File upload

files_controller.rb

class FilesController < ApplicationController

    def index
    end

    def upload
        upload = params[:babyfile]
        name =  upload.original_filename
        directory = "public/data"
        # create the file path
        path = File.join(directory, name)
        # write the file
        File.open(path, "wb") { |f| f.write(upload.read) }
        render :text => "File has been uploaded successfully"
        
    end
end

index.html.erb

<form method="post" enctype="multipart/form-data" action="<%= upload_path %>">

    <%= hidden_field_tag :authenticity_token, form_authenticity_token %>
    
    <input type="file" name="babyfile" />
    <input type="submit" name="Upload" />
</form>