Hi all,

In our current project we are managing a multi-domain Rails app and we 
sometimes need the views to specialize depending on the domain that is 
running. We used to use a separate view path that we prepended to achieve 
that and since the release of Rails 4.1 we started using variants for that 
purpose.

However, it seems variants are not supported for ActionMailer. Since 
AbstractController::Rendering only checks if request is defined and, 
subsequently, if request.variant is present, we are currently hacking the 
same behaviour by defining a request method on our Mailer like:

def request
>   @_request ||= OpenStruct.new(variant: domain)
> end


I guess the variant feature was originally implemented with content 
negotiation in mind, but at least in our use case, it works beautifully for 
alternative purposes as well. I am willing to add variants support for 
ActionMailer, if there is any interest/willingness to do so.

Best,

Ufuk Kayserilioglu

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