Not sure about how it will impact the application but this is the first 
shot: https://gist.github.com/sobrinho/6309391

On Thursday, August 22, 2013 12:56:27 PM UTC-3, Gabriel Sobrinho wrote:
>
> Hey guys,
>
> What do you think about tracking habtm changes?
>
> Apparently we can't do that because when you change a habtm association it 
> is changed immediately on database instead of waiting the save call (not 
> sure why and the problem may not be because of that).
>
> Current behaviour:
>
> profile.roles_ids
> => []
>
> profile.update_attributes(:name => nil, :roles_ids => [...])
> => false
>
> profile.changes
> { "name" => ['Admin', nil] }
>
>
>
> Expected behaviour:
>
> profile.roles_ids
> => []
>
> profile.update_attributes(:name => nil, :roles_ids => [...])
> => false
>
> profile.changes
> { "name" => ['Admin', nil], :roles_ids => [[], [...]] }
>
>
>
>
> Giving some problem context, I have an application that need to audit 
> almost every change and I can track everything using the changes method but 
> habtm changes.
>
> We can write a solution like storing the initial state of roles_ids in an 
> after_initialize callback on the model and comparing it on a after_save but 
> I was thinking in a more "native" solution.
>
>
> What do you think?
>

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