Strings issue

dubstep · August 26, 2011, 10:22pm

Hi everybody,

I ve got a problem with strings and the class File in rails
Indeed, when i try to do this:
File.new(“archives/sequences/archives-2011.xml”)
it works perfectly, however when i do
string = “archives/sequences/” + @filename => filename being
“archives-2011.xml”
File.new(string)

it doesn’t work!
ruby tells me it cannot find the file

does anyone could tell me why?

Thanks

theloo · August 26, 2011, 10:49pm

On 26 August 2011 21:22, thelo.g thelo [email protected] wrote:

string = “archives/sequences/” + @filename => filename being
“archives-2011.xml”
File.new(string)

it doesn’t work!
ruby tells me it cannot find the file

Output the value of “string” and see what it is.

theloo · August 26, 2011, 10:50pm

On 26 August 2011 21:22, thelo.g thelo [email protected] wrote:

it doesn’t work!
ruby tells me it cannot find the file

Show us the exact error message. Copy and paste it into the post,
don’t retype it.

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theloo · August 26, 2011, 11:11pm

thelo.g thelo wrote in post #1018716:

Hi everybody,

I ve got a problem with strings and the class File in rails
Indeed, when i try to do this:
File.new(“archives/sequences/archives-2011.xml”)
it works perfectly, however when i do
string = “archives/sequences/” + @filename => filename being
“archives-2011.xml”
File.new(string)

it doesn’t work!
ruby tells me it cannot find the file

You lie:

str1 = ‘archives/sequences/archives-2011.xml’

@filename = ‘archives-2011.xml’
str2 = “archives/sequences/” + @filename

puts str1 == str1

–output:–
true

theloo · August 26, 2011, 11:14pm

And the output of the string is:

ActionView::Template::Error (No such file or directory -
./archives/results/Archives-2011-08-26-09-56-00-UTC.xml

theloo · August 26, 2011, 11:09pm

No such file or directory -
./archives/results/Archives-2011-08-26-09-56-00-UTC.xml
Extracted source (around line #1):

1: ï»¿

RÃ©sultat

id :<%= @result %>

<% r = Result.find(@result).nameFile %>
<% string = “./archives/results/” + r %>
<% f = File.open(string) %>

Rails.root: /home/thelo/RoR/ihm_test

Application Trace | Framework Trace | Full Trace
app/views/pages/print_result.html.erb:1:in initialize' app/views/pages/print_result.html.erb:1:inopen’
app/views/pages/print_result.html.erb:1:in
`_app_views_pages_print_result_html_erb__106515637_82305240_211210089’

theloo · August 26, 2011, 11:23pm

@7stud no I do not, I might have bad explained the problem. the thing is
when i perform the following code:

No such file or directory -
./archives/results/Archives-2011-08-26-09-56-00-UTC.xml
Extracted source (around line #1):

<% r = Result.find(@result).nameFile %>
<% string = “./archives/results/” + r %>
<% f = File.open(string) %>

I got this error:
No such file or directory -
./archives/results/Archives-2011-08-26-09-56-00-UTC.xml
Extracted source (around line #1):

1: ï»¿

RÃ©sultat

id :<%= @result %>

<% r = Result.find(@result).nameFile %>
<% string = “./archives/results/” + r %>
<% f = File.open(string) %>

Rails.root: /home/thelo/RoR/ihm_test

Application Trace | Framework Trace | Full Trace
app/views/pages/print_result.html.erb:1:in initialize' app/views/pages/print_result.html.erb:1:inopen’
app/views/pages/print_result.html.erb:1:in
`_app_views_pages_print_result_html_erb__106515637_82305240_211210089’

and in the console
ActionView::Template::Error (No such file or directory -
./archives/results/Archives-2011-08-26-09-56-00-UTC.xml

So when i replace string by “Archives-2011-08-26-09-56-00-UTC.xml”
everything is ok, no problem.
I just want to understand why and fix this problem

Thanks

theloo · August 26, 2011, 11:45pm

full patch of “archives” is? if under rails root, then change code to

string = Rails.root.to_s+‘/archives/results/’+r

or write down full path to archives directory

tom

On Aug 26, 2011, at 23:23 , thelo.g thelo wrote:

<% string = “./archives/results/” + r %>

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theloo · August 26, 2011, 11:51pm

thelo.g thelo wrote in post #1018731:

@7stud no I do not, I might have bad explained the problem. the thing is
when i perform the following code:

No such file or directory -
./archives/results/Archives-2011-08-26-09-56-00-UTC.xml
Extracted source (around line #1):

