rails
     activeadmin (2.6.0)
@@ -38,31 +51,31 @@ GEM
       ransack (~> 2.1, >= 2.1.1)
       sassc-rails (~> 2.1)
       sprockets (>= 3.0, < 4.1)
-    activejob (5.2.3)
-      activesupport (= 5.2.3)
+    activejob (6.0.2.1)
+      activesupport (= 6.0.2.1)
       globalid (>= 0.3.6)
-    activemodel (5.2.3)
-      activesupport (= 5.2.3)
-    activerecord (5.2.3)
-      activemodel (= 5.2.3)
-      activesupport (= 5.2.3)
-      arel (>= 9.0)
-    activestorage (5.2.3)
-      actionpack (= 5.2.3)
-      activerecord (= 5.2.3)
+    activemodel (6.0.2.1)
+      activesupport (= 6.0.2.1)
+    activerecord (6.0.2.1)
+      activemodel (= 6.0.2.1)
+      activesupport (= 6.0.2.1)
+    activestorage (6.0.2.1)
+      actionpack (= 6.0.2.1)
+      activejob (= 6.0.2.1)
+      activerecord (= 6.0.2.1)
       marcel (~> 0.3.1)
-    activesupport (5.2.3)
+    activesupport (6.0.2.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
+      zeitwerk (~> 2.2)
     acts-as-taggable-on (6.5.0)
       activerecord (>= 5.0, < 6.1)
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
     arbre (1.2.1)
       activesupport (>= 3.0.0)
-    arel (9.0.0)
     ast (2.4.0)
     bcrypt (3.1.13)
     bindex (0.8.1)
@@ -293,18 +306,20 @@ GEM
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    rails (5.2.3)
-      actioncable (= 5.2.3)
-      actionmailer (= 5.2.3)
-      actionpack (= 5.2.3)
-      actionview (= 5.2.3)
-      activejob (= 5.2.3)
-      activemodel (= 5.2.3)
-      activerecord (= 5.2.3)
-      activestorage (= 5.2.3)
-      activesupport (= 5.2.3)
+    rails (6.0.2.1)
+      actioncable (= 6.0.2.1)
+      actionmailbox (= 6.0.2.1)
+      actionmailer (= 6.0.2.1)
+      actionpack (= 6.0.2.1)
+      actiontext (= 6.0.2.1)
+      actionview (= 6.0.2.1)
+      activejob (= 6.0.2.1)
+      activemodel (= 6.0.2.1)
+      activerecord (= 6.0.2.1)
+      activestorage (= 6.0.2.1)
+      activesupport (= 6.0.2.1)
       bundler (>= 1.3.0)
-      railties (= 5.2.3)
+      railties (= 6.0.2.1)
       sprockets-rails (>= 2.0.0)
     rails-assets-iframe-resizer (4.1.1)
     rails-assets-jquery (3.4.1)
@@ -323,15 +338,15 @@ GEM
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.3.0)
       loofah (~> 2.3)
-    rails-i18n (5.1.3)
+    rails-i18n (6.0.0)
       i18n (>= 0.7, < 2)
-      railties (>= 5.0, < 6)
-    railties (5.2.3)
-      actionpack (= 5.2.3)
-      activesupport (= 5.2.3)
+      railties (>= 6.0.0, < 7)
+    railties (6.0.2.1)
+      actionpack (= 6.0.2.1)
+      activesupport (= 6.0.2.1)
       method_source
       rake (>= 0.8.7)
-      thor (>= 0.19.0, < 2.0)
+      thor (>= 0.20.3, < 2.0)
     rainbow (3.0.0)
     rake (13.0.1)
     ransack (2.3.0)
@@ -438,14 +453,15 @@ GEM
     unicode-display_width (1.6.0)
     warden (1.2.8)
       rack (>= 2.0.6)
-    web-console (3.7.0)
-      actionview (>= 5.0)
-      activemodel (>= 5.0)
+    web-console (4.0.1)
+      actionview (>= 6.0.0)
+      activemodel (>= 6.0.0)
       bindex (>= 0.4.0)
-      railties (>= 5.0)
+      railties (>= 6.0.0)
     websocket-driver (0.7.1)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.4)
+    zeitwerk (2.2.2)
 
 PLATFORMS
   ruby
@@ -495,7 +511,7 @@ DEPENDENCIES
   preserve
   puma
   rack-livereload
-  rails (= 5.2.3)
+  rails
   rails-assets-iframe-resizer!
   rails-assets-jquery-sparkline!
   rails-assets-jquery-visible!