Rails4: How to permit a hash with dynamic keys in params?

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Rails 5.1+

params.require(:post).permit(:files => {})

Rails 5

params.require(:post).tap do |whitelisted|
  whitelisted[:files] = params[:post][:files].permit!
end

Rails 4 and below

params.require(:post).tap do |whitelisted|
  whitelisted[:files] = params[:post][:files]
end

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