[Rails] same controller and database, different views based on domain name

what is the easiest way to achieve that result?
i would like to keep controllers and models the same for all the
"applications", which, in fact, are the same. They only appear
different (the views, the css, and a parameter of the query that will
be sent to the database).
I could separate the rails app, but, doing that, i will need to
replicate every common change (a bug fix in a model method for
example) to all of them. is there a better way?

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