Ruby on Rails

Robert, it does not seem like i was changing attributes in-place.

Here is what is going on, i do not understand how it can be a desired
behavior:

I created a test application:

$ rails new test_app
$ cd test_app
$ rails generate model Person name:string age:integer
$ rake db:migrate

In console:

> p = Person.create(:name=>"Johny", :age=>30)
> p.id # => 1
> p.id = 2 # => 2
> p.save # => true
No change in the database!
> p.id # => 2
> p.name = "Jim" # => "Jim"
> p.save # => true
No change in the database
> p.name # => "Jim"
> p.id = 1 # => 1
> p.save # => true
No change in the database
> p.age = 31 # => 31
> p.save # => true
In the database, the age became 31, but the name stayed "Johny"!
> p.name # => "Jim"
> p.name.object_id # => 2155015240
> p.name = "Jim" # => "Jim"
> p.name.object_id # => 2154887680
> p.save # => true
No change in the database!
> p.name = "Jimmy" # => "Jimmy"
> p.name.object_id # => 2154859980
> p.save # => true
Finally, the name changed in the database!

Alexey.

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