Remove deprecated image_alt helper

actionview/CHANGELOG.md

+*   Remove deprecated `image_alt` helper.
+
+    *Rafael Mendonça França*
+
 *   Fix the need of `#protect_against_forgery?` method defined in
     `ActionView::Base` subclasses. This prevents the use of forms and buttons.
 

actionview/lib/action_view/helpers/asset_tag_helper.rb

@@ -355,29 +355,6 @@ def image_tag(source, options = {})
         tag("img", options)
       end
 
-      # Returns a string suitable for an HTML image tag alt attribute.
-      # The +src+ argument is meant to be an image file path.
-      # The method removes the basename of the file path and the digest,
-      # if any. It also removes hyphens and underscores from file names and
-      # replaces them with spaces, returning a space-separated, titleized
-      # string.
-      #
-      # ==== Examples
-      #
-      #   image_alt('rails.png')
-      #   # => Rails
-      #
-      #   image_alt('hyphenated-file-name.png')
-      #   # => Hyphenated file name
-      #
-      #   image_alt('underscored_file_name.png')
-      #   # => Underscored file name
-      def image_alt(src)
-        ActiveSupport::Deprecation.warn("image_alt is deprecated and will be removed from Rails 6.0. You must explicitly set alt text on images.")
-
-        File.basename(src, ".*").sub(/-[[:xdigit:]]{32,64}\z/, "").tr("-_", " ").capitalize
-      end
-
       # Returns an HTML video tag for the +sources+. If +sources+ is a string,
       # a single video tag will be returned. If +sources+ is an array, a video
       # tag with nested source tags for each source will be returned. The

actionview/test/template/asset_tag_helper_test.rb

@@ -512,26 +512,6 @@ def test_url_to_image_alias_for_image_url
     UrlToImageToTag.each { |method, tag| assert_dom_equal(tag, eval(method)) }
   end
 
-  def test_image_alt
-    [nil, "/", "/foo/bar/", "foo/bar/"].each do |prefix|
-      assert_deprecated do
-        assert_equal "Rails", image_alt("#{prefix}rails.png")
-      end
-      assert_deprecated do
-        assert_equal "Rails", image_alt("#{prefix}rails-9c0a079bdd7701d7e729bd956823d153.png")
-      end
-      assert_deprecated do
-        assert_equal "Rails", image_alt("#{prefix}rails-f56ef62bc41b040664e801a38f068082a75d506d9048307e8096737463503d0b.png")
-      end
-      assert_deprecated do
-        assert_equal "Long file name with hyphens", image_alt("#{prefix}long-file-name-with-hyphens.png")
-      end
-      assert_deprecated do
-        assert_equal "Long file name with underscores", image_alt("#{prefix}long_file_name_with_underscores.png")
-      end
-    end
-  end
-
   def test_image_tag
     ImageLinkToTag.each { |method, tag| assert_dom_equal(tag, eval(method)) }
   end