Fixed that calling Model.find([]) returns [] and doesn't throw an exception #1379

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1471 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Fixed that calling Model.find([]) returns [] and doesn't throw an exception #1379
+
 * Fixed that adding a record to a has_and_belongs_to collection would always save it -- now it only saves if its a new record #1203 [Alisdair McDiarmid]
 
 * Fixed saving of in-memory association structures to happen as a after_create/after_update callback instead of after_save -- that way you can add new associations in after_create/after_update callbacks without getting them saved twice

activerecord/lib/active_record/base.rb

@@ -333,6 +333,7 @@ module ActiveRecord #:nodoc:
           when :all
             options[:include] ? find_with_associations(options) : find_by_sql(construct_finder_sql(options))
           else
+            return args.first if args.first.kind_of?(Array) && args.first.empty?
             expects_array = args.first.kind_of?(Array)
             conditions = " AND #{sanitize_sql(options[:conditions])}" if options[:conditions]
 

activerecord/test/finder_test.rb

@@ -28,6 +28,10 @@ class FinderTest < Test::Unit::TestCase
     assert_equal(topics(:second).title, Topic.find([ 2 ]).first.title)
   end
 
+  def test_find_an_empty_array
+    assert_equal [], Topic.find([])
+  end
+
   def test_find_by_ids_missing_one
     assert_raises(ActiveRecord::RecordNotFound) {
       Topic.find(1, 2, 45)