Merge pull request #23288 from bdewater/sprockets3-sha2-alt

Fix img alt attribute generation when using Sprockets >= 3.0

actionview/CHANGELOG.md

@@ -1,3 +1,8 @@
+*   Fix stripping the digest from the automatically generated img tag alt
+    attribute when assets are handled by Sprockets >=3.0.
+
+    *Bart de Water*
+
 *   Generate `week_field` input values using a 1-based index and not a 0-based index
     as per the W3 spec: http://www.w3.org/TR/html-markup/datatypes.html#form.data.week
 

actionview/lib/action_view/helpers/asset_tag_helper.rb

@@ -229,7 +229,7 @@ module ActionView
       #   image_alt('underscored_file_name.png')
       #   # => Underscored file name
       def image_alt(src)
-        File.basename(src, '.*').sub(/-[[:xdigit:]]{32}\z/, '').tr('-_', ' ').capitalize
+        File.basename(src, '.*').sub(/-[[:xdigit:]]{32,64}\z/, '').tr('-_', ' ').capitalize
       end
 
       # Returns an html video tag for the +sources+. If +sources+ is a string,

actionview/test/template/asset_tag_helper_test.rb

@@ -448,6 +448,7 @@ class AssetTagHelperTest < ActionView::TestCase
     [nil, '/', '/foo/bar/', 'foo/bar/'].each do |prefix|
       assert_equal 'Rails', image_alt("#{prefix}rails.png")
       assert_equal 'Rails', image_alt("#{prefix}rails-9c0a079bdd7701d7e729bd956823d153.png")
+      assert_equal 'Rails', image_alt("#{prefix}rails-f56ef62bc41b040664e801a38f068082a75d506d9048307e8096737463503d0b.png")
       assert_equal 'Long file name with hyphens', image_alt("#{prefix}long-file-name-with-hyphens.png")
       assert_equal 'Long file name with underscores', image_alt("#{prefix}long_file_name_with_underscores.png")
     end