Fix small bug with dirty attributes and list assignment as an array.

[rafael]

I notice that when you are not using the default delimiter and make the assignment with an array, the attributes are marked as dirty when they shouldn't. eg:

ActsAsTaggableOn.delimiter = ';'
a.topic_list 
=>
['topic1', 'topic2'] 
a.topic_list = ['topic1', 'topic2'] 
a.changes
=>
{"topic_list"=>["Politics; Test", ["Politics", "Test"]]} 

This commit attempts to fix this problem.

Cheers!

[bf4]

Please rebase off master and force push.

[rafael]

(y) I just did that.

[bf4]

Would you mind adding a test? Thanks

[rafael]

Sure, I wasn't sure where to add this test. Do you think the one I just added is good?

[bf4]

Thanks, merged! Would you be interested in writing a TagList stringify conversion method?

It would be something like this:

module ActsAsTaggableOn
  class TagList < Array
     def self.stringify(tag_list)
       if tag_list.class === Array
         new(tag_list)
       else
        tag_list
       end.to_s
    end
  end
end

In the referenced code it looks like all it really wanted was a string. And a TagList has a to_s that outputs a delimited string, but is_a?(Array) is extra work because TagList.is_a?(Array)