waynehuang13 · May 27, 2014 22:02 · May 27, 2014
diff --git a/gistfile1.rb b/gistfile1.rb
@@ -0,0 +1,51 @@
+# gem 'activerecord', '4.1.1' # passes
+gem 'activerecord', '4.1.2.rc1' # fails with ActiveModel::MassAssignmentSecurity::Error: Can't mass-assign protected attributes for Membership: group_id
+gem 'protected_attributes', '1.0.7'
+require 'active_record'
+require 'minitest/autorun'
+require 'logger'
+require 'protected_attributes'
+
+# Ensure backward compatibility with Minitest 4
+Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)
+
+# This connection will do for database-independent bug reports.
+ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
+ActiveRecord::Base.logger = Logger.new(STDOUT)
+ActiveRecord::Base.mass_assignment_sanitizer = :strict
+
+ActiveRecord::Schema.define do
+  create_table :groups do |t|
+  end
+
+  create_table :users do |t|
+  end
+
+  create_table :memberships do |t|
+    t.integer  "group_id"
+    t.integer  "user_id"
+  end
+end
+
+class Group < ActiveRecord::Base
+  has_many :memberships, :dependent => :destroy
+  has_many :members, :through => :memberships, :source => :user
+end
+
+class User < ActiveRecord::Base
+  has_many :memberships
+end
+
+class Membership < ActiveRecord::Base
+  attr_accessible []
+  belongs_to :group
+  belongs_to :user
+end
+
+class BugTest < Minitest::Test
+  def test_concat
+    group = Group.create!
+    user = User.create!
+    group.members << user
+  end
+end