chap 4

Rails: ActiveModel, ActiveRecord and ActiveResource

ActiveModel + Database Support = ActiveRecord

ActiveModel via WebService API = AcitveResource

ActiveModel: all the model related without db. (Ex: validations).

ActiveRecord: associates a class to the database. (Ex: find method).

ActiveResource: Similar to ActiveRecord. However, instead of being backed by a database, an ActiveResource object is backed by another application through a web service API.

Rails: Action Pack

Action Pack: From request to response -> provides the view and controller layers.
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|- Action Dispatch: parses request, handles routing, cookies and sessions.
|- Action Controller