Rails - Aug 2006 - Development, test and production - what for?

Could some one explain why there is three different possible databases 
– development, test and production? What''s the difference? How do you 
switch between them?

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Hi Pal,

you are switching between them by using a different environment by stating
the environment you want to use in environment.rb or by telling your
application server to do so (for example the mongrel by mongrel_rails start
-e production.

The environment is what is the ''headline'' above the
configurations. A
database-config comes with three predefined environments
''development'',
''test'' and ''production'' but you might
configure some others for yourself.

The test environment is special because integration tests with fixtures
which represent test data will be performed on a special test database. The
advantage should be obvious. On the development database you should perform
your development. This might be an physically different machine from your
production database or at least decoupled as another database on the same
machine. This way you could release stable versions to production and go
online with it and destroy nothing on your production data while you are
evolving on the development db.

Said shortly: As in many cases rails forces you to do the right thing.

Cheers,
Jan


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On Aug 22, 2006, at 1:46 AM, Pål Bergström wrote:
> Could some one explain why there is three different possible databases
> – development, test and production? What''s the difference? How do
you
> switch between them?
Development is for development.

Test is for testing.

Production is for... :-)

They are switched on via ENV[''RAILS_ENV'']

Also switched on are the config/environments/* files.

You can have more environments if you choose.

Development and Testing are related in that when running tests, the  
development DB structure is moved into testing so that tests get run  
against the current development DB structure.

All of this structure is put in place to allow you to pre-define this  
information and not have to change code when it''s used in different  
environments.

-- 
-- Tom Mornini


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Jan Prill wrote:

Well explained. Thank you (and Tom). The database names says it all, I 
know. :-)

Perhaps I should have asked how they are "managed". What happens when 
using the rake to create the db? Will that add or change in them all? (I 
could also try this so you don''t have to answer, if you don''t
feel like
it)

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Pål Bergström wrote:
>What happens when 
> using the rake to create the db? Will that add or change in them all? (I 
> could also try this so you don''t have to answer, if you
don''t feel like
> it)
And no. It doesn''t. Stupid question I guess. A change in development 
shouldn''t affect production mode instantly.

But how then do you use the others? Will a rake command automatically 
add the stuff from development to production, when ready? Or how does it 
work?

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On Aug 22, 2006, at 3:45 AM, Pål Bergström wrote:
> Pål Bergström wrote:
>> What happens when
>> using the rake to create the db? Will that add or change in them  
>> all? (I
>> could also try this so you don''t have to answer, if you
don''t feel
>> like
>> it)
>
> And no. It doesn''t. Stupid question I guess. A change in
development
> shouldn''t affect production mode instantly.
>
> But how then do you use the others? Will a rake command automatically
> add the stuff from development to production, when ready? Or how  
> does it
> work?
Migrations are technology sufficiently advanced as to appear to be  
magic. :-)

-- 
-- Tom Mornini


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