Don't call unsupported methods on associated objects when using :include,...

Don't call unsupported methods on associated objects when using :include, :method with to_xml [manfred, jwilger] Closes  #7307


git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7156 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

 *SVN*
 
+* Don't call unsupported methods on associated objects when using :include, :method with to_xml #7307, [manfred, jwilger]
+
 * Define collection singular ids method for has_many :through associations.  #8763 [lifofifo]
 
 * Array attribute conditions work with proxied association collections.  #8318 [kamal, theamazingrando]

activerecord/lib/active_record/xml_serialization.rb

@@ -178,10 +178,12 @@ def serializable_attributes
     end
 
     def serializable_method_attributes
-      Array(options[:methods]).collect { |name| MethodAttribute.new(name.to_s, @record) }
+      Array(options[:methods]).inject([]) do |method_attributes, name|
+        method_attributes << MethodAttribute.new(name.to_s, @record) if @record.respond_to?(name.to_s)
+        method_attributes
+      end
     end
 
-
     def add_attributes
       (serializable_attributes + serializable_method_attributes).each do |attribute|
         add_tag(attribute)

activerecord/test/fixtures/author.rb

@@ -67,6 +67,10 @@ def after_initialize
     @post_log = []
   end
 
+  def label
+    "#{id}-#{name}"
+  end
+
   private
     def log_before_adding(object)
       @post_log << "before_adding#{object.id}"

activerecord/test/xml_serialization_test.rb

 require 'abstract_unit'
 require 'fixtures/post'
 require 'fixtures/author'
+require 'fixtures/tagging'
 
 class Contact < ActiveRecord::Base
   # mock out self.columns so no pesky db is needed for these tests
@@ -142,12 +143,23 @@ def test_passing_hash_shouldnt_reuse_builder
     second_xml_size = david.to_xml(options).size
     assert_equal first_xml_size, second_xml_size
   end
-  
 
   def test_include_uses_association_name
-    xml = authors(:david).to_xml :include=>:hello_posts, :indent=>0
+    xml = authors(:david).to_xml :include=>:hello_posts, :indent => 0
     assert_match %r{<hello-posts type="array">}, xml
     assert_match %r{<post>}, xml
     assert_match %r{<sti-post>}, xml
   end
+  
+  def test_methods_are_called_on_object
+    xml = authors(:david).to_xml :methods => :label, :indent => 0
+    assert_match %r{<label>.*</label>}, xml
+  end
+  
+  def test_should_not_call_methods_on_associations_that_dont_respond
+    xml = authors(:david).to_xml :include=>:hello_posts, :methods => :label, :indent => 2
+    assert !authors(:david).hello_posts.first.respond_to?(:label)
+    assert_match %r{^  <label>.*</label>}, xml
+    assert_no_match %r{^      <label>}, xml
+  end
 end
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