ember.js how can I insert new record?

I am currently learning Ember.js and get stuck about the database. I want to create a site for comments, the users are able to write a comment on and see the comment after them submitted.

I have learned basic knowledge about how to display content from the official tutorial, but the data in the tutorial were hard-coded. If I need to insert one record, how can I achieve it? with a database or something easier?

thank you