Private messages: how to REST-ify reply/preview/draft controller actions?

The draft is just a message, which has not been sent yet, and it's possible that it is not completed.

The draft is just a message, which has not been sent yet, and it's possible that it is not completed. I suggest you add a boolean attribute 'sent' to the message. If you save the object with 'sent=false' then you run only partial validations (if any at all).

This way, you have handled the 'saving draft' problem. If you save the message with 'sent=true', then you run the full validation, save the object in the database and actually send it. Don't think about the 'create' method as just other word equal to 'send'.

You are sending the message when you save it in a state allowing it to be sent. It does not matter whether the user marks the message as ready when creating it or when updating it. Handle it at the model level.

How does the 'preview' differ in functionality with just reading the message? The standard GET /messages/1 should be OK. About reply.

What is the replying? It's just creating a new message with some fields predefined. Make your :new action recognize additional parameters, and present a link on all related views, like this: Reply.

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