Merge pull request #1297 from cesario/1294-allocated-object-cant-be-inspected

#1294 : allocated object cant be inspected [closes #1294]

activerecord/lib/active_record/base.rb

@@ -1870,12 +1870,16 @@ def readonly!
 
       # Returns the contents of the record as a nicely formatted string.
       def inspect
-        attributes_as_nice_string = self.class.column_names.collect { |name|
-          if has_attribute?(name)
-            "#{name}: #{attribute_for_inspect(name)}"
-          end
-        }.compact.join(", ")
-        "#<#{self.class} #{attributes_as_nice_string}>"
+        inspection = if @attributes
+                       self.class.column_names.collect { |name|
+                         if has_attribute?(name)
+                           "#{name}: #{attribute_for_inspect(name)}"
+                         end
+                       }.compact.join(", ")
+                     else
+                       "not initialized"
+                     end
+        "#<#{self.class} #{inspection}>"
       end
 
     protected

activerecord/test/cases/attribute_methods_test.rb

@@ -109,6 +109,14 @@ def test_respond_to_with_allocated_object
     assert_respond_to topic, :title
   end
 
+  # IRB inspects the return value of "MyModel.allocate"
+  # by inspecting it.
+  def test_allocated_object_can_be_inspected
+    topic = Topic.allocate
+    assert_nothing_raised { topic.inspect }
+    assert topic.inspect, "#<Topic not initialized>"
+  end
+
   def test_array_content
     topic = Topic.new
     topic.content = %w( one two three )