Add AbstractAdapter#table_alias_for to create table aliases according to the rules of the current adapter. [Rick]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3916 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 13 insertions, 0 deletions

diff --git a/activerecord/test/adapter_test.rb b/activerecord/test/adapter_test.rb
index af76ebfc9a..2c98045cee 100644
--- a/activerecord/test/adapter_test.rb
+++ b/activerecord/test/adapter_test.rb
@@ -46,6 +46,19 @@ class AdapterTest < Test::Unit::TestCase
     end
   end
 
+  def test_table_alias
+    old = @connection.table_alias_length
+    def @connection.table_alias_length() 10; end
+      
+    assert_equal 'posts',      @connection.table_alias_for('posts')
+    assert_equal 'posts',      @connection.table_alias_for('posts', 1)
+    assert_equal 'posts_2',    @connection.table_alias_for('posts', 2)
+    assert_equal 'posts_comm', @connection.table_alias_for('posts_comments')
+    assert_equal 'posts_co_2', @connection.table_alias_for('posts_comments', 2)
+    
+    def @connection.table_alias_length() old; end
+  end
+
   # test resetting sequences in odd tables in postgreSQL
   if ActiveRecord::Base.connection.respond_to?(:reset_pk_sequence!)
     require 'fixtures/movie'