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How do I get values to prepopulate a new device form when navigating to it from rfid partial of view/cabinet/show page? device has_one rfid . The link from cabinet/show: <%= link_to "Create New Device (non-functional)", new_device_path({:id => @rfid.id, cabinet_id: @cabinet.id}), :class => "btn btn-primary" %> The devices_controller , I want to have the create method work when either 0 or 2 params are passed: def create(options) if options[:cabinet_id] and options[:id] @rfid = Rfid.find(params[:id]) @device = Device.new(params[:device]) @device.rfid = @rfid @device.cabinet_id = :cabinet_id else @device = Device.new(params[:device]) @cabinet = Cabinet.find(params[:device][:cabinet_id]) @device.row_id = @cabinet.row_id end respond_to do |format| if @device.save and @cabinet.refresh_capacity_used and @cabinet.refresh_consumption format.html { redirect_to @device, notice: 'Device was successfully created.' } format.json { render json: @device, status: :created, location: @device } else format.html { render action: "new" } format.json { render json: @device.errors, status: :unprocessable_entity } end end end The cabinet_id and rfid portion of new device/_form : <tr> <th>Cabinet</th> <td><%= f.select :cabinet_id, options_from_collection_for_select(Cabinet.order(:name).all, "id", "name", @device.cabinet_id) %></td> </tr> <tr> <th>RFID</th> <td><%= f.text_field :rfid, :value => params[:rfid]%></td> </tr> Thank you.

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