ruby on rails - argument error/wrong number of arguments - I have no idea what's going on here, -

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i'm trying use paperclip , update listing whenever on form receive error.

argumenterror in listingscontroller#update wrong number of arguments (2 1)

code follows , line highlighted being @ fault begins if @listing.update(listing_params)

     @listing = listing.new     respond_to |format|       if @listing.update(listing_params)         format.html { redirect_to @listing, notice: 'listing updated.' }         format.json { head :no_content }       else

this application trace

app/controllers/listings_controller.rb:45:in `block in update' app/controllers/listings_controller.rb:44:in `update'

is there i'm missing, syntax-wise, or else? many thanks.

edit:

the code listings model (listings.rb) follows

class listing < activerecord::base   has_attached_file :image, :styles => { :medium => "200x", :thumb => "100x100>" }, :default_url  => "default.jpg" end

my form (_form.html.erb) follows: 

<%= form_for @listing, :html => { :multipart => true } |f| %>   <% if @listing.errors.any? %>     <div id="error_explanation">       <h2><%= pluralize(@listing.errors.count, "error") %> prohibited listing being saved:</h2>        <ul>       <% @listing.errors.full_messages.each |msg| %>         <li><%= msg %></li>       <% end %>       </ul>     </div>   <% end %>    <div class="field">     <%= f.label :name %><br>     <%= f.text_field :name, class: "form-control" %>   </div>   <div class="field">     <%= f.label :description %><br>     <%= f.text_area :description, class: "form-control" %>   </div>   <div class="field">     <%= f.label :price %><br>     <%= f.text_field :price, class: "form-control" %>   </div>   <div class="form-group">     <%= f.file_field :image, class: "form-control" %>   </div>   <div class="actions">     <%= f.submit class: "btn btn-primary" %>   </div> <% end %>

you updating listing. need remove

@listing = listing.new

by writing initialising listing. it's update method hence need find listing not initialise new listing try

@listing = listing.find(params[:id]) #this find listing id respond_to |format|   if @listing.update(listing_params) #this update listing find above     format.html { redirect_to @listing, notice: 'listing updated.' }     format.json { head :no_content }   else     #code   end end

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