Hi All, I''m building an app that compares statistics from sports games. Each statistic has an "action" that defines what happened at that point in time, for example "player has possession" is one such action string. I use these strings to pull out / sort the statistics into meaningful information, so these strings are used throughout the app. I want to know a good place to have a list of global variables like this. I have tried : creating file called action_string_constants.rb in /lib. In this file I declare a module : module ActionStringConstants MB_ACTION_STRING_PLAYER_HAS_POSSESSION = "player has posession" end I then try and use this in another class such as Player (model) with include ActionStringConstants However this returns a NameError (uninitialized constant Player::ActionStringConstants): I then thought of including this in application.rb, as I want to use these constants in many files, but this returns a similar error when trying to launch the app. Where can I declare a string constant??! This really should be simple! -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Michael Baldock wrote in post #1061986:> I''m building an app that compares statistics from sports games. Each > statistic has an "action" that defines what happened at that point in > time, for example "player has possession" is one such action string. > > I use these strings to pull out / sort the statistics into meaningful > information, so these strings are used throughout the app. > > Where can I declare a string constant??!I generally prefer keeping my constants close to context where they are used. For example if you''re using a set of constants related to Player objects then I''d do something like: class Player < ActiveRecord::Base HAS_POSSESSION = ''player has possession'' LOST_POSSESSION = ''player has lost possession'' # Rest of implementation end However, given that Ruby provides symbols, using string constants are generally not necessary. Just use the symbol (e.g. :has_possession). If you want to validate a symbol exists in a list then just make an array constant containing the list of symbols (e.g STAT_ACTIONS = [ :has_possession, :lost_possession, ... ]); Put that in whatever class makes sense and get it from there. (e.g. Player::STAT_ACTIONS). -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Ok, thanks for the advice,
The problem i have is that I want to use these strings in the Player
model, but also many other places. There''s a statistics_controller
thats
going to need it, and potentially other controllers / models that are
going to use the database of stats to decide things.
Not being a super-fluent Ruby developer, how do these symbols work?
if I declare : HAS_POSSESSION = ''player has possession''
somewhere, does
this enable the symbol :has_posession, if so what''s the point of using
the symbol, why don''t i just use HAS_POSSESSION?
or is it that I don''t need to declare anything, and I just use
:has_possession, which equates to "has possession", which seems odd!
Just to be clear, I''ve got a database of statistics, with an attribute
called action. This action describes what happened, ie one stat.action =
"player has possession", whereas another stat.action = "player
was
tackled". It''s these strings ("player has possession" /
"player was
tackled") that I want to store in a list.
--
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Well this is what it says in config/application.rb
# Settings in config/environments/* take precedence over those
specified here.
# Application configuration should go into files in config/initializers
# -- all .rb files in that directory are automatically loaded.
And this is what I''ve done... created a file in the initializers
directory.
On Thursday, May 24, 2012 11:05:20 AM UTC-4, Ruby-Forum.com User
wrote:>
> Hi All,
>
> I''m building an app that compares statistics from sports games.
Each
> statistic has an "action" that defines what happened at that
point in
> time, for example "player has possession" is one such action
string.
>
> I use these strings to pull out / sort the statistics into meaningful
> information, so these strings are used throughout the app.
>
> I want to know a good place to have a list of global variables like
> this. I have tried :
>
> creating file called action_string_constants.rb in /lib.
> In this file I declare a module :
> module ActionStringConstants
>
> MB_ACTION_STRING_PLAYER_HAS_POSSESSION = "player has posession"
>
> end
>
> I then try and use this in another class such as Player (model) with
>
> include ActionStringConstants
>
> However this returns a NameError (uninitialized constant
> Player::ActionStringConstants):
>
>
> I then thought of including this in application.rb, as I want to use
> these constants in many files, but this returns a similar error when
> trying to launch the app.
>
> Where can I declare a string constant??!
>
> This really should be simple!
>
> --
> Posted via http://www.ruby-forum.com/.
>
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Michael Baldock wrote in post #1062126:> Just to be clear, I''ve got a database of statistics, with an attribute > called action. This action describes what happened, ie one stat.action > "player has possession", whereas another stat.action = "player was > tackled". It''s these strings ("player has possession" / "player was > tackled") that I want to store in a list.I see. You''re actually planning to use these string to present to the user in a view. In that case I''d use the Internationalization (I18n) strings file. That way it would be trivial to localize your application strings to another language at some point in the future. http://guides.rubyonrails.org/i18n.html -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Cheers both, I like the sound of the i18n method, for the localization potential, that sounds very useful. Dave - it''s good to also know where to put files so that they''re automatically loaded as well, cheers for the tip. MIke -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.