Rails - Sep 2014 - how to asign strong perameters using radio button checked value in rails

please help me to assign strong params

myapplication view:

<div style="margin:1% 0">
        <%= f.label :choose  %>
        <span id="upload">
          <%= f.radio_button :choice, "1" %>
          <%= f.label :choice, "New Presentation", :value =>
"1", :style
=> 'margin: -18px 25px 0' %>
        </span>

        <span id="select">
        <%= f.radio_button :choice, "0" %>
        <%= f.label :choice, "Select Presentation", :value =>
"0",
:style => 'margin: -18px 25px 0' %>
      </span>
      </div>

      <div id="upload_pre" style="display: none; margin:
1%">
        <%= f.file_field :ppt %>
      </div>
      <div id="selection_pre" style="display: none; margin:
1%">

      <%= f.select :presentation_id,
options_for_select(current_user.presentations.collect {|s|
[s.avatar_file_name,s.id]}), :prompt => "Please select your
Presentation"  %>
 </div>

Myapplication webnaircontroller:

def create

@webnair = Webnair.new( webnairs_params )
  def webnairs_params
    if choice == 1
    params.require(:webnair).permit(:user_id, :ppt, :choice, :title,
:description)
    else
    params.require(:webnair).permit(:user_id, :presentation_id, :choice,
:title, :description)
   end
end
end

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