make set_table_name take effect immediately

4 files changed, 22 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index effb17b2ff..2d5c166075 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -636,6 +636,9 @@ module ActiveRecord #:nodoc:
       def set_table_name(value = nil, &block)
         @quoted_table_name = nil
         define_attr_method :table_name, value, &block
+
+        @arel_table = Arel::Table.new(table_name, :engine => arel_engine)
+        @relation = Relation.new(self, arel_table)
       end
       alias :table_name= :set_table_name
 
diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 68adeff882..1fa5d2ac5f 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -20,6 +20,7 @@ require 'models/warehouse_thing'
 require 'models/parrot'
 require 'models/loose_person'
 require 'models/edge'
+require 'models/joke'
 require 'rexml/document'
 require 'active_support/core_ext/exception'
 
@@ -1156,6 +1157,16 @@ class BasicsTest < ActiveRecord::TestCase
     assert_equal "bar", k.table_name
   end
 
+  def test_switching_between_table_name
+    assert_difference("GoodJoke.count") do
+      Joke.set_table_name "cold_jokes"
+      Joke.create
+
+      Joke.set_table_name "funny_jokes"
+      Joke.create
+    end
+  end
+
   def test_quoted_table_name_after_set_table_name
     klass = Class.new(ActiveRecord::Base)
 
diff --git a/activerecord/test/models/joke.rb b/activerecord/test/models/joke.rb
index 3978abc2ba..d7f01e59e6 100644
--- a/activerecord/test/models/joke.rb
+++ b/activerecord/test/models/joke.rb
@@ -1,3 +1,7 @@
 class Joke < ActiveRecord::Base
   set_table_name 'funny_jokes'
 end
+
+class GoodJoke < ActiveRecord::Base
+  set_table_name 'funny_jokes'
+end
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index 665a4fe914..b1763ff431 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -229,6 +229,10 @@ ActiveRecord::Schema.define do
     t.string :name
   end
 
+  create_table :cold_jokes, :force => true do |t|
+    t.string :name
+  end
+
   create_table :goofy_string_id, :force => true, :id => false do |t|
     t.string :id, :null => false
     t.string :info