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Ruby Freak

2008-Mar-21 03:52 UTC

Error in new project boot.rb

When I create a new 2.0 project (rails project_name)
Aptana shows what appears to me to be a valid error in boot.rb

The line:

if version = self.class.gem_version

is an assignment
Should this not read:

if version == self.class.gem_version

   def load_rails_gem
      if version = self.class.gem_version
        gem ''rails'', version
      else
        gem ''rails''
      end
    rescue Gem::LoadError => load_error
      $stderr.puts %(Missing the Rails #{version} gem. Please `gem
install -v=#{version} rails`, update your RAILS_GEM_VERSION setting in
config/environment.rb for the Rails version you do have installed, or
comment out RAILS_GEM_VERSION to use the latest version installed.)
      exit 1
    end

There is also a second error reported in the (rescue Gem::LoadError =>
load_error) of "unused local variable load_error"

I changed the first problem to ==, but I am not sure what to do about
the second.

Thanks in advance.

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Stijn Pint

2008-Mar-21 09:20 UTC

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Re: Error in new project boot.rb

Hi,

You don''t have to change anything.
you can read "if version = self.class.gem_version"
as "if (version = self.class.gem_version) != nil"

For the second issue, you could just delete the "=> load_error"
part,
but I wouldn''t bother, I won''t waste my time on every little
warning
your IDE is giving you :-)


-- 
Posted via http://www.ruby-forum.com/.

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Ruby Freak

2008-Mar-24 20:22 UTC

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Re: Error in new project boot.rb

OK,

I am now confused.
You are saying that the statement

"if version = self.class.gem_version" is testing whether the
assignment was successful?

Could someone please explain this?

Thanks in advance.



On Mar 20, 8:52 pm, Ruby Freak
<twscann...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> When I create a new 2.0 project (rails project_name)
> Aptana shows what appears to me to be a valid error inboot.rb
>
> The line:
>
> if version = self.class.gem_version
>
> is an assignment
> Should this not read:
>
> if version == self.class.gem_version
>
>    def load_rails_gem
>       if version = self.class.gem_version
>         gem ''rails'', version
>       else
>         gem ''rails''
>       end
>     rescue Gem::LoadError => load_error
>       $stderr.puts %(Missing the Rails #{version} gem. Please `gem
> install -v=#{version} rails`, update your RAILS_GEM_VERSION setting in
> config/environment.rb for the Rails version you do have installed, or
> comment out RAILS_GEM_VERSION to use the latest version installed.)
>       exit 1
>     end
>
> There is also a second error reported in the (rescue Gem::LoadError =>
> load_error) of "unused local variable load_error"
>
> I changed the first problem to ==, but I am not sure what to do about
> the second.
>
> Thanks in advance.--~--~---------~--~----~------------~-------~--~----~
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Ruby Freak

2008-Mar-24 21:56 UTC

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Re: Error in new project boot.rb

Actually, I get it now.

A) It IS an assignment AND a test.
B) It is written in a compact and confusing manner.

It should say: (well at least it would more easily understood :-)

   def load_rails_gem
      version = self.class.gem_version          # an assignment
      if version                                            # a test
        gem ''rails'', version
      else
        gem ''rails''
      end


Thanks again.



On Mar 24, 1:22 pm, Ruby Freak
<twscann...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> OK,
>
> I am now confused.
> You are saying that the statement
>
> "if version = self.class.gem_version" is testing whether the
> assignment was successful?
>
> Could someone please explain this?
>
> Thanks in advance.
>
> On Mar 20, 8:52 pm, Ruby Freak
<twscann...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > When I create a new 2.0 project (rails project_name)
> > Aptana shows what appears to me to be a valid error inboot.rb
>
> > The line:
>
> > if version = self.class.gem_version
>
> > is an assignment
> > Should this not read:
>
> > if version == self.class.gem_version
>
> >    def load_rails_gem
> >       if version = self.class.gem_version
> >         gem ''rails'', version
> >       else
> >         gem ''rails''
> >       end
> >     rescue Gem::LoadError => load_error
> >       $stderr.puts %(Missing the Rails #{version} gem. Please `gem
> > install -v=#{version} rails`, update your RAILS_GEM_VERSION setting in
> > config/environment.rb for the Rails version you do have installed, or
> > comment out RAILS_GEM_VERSION to use the latest version installed.)
> >       exit 1
> >     end
>
> > There is also a second error reported in the (rescue Gem::LoadError
=>
> > load_error) of "unused local variable load_error"
>
> > I changed the first problem to ==, but I am not sure what to do about
> > the second.
>
> > Thanks in advance.--~--~---------~--~----~------------~-------~--~----~
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