[Rails] attribute name selected in form

Hello,

I have a form to add terms to a thesaurus table.
I have a drop-down list for the user to select the language (fr, en,
es,), and then a text box to write a term with a code. I want to set
the @thesaurus[whichever language was selected] = term.

How can I say @thesaurus['fr'] = term, where 'fr' was the selected
language in the select box?

Parameters: { "lang"=>"fr", "thesterm"=>{"term"=>"pigment"=>""},
"commit"=>"submit"}

Thesterm Create (0.4ms) INSERT INTO `thesterms` (`en`, `fr`, `it`,
`fi`, `sr`, `code`, `refcount`) VALUES('', 'pigment', '', '', '',
NULL, NULL)

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