Ruby on 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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