Generated REST controllers PUT incorrect

Currently the controller that is generated by web mvc all does not contain a working updateFromJson method. The id argument is never applied to the deserialised entity so that the attempted merge() ends up in a create instead of an update.

This is more than likely because the example method provided in ROO-3376 had this operation missing.

Steps to reproduce:

1. Run the attached roo script to create a simple REST webapp.

   roo> script --file ../ROO-3431.roo
   

2. Start the webapp.

   $ mvn tomcat:run
   

3. Create a new Word with a POST to the webapp.

   $ curl -v -XPOST -H "Content-Type:application/json" http://localhost:8080/roo-3431/words -d '{
       "word": "one"
   }'
   ...
   < HTTP/1.1 201 Created
   ...
   

4. Request the word list to make sure the new word was persisted.

   $ curl -v -XGET -H "Accept:application/json" http://localhost:8080/roo-3431/words
   ...
   [{"id":1,"version":0,"word":"one"}]
   

5. Attempt to update the word with a PUT request with the resources ID.

   $ curl -v -XPUT -H "Content-Type:application/json" http://localhost:8080/roo-3431/words/1 -d '{
       "word": "two",
       "version": 0
   }'
   ...
   < HTTP/1.1 200 OK
   ...
   

6. Request the word list again to see if the word with ID 1 was updated.

   $ curl -v -XGET -H "Accept:application/json" http://localhost:8080/roo-3431/words
   ...
   [{"id":1,"version":0,"word":"one"},{"id":2,"version":0,"word":"two"}]
   

As can be seen a new entry is created instead of the word being updated. A seccond attempt at the PUT will result in a unique constraint violation.