Add strong_migrations gem (#5522)

* Add strong_migrations gem

* Incorporate PR feedback

* Move gem to group :development, :test

Gemfile

@@ -143,6 +143,7 @@ group :development, :test do
   gem "rubocop-rspec", "~> 1.37", require: false # Code style checking for RSpec files
   gem "spring", "~> 2.1" # Preloads your application so things like console, rake and tests run faster
   gem "spring-commands-rspec", "~> 1.0" # rspec command for spring
+  gem "strong_migrations", "~> 0.5" # Catch unsafe migrations in development
 end
 
 group :test do

Gemfile.lock

@@ -782,6 +782,8 @@ GEM
       dante (>= 0.2.0)
       multi_json (~> 1.0)
       stripe (>= 2.0.3)
+    strong_migrations (0.5.1)
+      activerecord (>= 5)
     test-prof (0.10.2)
     thor (0.20.3)
     thread_safe (0.3.6)
@@ -994,6 +996,7 @@ DEPENDENCIES
   storext (~> 3.1)
   stripe (~> 4.23)
   stripe-ruby-mock (~> 2.5)
+  strong_migrations (~> 0.5)
   test-prof (~> 0.10)
   timber (~> 3.0)
   timber-rails (~> 1.0)

config/initializers/strong_migrations.rb

@@ -0,0 +1,5 @@
+# https://github.com/ankane/strong_migrations#existing-migrations
+StrongMigrations.start_after = 2019_12_27_114543
+
+# https://github.com/ankane/strong_migrations#target-version
+StrongMigrations.target_postgresql_version = 11