AWDWR question

Rails
1

In an early section on Action View, showing code being put directly
into the rhtml file:

<% require ‘date’
DAY_NAMES = %w{ Sunday Monday Tuesday Wednesday Thursday Friday Saturday
}
today = Date.today %>

Hello, Dave

It's <%= DAY_NAMES[today.wday] %>. Tomorrow is <%= DAY_NAMES[(today + 1).wday %>.

I get this error -

compile error
./script/…/config/…/app/views/signup/registration.rhtml:2: dynamic
constant assignment
DAY_NAMES = %w{ Sunday Monday Tuesday Wednesday Thursday Friday Saturday
}
^
./script/…/config/…/app/views/signup/registration.rhtml:8: parse
error, unexpected ‘)’, expecting ‘]’
_erbout.concat "Tomorrow is "; _erbout.concat(( DAY_NAMES[(today +
1).wday ).to_s); _erbout.concat “.\n”

Something wrong with declaring the constant ?

Stuart

2

Hi –

On Sat, 15 Jul 2006, Dark A. wrote:

Tomorrow is <%= DAY_NAMES[(today + 1).wday %>.
You’re missing a ] on that last line, after wday.

David

–
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[email protected] => me

3

Hi –

On Sat, 15 Jul 2006, Dark A. wrote:

}
David

I would have felt bad if I posted to the list for a typo but that
didn’t seem to be the issue.
It’s something related to declaring a constant. When I switchd
DAY_NAMES to day_names the code worked. What up with dat ?

I’d only tried running it through ERb with the typo fixed, which
worked – but experimenting a little more, it does indeed seem to be
true that when ActionPack does its rendering, constant assignments are
regarded as dynamic, which isn’t allowed. (“def x; A=1; end” won’t
even parse.) So this is a case where there’s a difference between
command-line erb and the erb that’s taking place programmatically in
the course of rendering.

You can, if you really want to, get around this with const_set, but
there’s probably no occasion where you’d really have a good reason to
define a constant in a view template.

David

–
http://www.rubypowerandlight.com => Ruby/Rails training & consultancy
Ruby for Rails => RUBY FOR RAILS (reviewed on
Slashdot, 7/12/2006!)
http://dablog.rubypal.com => D[avid ]A[. ]B[lack’s][ Web]log
[email protected] => me

4

On 7/15/06, [email protected] [email protected] wrote:

Hello, Dave

It's <%= DAY_NAMES[today.wday] %>. Tomorrow is <%= DAY_NAMES[(today + 1).wday %>.

You’re missing a ] on that last line, after wday.

David

I would have felt bad if I posted to the list for a typo but that
didn’t seem to be the issue.
It’s something related to declaring a constant. When I switchd
DAY_NAMES to day_names the code worked. What up with dat ?

Stuart

5

On Jul 15, 2006, at 8:43 PM, Dark A. wrote:

Right, the whole example was basically to show what not to do :slight_smile: of
course more eloquently demonstrated with purpose.
Thank you for checking and the explanation!

And I changed it to use a local variable thanks to this thread.

Dave

6

Right, the whole example was basically to show what not to do :slight_smile: of
course more eloquently demonstrated with purpose.
Thank you for checking and the explanation!

Stuart