Complete Example
Take, for example, uploading an import file containing contacts. You don t need to store this import file, just process it and discard it.
Routes
<>strong>routes.rb
resources :contacts do
collection do
get import/new , to: :new_import # import_new_contacts_path
post :import # import_contacts_path
end
end
Form
<>views/contacts/new_import.html.erb
<%= form_for @contacts, url: import_contacts_path, html: { multipart: true } do |f| %>
<%= f.file_field :import_file %>
<% end %>
Controller
controllers/contacts_controller.rb
def new_import
end
def import
begin
Contact.import( params[:contacts][:import_file] )
flash[:success] = "<strong>Contacts Imported!</strong>"
redirect_to contacts_path
rescue => exception
flash[:error] = "There was a problem importing that contacts file.<br>
<strong>#{exception.message}</strong><br>"
redirect_to import_new_contacts_path
end
end
Contact Model
<>strong>models/contact.rb
def import import_file
File.foreach( import_file.path ).with_index do |line, index|
# Process each line.
# For any errors just raise an error with a message like this:
# raise "There is a duplicate in row #{index + 1}."
# And your controller will redirect the user and show a flash message.
end
end
Hope that helps!
Joshua
