I found the following topic in the forum:
http://www.ruby-forum.com/topic/82137
Ian J Cottee had an easy way of adding leading zeros to a number:
----
"%05d" % an_int
----
I''m still new to ruby, so I wanted to know. How would I put this into a
method that I can attach to whatever string I wanted.
I have the following in the view of my Rails app:
----
"#{order.id} #{order.name}"
----
I want to be able to create a method that will add the leading zeros to
the order.id part. I know I''ll have to do something like:
"#{order.id}".leading_zeros + "#{order.name}"
I know how to create a method. I just don''t know how to put that code
("%05d" % an_int) into the leading_zeros method and be able to attach
it
to things.
--
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.
On 1 June 2010 15:44, Matt Royer <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> I found the following topic in the forum: > http://www.ruby-forum.com/topic/82137 > > Ian J Cottee had an easy way of adding leading zeros to a number: > > ---- > > "%05d" % an_int > > ---- > > I''m still new to ruby, so I wanted to know. How would I put this into a > method that I can attach to whatever string I wanted. > > I have the following in the view of my Rails app: > > ---- > > "#{order.id} #{order.name}" > > ---- > > I want to be able to create a method that will add the leading zeros to > the order.id part. I know I''ll have to do something like: > > "#{order.id}".leading_zeros + "#{order.name}" > > I know how to create a method. I just don''t know how to put that code > ("%05d" % an_int) into the leading_zeros method and be able to attach it > to things.Rather than attempt to add a method to the String class, which is what you seem to be suggesting, You could add a method to your model that returns the id and name as a formatted string. So in order.rb something like def order_code "#{''%05d'' % id} #{name}" end Then in the view just use <%= @order.order_code %> Colin -- 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.
you could create a method called
def leading_zeros(number)
"%05d" % number
end
and then call it
"#{leading_zeros order.id}#{order.name}"
What you have with ""#{order.id}".leading_zeros
is that #{order.id} will evaluate to a string and then you are trying to
call the leading_zeros method on the string. For it to work as you intend
leading_zeros needs to be part of the String class.
There is no end of pain in doing this.
Just save leading_zeros as a helper method in the application helps and call
it as I have shown.
--
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.
Peter Hickman wrote:> you could create a method called > > def leading_zeros(number) > "%05d" % number > end > > and then call it > > "#{leading_zeros order.id}#{order.name}" >Thanks Peter! I put the method in the application_helper.rb file: ---- def leading_zeros(number) "%05d" % number end ---- And then put the following like you said: ---- #{leading_zeros order.id} #{order.name}" ---- It''s giving me this error when I refresh my view: ---- NoMethodError in Orders#index Showing app/views/orders/index.html.erb where line #9 raised: undefined method `leading_zeros'' for "00009":String ---- Any ideas? Thanks again for all your help. -- 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.
Colin Law wrote:> Rather than attempt to add a method to the String class, which is what > you seem to be suggesting, You could add a method to your model that > returns the id and name as a formatted string. So in order.rb > something like > def order_code > "#{''%05d'' % id} #{name}" > end > Then in the view just use > <%= @order.order_code %>Hi Colin, Would this work if I wanted to put the leading zeros elsewhere in my app (other views tied to other models and controllers)? Would I just reference the Order model and then do this? Thanks for your help, --Matt -- 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.
On 1 June 2010 16:18, Matt Royer <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> Peter Hickman wrote: >> you could create a method called >> >> def leading_zeros(number) >> "%05d" % number >> end >> >> and then call it >> >> "#{leading_zeros order.id}#{order.name}" >> > > Thanks Peter! > > I put the method in the application_helper.rb file: > > ---- > def leading_zeros(number) > "%05d" % number > end > ---- > > And then put the following like you said: > > ---- > #{leading_zeros order.id} #{order.name}"You have a missing " on the front, but that may just be an copy/paste error> ---- > > It''s giving me this error when I refresh my view: > > ---- > NoMethodError in Orders#index > Showing app/views/orders/index.html.erb where line #9 raised: > > undefined method `leading_zeros'' for "00009":StringAre you sure line 9 of that file is the one you have shown above? Have you remembered to save the file? Colin -- 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@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Matt Royer wrote:> Thanks Peter! > > I put the method in the application_helper.rb file: > > ---- > def leading_zeros(number) > "%05d" % number > end > ---- > > And then put the following like you said: > > ---- > #{leading_zeros order.id} #{order.name}" > ---- > > It''s giving me this error when I refresh my view: > > ---- > NoMethodError in Orders#index > Showing app/views/orders/index.html.erb where line #9 raised: > > undefined method `leading_zeros'' for "00009":String > ----Sorry Peter, This is working great! I forgot to take the .leading_zeros off of the end of the string. Dumb mistake. Thanks again!!! This is working ferfectly. --Matt -- 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.
On 1 June 2010 16:20, Matt Royer <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> Colin Law wrote: >> Rather than attempt to add a method to the String class, which is what >> you seem to be suggesting, You could add a method to your model that >> returns the id and name as a formatted string. So in order.rb >> something like >> def order_code >> "#{''%05d'' % id} #{name}" >> end >> Then in the view just use >> <%= @order.order_code %> > > Hi Colin, > > Would this work if I wanted to put the leading zeros elsewhere in my app > (other views tied to other models and controllers)? Would I just > reference the Order model and then do this?No, that an instance method of Order so will only work on Order objects. It will work in any view (associated with any controller) but only if you have an Order object. Colin -- 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@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Colin Law wrote:> Are you sure line 9 of that file is the one you have shown above? > Have you remembered to save the file?I forgot to take my previous solution out of the view. :) Dumb mistake, I know. Thanks Colin for you help! --Matt Royer -- 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.
Colin Law wrote:> No, that an instance method of Order so will only work on Order > objects. It will work in any view (associated with any controller) > but only if you have an Order object.Oh, okay. Little by little (very little it seems so far) I''m getting the hang of this. Man, this stuff is daunting, but cool to work with. Thanks again Colin. --Matt Royer -- 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.
Matt Royer wrote:> Colin Law wrote: >> No, that an instance method of Order so will only work on Order >> objects. It will work in any view (associated with any controller) >> but only if you have an Order object. > > Oh, okay. Little by little (very little it seems so far) I''m getting the > hang of this. Man, this stuff is daunting, but cool to work with. > > Thanks again Colin.Personally, I like Colin''s approach the best. Yes, while you might want to add leading zeros in various places the example you showed seems specific to instances of Order.> "#{order.id}".leading_zeros + "#{order.name}"The implementation of this would be best hidden (encapsulated) inside the Order class. If you need other classes to implement similar behavior then implement something similar inside those classes as well. In my opinion this is similar to overriding the to_s method to provide class specific behavior.> def order_code > "#{''%05d'' % id} #{name}" > end > Then in the view just use > <%= @order.order_code %>This seems to be a very clean implementation and would be my recommendation. Given the simplicity of the "%" formatter operator I see no need to re-implement it as a helper. Combining it with the addition of appending the name does make sense to factor into a method of the Order class. -- 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.