claudiob · December 22, 2016 19:48 · Dec 22, 2016
diff --git a/enum_group_issue.rb b/enum_group_issue.rb
@@ -0,0 +1,49 @@
+begin
+  require "bundler/inline"
+rescue LoadError => e
+  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
+  raise e
+end
+
+gemfile(true) do
+  source "https://rubygems.org"
+  # If you change the version to "5.0.0.1", the test will pass.
+  # `git bisect` says that 9c28c54879 is the first bad commit.
+  gem "activerecord", "5.0.1"
+  gem "pg"
+end
+
+require "active_record"
+require "minitest/autorun"
+require "logger"
+
+# This connection will do for database-independent bug reports.
+ActiveRecord::Base.establish_connection adapter: "postgresql"
+ActiveRecord::Base.connection.drop_database "test_group_enum"
+ActiveRecord::Base.connection.create_database "test_group_enum"
+ActiveRecord::Base.establish_connection adapter: "postgresql", database: "test_group_enum"
+ActiveRecord::Base.logger = Logger.new(STDOUT)
+
+ActiveRecord::Schema.define do
+  create_table :posts, force: true do |t|
+    t.integer :category
+  end
+end
+
+class Post < ActiveRecord::Base
+  enum category: %i(sport entertainment)
+end
+
+class BugTest < Minitest::Test
+  def test_association_stuff
+    Post.create! category: 'sport'
+    Post.create! category: 'entertainment'
+
+    # Up to Rails 5.0.0.1, this was the result:
+    assert_equal Post.group(:category).count, {1=>1, 0=>1}
+
+    # Since Rails 5.0.1 this is the result instead:
+    # assert_equal Post.group(:category).count, {"sport"=>1, "entertainment"=>1}
+    # `git bisect` says that 9c28c54879 is the first bad commit.
+  end
+end