Use a decorator module for Files instantiated by Hash.from_xml. Add test coverage. Closes #10726 [Cheah Chu Yeow]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8579 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/lib/active_support/core_ext/hash/conversions.rb

@@ -24,10 +24,25 @@ class XmlSimple
   end
 end
 
+# This module exists to decorate files deserialized using Hash.from_xml with
+# the <tt>original_filename</tt> and <tt>content_type</tt> methods.
+module FileLike #:nodoc:
+  attr_writer :original_filename, :content_type
+
+  def original_filename
+    @original_filename || 'untitled'
+  end
+
+  def content_type
+    @content_type || 'application/octet-stream'
+  end
+end
+
 module ActiveSupport #:nodoc:
   module CoreExtensions #:nodoc:
     module Hash #:nodoc:
       module Conversions
+
         XML_TYPE_NAMES = {
           "Symbol"     => "symbol",
           "Fixnum"     => "integer",
@@ -63,11 +78,11 @@ module ActiveSupport #:nodoc:
             "string"       => Proc.new  { |string|  string.to_s },
             "yaml"         => Proc.new  { |yaml|    YAML::load(yaml) rescue yaml },
             "base64Binary" => Proc.new  { |bin|     Base64.decode64(bin) },
-            # FIXME: Get rid of eval and institute a proper decorator here
             "file"         => Proc.new do |file, entity|
               f = StringIO.new(Base64.decode64(file))
-              eval "def f.original_filename() '#{entity["name"]}' || 'untitled' end"
-              eval "def f.content_type()      '#{entity["content_type"]}' || 'application/octet-stream' end"
+              f.extend(FileLike)
+              f.original_filename = entity['name']
+              f.content_type = entity['content_type']
               f
             end
           }

activesupport/test/core_ext/hash_ext_test.rb

@@ -533,9 +533,9 @@ class HashToXmlTest < Test::Unit::TestCase
   def test_single_record_from_xml_with_attributes_other_than_type
     topic_xml = <<-EOT
     <rsp stat="ok">
-    	<photos page="1" pages="1" perpage="100" total="16">
-    		<photo id="175756086" owner="55569174@N00" secret="0279bf37a1" server="76" title="Colored Pencil PhotoBooth Fun" ispublic="1" isfriend="0" isfamily="0"/>
-    	</photos>
+      <photos page="1" pages="1" perpage="100" total="16">
+        <photo id="175756086" owner="55569174@N00" secret="0279bf37a1" server="76" title="Colored Pencil PhotoBooth Fun" ispublic="1" isfriend="0" isfamily="0"/>
+      </photos>
     </rsp>
     EOT
 
@@ -599,6 +599,34 @@ class HashToXmlTest < Test::Unit::TestCase
     assert_equal expected_blog_hash, Hash.from_xml(blog_xml)
   end
 
+  def test_file_from_xml
+    blog_xml = <<-XML
+      <blog>
+        <logo type="file" name="logo.png" content_type="image/png">
+        </logo>
+      </blog>
+    XML
+    hash = Hash.from_xml(blog_xml)
+    assert hash.has_key?('blog')
+    assert hash['blog'].has_key?('logo')
+
+    file = hash['blog']['logo']
+    assert_equal 'logo.png', file.original_filename
+    assert_equal 'image/png', file.content_type
+  end
+
+  def test_file_from_xml_with_defaults
+    blog_xml = <<-XML
+      <blog>
+        <logo type="file">
+        </logo>
+      </blog>
+    XML
+    file = Hash.from_xml(blog_xml)['blog']['logo']
+    assert_equal 'untitled', file.original_filename
+    assert_equal 'application/octet-stream', file.content_type
+  end
+
   def test_xsd_like_types_from_xml
     bacon_xml = <<-EOT
     <bacon>