Fixed that the dynamic finders didnt treat nil as a "IS NULL" but rather "= NULL" case #515 [Demetrius]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@488 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Fixed that the dynamic finders didn't treat nil as a "IS NULL" but rather "= NULL" case #515 [Demetrius]
+
 * Added bind-named arrays for interpolating a group of ids or strings in conditions #528 [bitsweat]
 
 * Added that has_and_belongs_to_many associations with additional attributes also can be created between unsaved objects and only committed to the database when Base#save is called on the associator #524 [Eric Anderson]

activerecord/lib/active_record/base.rb

@@ -668,7 +668,9 @@ def method_missing(method_id, *arguments)
           if method_name =~ /find_(all_by|by)_([_a-z]+)/
             finder, attributes = ($1 == "all_by" ? :find_all : :find_first), $2.split("_and_")
             attributes.each { |attr_name| super unless column_methods_hash[attr_name.intern] }
-            conditions = attributes.collect { |attr_name| "#{attr_name} = ? "}.join(" AND ")
+
+            attr_index = -1
+            conditions = attributes.collect { |attr_name| attr_index += 1; "#{attr_name} #{arguments[attr_index] ? "=" : "IS"} ? " }.join(" AND ")
             send(finder, [conditions, *arguments[0...attributes.length]], *arguments[attributes.length..-1])
           else
             super

activerecord/test/finder_test.rb

@@ -193,6 +193,29 @@ def test_find_all_by_one_attribute
 
     assert_equal [], Topic.find_all_by_title("The First Topic!!")
   end
+  
+  def test_find_by_nil_attribute
+    topic = Topic.find_by_last_read nil
+    assert_not_nil topic
+    assert_nil topic.last_read
+  end
+  
+  def test_find_all_by_nil_attribute
+    topics = Topic.find_all_by_last_read nil
+    assert_equal 1, topics.size
+    assert_nil topics[0].last_read
+  end
+  
+  def test_find_by_nil_and_not_nil_attributes
+    topic = Topic.find_by_last_read_and_author_name nil, "Mary"
+    assert_equal "Mary", topic.author_name
+  end
+
+  def test_find_all_by_nil_and_not_nil_attributes
+    topics = Topic.find_all_by_last_read_and_author_name nil, "Mary"
+    assert_equal 1, topics.size
+    assert_equal "Mary", topics[0].author_name
+  end
 
   protected
     def bind(statement, *vars)