I have just started learning Rails and Ruby. I have succeeded in
building an application so far. However, recently I tried embedding
some ruby code in one of my html.erb files with the intention of
further formatting the string that was being output. The original
string was a set of lines with tab-delimited fields. So, I wanted to
put it in pretty print HTML. For this, i used some string functions
such as String.lines. When I try to view the said page, I get the
following error:
undefined method `lines'' for #<String:0x240d448>
The line of code where the error appears is:
@longshortgene.parsed_blast_report.lines { |line| print @line }
And if I insert a require ''String'' in the beginning of the
file, it
still gives me the following error:
no such file to load -- String
I am completely new to Ruby, although I am learning the language
parallel with Rails.
Can somebody please help me understand this problem, or point me to a
relevant resource?
Thanks!
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On Jun 26, 11:14 pm, amrita <amrita.p...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> > undefined method `lines'' for #<String:0x240d448> > > The line of code where the error appears is: > > @longshortgene.parsed_blast_report.lines { |line| print @line } >What is @longshortgene.parsed_blast_report ? Did you mean each_line ? Also the variable you''re using inside the block should be line, not @line (it''s got to match what is in between the | |) You should also parse the result through h or you may output invalid html Fred> And if I insert a require ''String'' in the beginning of the file, it > still gives me the following error: > > no such file to load -- String > > I am completely new to Ruby, although I am learning the language > parallel with Rails. > > Can somebody please help me understand this problem, or point me to a > relevant resource? > > Thanks!--~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@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 -~----------~----~----~----~------~----~------~--~---
Thanks, Fred. @longshortgene.parsed_blast_report is a string, which is a set of lines, each line consisting of tab-delimited fields. When I print @longshortgene.parsed_blast_report, it prints correctly. It is only when I try to parse it that I get the "undefined method" error for the method "lines". Do I need to create a new String object first using @longshortgene.parsed_blast_report and then use the method lines on it? I am going to try that next. I corrected ''@line'' to ''line'' and the error still persists. Thanks! On Jun 27, 12:46 am, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> On Jun 26, 11:14 pm, amrita <amrita.p...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > > > undefined method `lines'' for #<String:0x240d448> > > > The line of code where the error appears is: > > > @longshortgene.parsed_blast_report.lines { |line| print @line } > > What is @longshortgene.parsed_blast_report ? Did you mean each_line ? > Also the variable you''re using inside the block should be line, not > @line (it''s got to match what is in between the | |) > You should also parse the result through h or you may output invalid > html > > Fred > > > And if I insert a require ''String'' in the beginning of the file, it > > still gives me the following error: > > > no such file to load -- String > > > I am completely new to Ruby, although I am learning the language > > parallel with Rails. > > > Can somebody please help me understand this problem, or point me to a > > relevant resource? > > > Thanks!--~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
I just checked this.
There is in fact a method lines mentioned in the Ruby API docs for
string.
But if you list the methods of a string, it''s missing.
that''s from the docs:
str.lines(separator=$/) => anEnumerator
str.lines(separator=$/) {|substr| block } => str
Returns an enumerator that gives each line in the string. If a block
is given, it iterates over each line in the string.
"foo\nbar\n".lines.to_a #=> ["foo\n",
"bar\n"]
"foo\nb ar".lines.sort #=> ["b ar", "foo\n"]
So I see, what you want to do, but I don''t know, what happened to this
method.
Maybe you can use one of te other string functions like split
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On 27 Jun 2008, at 18:15, amrita wrote:> > Thanks, Fred. @longshortgene.parsed_blast_report is a string, which is > a set of lines, each line consisting of tab-delimited fields. When I > print @longshortgene.parsed_blast_report, it prints correctly. It is > only when I try to parse it that I get the "undefined method" error > for the method "lines". Do I need to create a new String object first > using @longshortgene.parsed_blast_report and then use the method lines > on it? I am going to try that next. >String doesn''t have a lines method before ruby 1.8.7. Fred> I corrected ''@line'' to ''line'' and the error still persists. > > Thanks! > > On Jun 27, 12:46 am, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> > wrote: >> On Jun 26, 11:14 pm, amrita <amrita.p...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: >> >>> undefined method `lines'' for #<String:0x240d448> >> >>> The line of code where the error appears is: >> >>> @longshortgene.parsed_blast_report.lines { |line| print @line } >> >> What is @longshortgene.parsed_blast_report ? Did you mean each_line ? >> Also the variable you''re using inside the block should be line, not >> @line (it''s got to match what is in between the | |) >> You should also parse the result through h or you may output invalid >> html >> >> Fred >> >>> And if I insert a require ''String'' in the beginning of the file, it >>> still gives me the following error: >> >>> no such file to load -- String >> >>> I am completely new to Ruby, although I am learning the language >>> parallel with Rails. >> >>> Can somebody please help me understand this problem, or point me >>> to a >>> relevant resource? >> >>> Thanks! > >--~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
OK, now that makes sense for the error to show up then. Let me try other methods such as split. Thank you, Fred and Thorsten, for your help.> > String doesn''t have a lines method before ruby 1.8.7. > > Fred >--~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
OK, here is the exact Ruby code I use now. Line1: <%= @longshortgene.parsed_blast_report %> Line2: <% @longshortgene.parsed_blast_report.split(/\n/).each do | field| %> Line3: <%= field %> Line4: <% end %> It works! Thanks again! --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---