How to jump over the first line in a file? (newbie)

[Mark Toth]

I have this code:

file = "filename.txt"
File.open(file) do |sFile|
while line = sFile.gets
row = line.split("\t")
a_product = Product.new(
:sku => row[0] ,
:name => row[1] ,
rice => row[2] ,
a_product.save
end
end

What if I want to jump over the first line of the file so it won´t be
imported?

Thank you,

Mark

 

[Thomas Wieczorek]

What if I want to jump over the first line of the file so it won=B4t be
imported?

You could use FasterCSV with the :header option set to true.
It is a pretty fast gem to read X separated files:
http://fastercsv.rubyforge.org/

 

[Stefano Crocco]

Alle venerd=C3=AC 28 dicembre 2007, Mark Toth ha scritto:

I have this code:

file =3D "filename.txt"
File.open(file) do |sFile|
while line =3D sFile.gets
row =3D line.split("\t")
a_product =3D Product.new(

:sku =3D> row[0] ,
:name =3D> row[1] ,
rice =3D> row[2] ,

a_product.save
end
end

What if I want to jump over the first line of the file so it won=C2=B4t be
imported?

Thank you,

Mark

A possibility is to do a call to sFile.gets before the while cycle. This wa=
y,=20
the first line of the file is read but not used.

Stefano

 

[Mark Toth]

Alle venerdì 28 dicembre 2007, Mark Toth ha scritto:

rice => row[2] ,
Mark

A possibility is to do a call to sFile.gets before the while cycle. This
way,
the first line of the file is read but not used.

Stefano

Hmmm, it sounds like a great idea! Can you please send me some code for
it?

/Mark

 

[Thomas Wieczorek]

Stefano Crocco wrote:
Hmmm, it sounds like a great idea! Can you please send me some code for
it?

Just add a sFile.gets before the while.

 

[Mark Toth]

Just add a sFile.gets before the while.

Okeeeey, so you mean like this?:

sFile.gets
file = "filename.txt"
File.open(file) do |sFile|
while line = sFile.gets
row = line.split("\t")
a_product = Product.new(
:sku => row[0] ,
:name => row[1] ,
rice => row[2] ,
a_product.save
end
end

 

[Lee Jarvis]

File#foreach anyone?

You might want to check it out, using gets before the while loop will do
the job too, though.

Regards,
Lee

 

[lrlebron]

I have this code:

file = "filename.txt"
File.open(file) do |sFile|
while line = sFile.gets
row = line.split("\t")
a_product = Product.new(
:sku => row[0] ,
:name => row[1] ,
rice => row[2] ,
a_product.save
end
end

What if I want to jump over the first line of the file so it won´t be
imported?

Thank you,

Mark

The $. variable holds the line number so you could do something like
this:

File.open("filename.txt") do |aFile|
aFile.each_line do |line|
if $. > 1
#processs data here

end
end
end


Luis

 

[Joe]

I don't see File.open here: http://ruby-doc.org/core/classes/File.html
Am I looking in the wrong place?

Also, how do you find out about globals like $. ?

Joe

I have this code:

file =3D "filename.txt"
File.open(file) do |sFile|
while line =3D sFile.gets
row =3D line.split("\t")
a_product =3D Product.new(
:sku =3D> row[0] ,
:name =3D> row[1] ,
rice =3D> row[2] ,
a_product.save
end
end

What if I want to jump over the first line of the file so it won=B4t be
imported?

Thank you,

Mark

The $. variable holds the line number so you could do something like
this:

File.open("filename.txt") do |aFile|
aFile.each_line do |line|
if $. > 1
#processs data here

end
end
end


Luis

 

[lrlebron]

I don't see File.open here:http://ruby-doc.org/core/classes/File.html
Am I looking in the wrong place?

Also, how do you find out about globals like $. ?

Joe

I have this code:
file = "filename.txt"
File.open(file) do |sFile|
while line = sFile.gets
row = line.split("\t")
a_product = Product.new(
:sku => row[0] ,
:name => row[1] ,
rice => row[2] ,
a_product.save
end
end
What if I want to jump over the first line of the file so it won´t be
imported?
Thank you,
Mark

The $. variable holds the line number so you could do something like
this:

File.open("filename.txt") do |aFile|
aFile.each_line do |line|
if $. > 1
#processs data here

Luis

Open is a kernel method
http://ruby-doc.org/core/classes/Kernel.html#M005990

For variables like $. see Programming Ruby 2ed Chapter 22 (page 334
for $.)

Luis

 

[Joe]

How would I know that File.open exists if I didn't look at Kernel?
The way Mark was using it, it made it look like a member of the File
class. Is this just something you have to know, or am I missing
something in ruby doc? I would think
http://ruby-doc.org/core/classes/File.html would list all members.

Is the problem that http://ruby-doc.org/core/classes/File.html doesn't
list members of a superclass?

Joe

I don't see File.open here:http://ruby-doc.org/core/classes/File.html
Am I looking in the wrong place?

Also, how do you find out about globals like $. ?

Joe

I have this code:

file =3D "filename.txt"
File.open(file) do |sFile|
while line =3D sFile.gets
row =3D line.split("\t")
a_product =3D Product.new(
:sku =3D> row[0] ,
:name =3D> row[1] ,
rice =3D> row[2] ,
a_product.save
end
end

What if I want to jump over the first line of the file so it won=B4= t be
imported?

Thank you,

Mark

The $. variable holds the line number so you could do something like
this:

File.open("filename.txt") do |aFile|
aFile.each_line do |line|
if $. > 1
#processs data here

Luis

Open is a kernel method
http://ruby-doc.org/core/classes/Kernel.html#M005990

For variables like $. see Programming Ruby 2ed Chapter 22 (page 334
for $.)

Luis

 

[Sebastian Hungerecker]

I would think
http://ruby-doc.org/core/classes/File.html would list all members.

Is the problem that http://ruby-doc.org/core/classes/File.html doesn't
list members of a superclass?

Exactly. It does however list which class is the superclass (IO) and if you
click on that you will see the method Ipen which is the same as File.open.

HTH,
Sebastian

 

[Joe]

Thanks. That's what i was missing.

Joe

Exactly. It does however list which class is the superclass (IO) and if you
click on that you will see the method Ipen which is the same as File.open.

HTH,
Sebastian

 

[James Gray]

Okeeeey, so you mean like this?:

No. To jump over a line do:

#!/usr/bin/env ruby -wKU

File.open(__FILE__) do |file| # open this code file
file.gets # read and skip one line
file.each do |line|
puts line # replace this with the needed code
end
end

__END__

James Edward Gray II