<% r = Result.find(@result).nameFile %>
<% string = “./archives/results/” + r %>
<% f = File.open(string) %>

I got this error:
No such file or directory -
./archives/results/Archives-2011-08-26-09-56-00-UTC.xml
Extracted source (around line #1):

1: ï»¿

RÃ©sultat

id :<%= @result %>

<% r = Result.find(@result).nameFile %>
<% string = “./archives/results/” + r %>

So when i replace string by
“Archives-2011-08-26-09-56-00-UTC.xml”

(’./archives/results’ + r) is not the same thing as
“Archives-2011-08-26-09-56-00-UTC.xml”

Your output proves nothing.

theloo · August 26, 2011, 11:51pm

I tried but it doesn’t work, is it possible that the mistake has a ling
with \n at the end of r? because when I do:
puts ‘"’ + r + ‘"’

I get
"Archives-2011-08-26-09-56-00-UTC.xml
"

theloo · August 26, 2011, 11:57pm

I meant when i replace string by
“./archives/results/Archives-2011-08-26-09-56-00-UTC.xml”, which is
normaly similar to ‘./archives/results’ + r

theloo · August 27, 2011, 12:02am

On Aug 26, 2011, at 23:51 , thelo.g thelo wrote:

I tried but it doesn’t work, is it possible that the mistake has a ling
with \n at the end of r? because when I do:
puts ‘"’ + r + ‘"’

I get
"Archives-2011-08-26-09-56-00-UTC.xml
"

\n doesn’t matter

ruby-1.8.7-p174 :006 > File.new(“./testfile”,‘w’)
=> #<File:./testfile>
ruby-1.8.7-p174 :007 > File.new(“./testfile\n”,‘w’)
=> #<File:./testfile

you just cripple the filename …

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theloo · August 27, 2011, 12:06am

What do you mean? and if this is the case, how can I fix it?

theloo · August 27, 2011, 2:54am

thelo.g thelo wrote in post #1018739:

I tried but it doesn’t work, is it possible that the mistake has a ling
with \n at the end of r? because when I do:
puts ‘"’ + r + ‘"’

I get
"Archives-2011-08-26-09-56-00-UTC.xml
"

It’s not only possible, that is exactly what is at the end of r.

When
you are having such a problem, it is easier to see what the string
actually contains by doing one of the following:

puts “–>#{some_var}<—”
p r

which is the same as:

puts r.inspect

Here is an example:

str = “hello
world”

p str

–output:–
“hello\nworld”

And of course the newline makes a difference in the file name.
A newline is a character just like any other character. You can
test that yourself:

some_file = “html.htm”

File.open(some_file) do |f|
puts f.read
end

Once you get that to work with a filename in your current directory on
your
computer, try adding a
\n to the end of the filename stored in some_file. Does the code still
work?

To get rid of a newline at the end of a string, use chomp(). chomp()
removes a newline at the end of a string if present, otherwise it does
nothing.

theloo · August 27, 2011, 3:03am

Tom M. wrote in post #1018745:

\n doesn’t matter

ruby-1.8.7-p174 :006 > File.new("./testfile",‘w’)
=> #<File:./testfile>
ruby-1.8.7-p174 :007 > File.new("./testfile\n",‘w’)
=> #<File:./testfile

you just cripple the filename …

Really?? I don’t see a crippled filename.

…
.
.
.
.
.
.

theloo · August 27, 2011, 9:52am

Thank you guys a lot, 7stud was right, I added chomp and it works!
Hence, \n makes a difference.

theloo · August 27, 2011, 1:28pm

Luis Mondesi wrote in post #1018782:

=> #<File:./testfile

you just cripple the filename …

Really?? I don’t see a crippled filename.

You don’t see that > is in the next line?

Yes, I see exactly that.

the \n char is being
interpreted.

No kidding. And that means the file name is crippled? I don’t think
so.

theloo · August 27, 2011, 1:20pm

=> #<File:./testfile

you just cripple the filename …

Really?? I don’t see a crippled filename.

You don’t see that > is in the next line? the \n char is being
interpreted.

Just do: string.chomp

This should work (as suggested before):

string = Rails.root.to_s+'/archives/results/'+r.chomp

If you really want to be portable you should be writing file paths like:
File.join(Rails.root,“archives”,“results”,r.chomp)

–
----)(-----
Luis Mondesi
Maestro Debiano

----- START ENCRYPTED BLOCK (Triple-ROT13) ------
Gur Hohagh [Yvahk] qvfgevohgvba oevatf gur fcvevg bs Hohagh gb gur
fbsgjner
jbeyq.
----- END ENCRYPTED BLOCK (Triple-ROT13) ------