4 files changed, 27 insertions, 0 deletions
diff --git a/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb b/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb
index abbe37ab38..7718b29125 100644
--- a/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb
+++ b/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb
@@ -3,6 +3,7 @@ require 'models/developer'
 require 'models/computer'
 require 'models/project'
 require 'models/company'
+require 'models/course'
 require 'models/customer'
 require 'models/order'
 require 'models/categorization'
@@ -14,6 +15,7 @@ require 'models/tagging'
 require 'models/parrot'
 require 'models/person'
 require 'models/pirate'
+require 'models/professor'
 require 'models/treasure'
 require 'models/price_estimate'
 require 'models/club'
@@ -923,4 +925,14 @@ class HasAndBelongsToManyAssociationsTest < ActiveRecord::TestCase
 
     assert_deprecated { developer.projects(true) }
   end
+
+  def test_alternate_database
+    professor = Professor.create(name: "Plum")
+    course = Course.create(name: "Forensics")
+    assert_equal 0, professor.courses.count
+    assert_nothing_raised do
+      professor.courses << course
+    end
+    assert_equal 1, professor.courses.count
+  end
 end
diff --git a/activerecord/test/models/professor.rb b/activerecord/test/models/professor.rb
new file mode 100644
index 0000000000..7654eda0ef
--- /dev/null
+++ b/activerecord/test/models/professor.rb
@@ -0,0 +1,5 @@
+require_dependency 'models/arunit2_model'
+
+class Professor < ARUnit2Model
+  has_and_belongs_to_many :courses
+end
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index 7bab675b2a..1fa824bf1d 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -939,3 +939,12 @@ end
 College.connection.create_table :colleges, force: true do |t|
   t.column :name, :string, null: false
 end
+
+Professor.connection.create_table :professors, force: true do |t|
+  t.column :name, :string, null: false
+end
+
+Professor.connection.create_table :courses_professors, id: false, force: true do |t|
+  t.references :course
+  t.references :professor
+end
diff --git a/activerecord/test/support/connection.rb b/activerecord/test/support/connection.rb
index d11fd9cfc1..c5334e8596 100644
--- a/activerecord/test/support/connection.rb
+++ b/activerecord/test/support/connection.rb
@@ -1,6 +1,7 @@
 require 'active_support/logger'
 require 'models/college'
 require 'models/course'
+require 'models/professor'
 
 module ARTest
   def self.connection_name