Here is the code entirely:

class SubscriptionsController<ApplicationController
  def create
   @subscription = Subscription.new(subscription_params)
      p params["subscription"]["email"]
    @subscription.save
    redirect_to root_path
  end

private

  def subscription_params
   params.require(:subscription).permit(:email)
  end
end

Views
<%= form_for @subscription do |f| %>
      <%= f.text_field :email %>
      <%= f.submit "Create", class: 'btn btn-success' %>
      <% end %>

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