HELP-understandable error

Ruby
1

Hello all,
here is my method lines 85-92:

def contenu(nb)
@titre = @page.css(“tr”)[nb.to_i].css(“h2”).css(“a”).text
@lieu = @page.css(“tr”)[nb.to_i].css(“a”).css(“p”)[0].text
@prix = @page.css(“tr”)[nb.to_i].css(“span”)[4].text
puts @titre
puts @lieu+’|’+@prix[0…-2]
puts ‘—’
end

Here his call at line 95:

contenu(y)

Here the error:
88:in ‘contenu’: undefined method ‘text’ for nil:NilClass
(NoMethodError)from 95:in ‘’

My question: why the price-line(prix) work differently of the two others
before her?
She works fine if i put a number, and don’t work with the “nb” whithout
.to_i.
This may be a link with the character € (it’s for that the -2 at line
90, because it show “?” instead).

If you are french, i am too, et mon anglais n’est pas assez avancé pour
tout comprendre en cette langue.

Thanks to you.

2

looks like ‘css(“span”)[4]’ is returning nil
insert a line before line 88:
inspect @page.css(“tr”)[nb.to_i].css(“span”)

to see if the data matches what you expect

3

D:/Documents and
Settings/Administrator/Desktop/jpe/JPE-Complet/JPE-C.rb:92:
in inspect': wrong number of arguments(1 for 0) (ArgumentError) from D:/Documents and Settings/Administrator/Desktop/jpe/JPE-Complet/JPE-C.rb:92:incontenu’
from D:/Documents and
Settings/Administrator/Desktop/jpe/JPE-Complet/JPE-C.rb:100:in `’

Line 92 is the new line 88 (i have update my prog).
The line 100 is the “contenu(y)”.

4

sorry,
@page.css(“tr”)[nb.to_i].css(“span”).inspect

5

it should print the object
from your code you should see an array of at least 4 items, since you
are
trying to grab the fourth
If it is printing a list of less then 4 items, or is nil, thats the
cause
of the error
the job then is to figure out why your input is not as you expect

6

@page.css(“tr”)[nb.to_i].css(“span”).inspect
that make no error

7

See in the file attached.

8

Oh yes it was that, the element i will is the 4th not the 5th, i am so
stupid (because i know array start at 0).

Very much thanks to you, can i quote your name like helper in my
program?

EDIT: how can i put [RESOLVED] in the title (maybe i can’t because it’s
an e-mail system)?

9

array indexes start at 0
the element at index 4 is the fifth

looking at the output, some of the rows have less then 5 elements, and
that
is where you get the nil when using index 4

It appears that in all the output the last element is the same, so if
you
just want
to grab the last element use an index of -1

10

sure, glad i could help

merci beaucoup :wink: