Rails - Aug 2011 - What do we mean by this code if written in Gemfile

If I write the following code for example in ''Gemfile'':

    group :development do
    gem ''xyz''
    end

    group:test do
    gem ''xyz''
    end

Thanks.

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Only install the ''xyz'' gem in the development and test
environments.
It can also be written as

group :development, :test do
  gem ''xyz''
end

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Rails has three modes:  production, development, and testing.  An 
example: when you are developing an app, you may want to show the values 
of certain variables on each page, i.e. the views that are displayed. 
Looking at the values of those variables can help you understand where 
any errors might be occurring.  In production mode, you obviously don''t
want values of variables being displayed a the bottom of your web page.

In your example, one gem is included in development mode(and presumably 
production mode), and another gem is included for testing mode only.  So 
you could infer that the gem included for testing, is a gem that 
provides facilities for writing tests.  It should be obvious that tests 
don''t execute in production mode--that would slow down your app.

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On 2 August 2011 09:44, 7stud --
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
> In your example, one gem is included in development mode(and presumably
> production mode), and another gem is included for testing mode only.  So
Only if there is a

group :production do
  gem ''xyz''
end

or the line

gem ''xyz''

not included in a ''group ... do'' block. Otherwise presume
nothing.

For further clarity Rails has three modes by *convention only* and you
can create as many as you like. We have ''staging'' for our
staging
environment and ''fallback'' for the servers that will come
online when
if the hosting of the main servers fails. You could also have a
''q_and_a'' environment for the QA team to do it''s
testing on.

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just a detial more...
for get the gems in the gemfile you must execute "bundle install"
This way a third person don''t have to know what gems are needed for
you application, only execute bundle intall and ready

On 2 ago, 11:02, Peter Hickman
<peterhickman...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:
> On 2 August 2011 09:44, 7stud --
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
>
> > In your example, one gem is included in development mode(and
presumably
> > production mode), and another gem is included for testing mode only.
 So
>
> Only if there is a
>
> group :production do
>   gem ''xyz''
> end
>
> or the line
>
> gem ''xyz''
>
> not included in a ''group ... do'' block. Otherwise presume
nothing.
>
> For further clarity Rails has three modes by *convention only* and you
> can create as many as you like. We have ''staging'' for our
staging
> environment and ''fallback'' for the servers that will come
online when
> if the hosting of the main servers fails. You could also have a
> ''q_and_a'' environment for the QA team to do it''s
testing on.
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