Ruby on Rails

Hello,
i am playing with some test application in console: creating a model,
saving it, changing its id, trying to save it again, changing the id
back, saving again, etc.
The results are sometimes unexpected, but maybe i just do not understand
how/when the records are saved.

Can anybody please tell me if calling the "save" method saves the model
immediately?
If not, what is the method to save it immediately?

I keep an Sqlite database browser open (a Firefox extension), and it
seems that some "save" calls have no effect, but after changing some
attributes, the "save" works again.
I wonder if it is because of my messing around with id, or just the data
base does not get updated immediately.

Thanks.

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