Refactoring create action to be valid when doing POST via json

Question

The following code validates a PIN given to the user against a Subscription object. Since It does not respond_with(@confirm) it broke when doing POST using JSON with curl. How could I simplify this to respond to :html, :json, :xml.

respond_to :html, :json, :xml
def new
  @confirm = Subscription.new
end

def create
  @keyword = Keyword.joins(:shortcode).where("shortcodes.shortcode = ? and shortcodes.country = ?",params[:subscription][:shortcode],params[:subscription]   [:country]).find_or_create_by_keyword(params[:subscription][:keyword])
  if @confirm = Subscription.where(:phone => params[:subscription][:phone], :country => params[:subscription][:country], :keyword_id => @keyword.id).last
    @confirm.check_subscription_pin(params[:subscription][:pin])
    respond_with(@confirm)
  elsif @confirm && @confirm.errors.any?
    flash[:notice] = @confirm.errors
    render :action => :new      
  else
    flash[:notice] = "Subscription not found."
    render :action => :new
  end
end

Answer 1

You just have to set the content type header from your curl request.

curl --data "<xml>" \ 
     --header "Content-Type: text/xml" \
     --request subscriptions/create \
     localhost:3000