Fix date_select with discard_month and discard_year options

Closes #4553 and #4633

2 files changed, 39 insertions, 2 deletions

diff --git a/actionpack/lib/action_view/helpers/date_helper.rb b/actionpack/lib/action_view/helpers/date_helper.rb
index 3464f2d461..656564c106 100644
--- a/actionpack/lib/action_view/helpers/date_helper.rb
+++ b/actionpack/lib/action_view/helpers/date_helper.rb
@@ -742,7 +742,7 @@ module ActionView
 
       def select_month
         if @options[:use_hidden] || @options[:discard_month]
-          build_hidden(:month, month)
+          build_hidden(:month, month || 1)
         else
           month_options = []
           1.upto(12) do |month_number|
@@ -756,7 +756,7 @@ module ActionView
 
       def select_year
         if !@datetime || @datetime == 0
-          val = ''
+          val = '1'
           middle_year = Date.today.year
         else
           val = middle_year = year
diff --git a/actionpack/test/template/date_helper_test.rb b/actionpack/test/template/date_helper_test.rb
index 3614d2e77d..b69c47b476 100644
--- a/actionpack/test/template/date_helper_test.rb
+++ b/actionpack/test/template/date_helper_test.rb
@@ -1601,6 +1601,43 @@ class DateHelperTest < ActionView::TestCase
     assert_dom_equal expected, date_select("post", "written_on", :order=>[:year, :month], :include_blank=>true)
   end
 
+  def test_date_select_with_nil_and_blank_and_discard_month
+    @post = Post.new
+
+    start_year = Time.now.year-5
+    end_year   = Time.now.year+5
+
+    expected = %{<select id="post_written_on_1i" name="post[written_on(1i)]">\n}
+    expected << "<option value=\"\"></option>\n"
+    start_year.upto(end_year) { |i| expected << %(<option value="#{i}">#{i}</option>\n) }
+    expected << "</select>\n"
+    expected << '<input name="post[written_on(2i)]" type="hidden" id="post_written_on_2i" value="1"/>' + "\n"
+    expected << '<input name="post[written_on(3i)]" type="hidden" id="post_written_on_3i" value="1"/>' + "\n"
+
+    assert_dom_equal expected, date_select("post", "written_on", :discard_month => true, :include_blank=>true)
+  end
+
+  def test_date_select_with_nil_and_blank_and_discard_year
+    @post = Post.new
+
+    start_year = Time.now.year-5
+    end_year   = Time.now.year+5
+
+    expected = '<input id="post_written_on_1i" name="post[written_on(1i)]" type="hidden" value="1" />' + "\n"
+
+    expected << %{<select id="post_written_on_2i" name="post[written_on(2i)]">\n}
+    expected << "<option value=\"\"></option>\n"
+    1.upto(12) { |i| expected << %(<option value="#{i}">#{Date::MONTHNAMES[i]}</option>\n) }
+    expected << "</select>\n"
+
+    expected << %{<select id="post_written_on_3i" name="post[written_on(3i)]">\n}
+    expected << "<option value=\"\"></option>\n"
+    1.upto(31) { |i| expected << %(<option value="#{i}">#{i}</option>\n) }
+    expected << "</select>\n"
+
+    assert_dom_equal expected, date_select("post", "written_on", :discard_year => true, :include_blank=>true)
+  end
+
   def test_date_select_cant_override_discard_hour
     @post = Post.new
     @post.written_on = Date.new(2004, 6, 15)