Output buffering

ruby-talk
1

Hi,
Is there any way to do php-style output buffering with ruby or rails?
as in:

ob_start()
%>
html goes in here
<%
html=ob_get_contents()
ob_end_clean()
puts html

···

----------
Thanks,
- Mark

2

hi

mark wrote:

Is there any way to do php-style output buffering with ruby or rails?
as in:
ob_start()

In ruby, generally, you'd achieve the same thing by redirecting $stdout. Something like:

require 'stringio'
tmp_out = StringIO.new()

# redirect STDOUT
$stdout = tmp_out

puts "this and that" # would normally go to STDOUT

# restore default stdout
$stdout = STDOUT

tmp_out.rewind()
puts tmp_out.read() # print out what was sent to STDOUT

I don't know whether Ruby on Rails has any special facility for temporarily redirecting output of literal HTML snippets within a mixed Ruby-HTML template (as the PHP function does, iirc). The rails mailing list should be able to help you with that one.

cheers
alex

3

This is an old thread but it helped me. See my write-up here:

···

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4

Thanks for the reply Alex but this doesn't seem to work, maybe it's a
mod_ruby thing but nothing after
$stdout = tmp_out
gets sent no matter what I do with $stdout

5

Mark,

I am having a similar problem. Have you ever figured out how to do
ob_start() in Ruby?

thanks,
eduard

···

On 1/2/06, Alex Fenton <alex@deleteme.pressure.to> wrote:

hi

mark wrote:
> Is there any way to do php-style output buffering with ruby or rails?
> as in:
> ob_start()

In ruby, generally, you'd achieve the same thing by redirecting $stdout.
Something like:

require 'stringio'
tmp_out = StringIO.new()

# redirect STDOUT
$stdout = tmp_out

puts "this and that" # would normally go to STDOUT

# restore default stdout
$stdout = STDOUT

tmp_out.rewind()
puts tmp_out.read() # print out what was sent to STDOUT

I don't know whether Ruby on Rails has any special facility for
temporarily
redirecting output of literal HTML snippets within a mixed Ruby-HTML
template (as the PHP function does, iirc). The rails mailing list should be
able to help you with that one.

cheers
alex

6

mark wrote:

Thanks for the reply Alex but this doesn't seem to work, maybe it's a
mod_ruby thing but nothing after
$stdout = tmp_out gets sent no matter what I do with $stdout

I think mod_ruby overloads some of ruby's standard IO mechanisms, eg the Kernel#puts method. You probably need to restore 'standard' STDOUT in a slightly different way in mod_ruby. There's a mod_ruby mailing list where you might get a quicker answer, or try googling STDOUT + mod_ruby etc

cheers
alex

7

eduard wrote:

Mark,

I am having a similar problem. Have you ever figured out how to do
ob_start() in Ruby?

I am not familiar with PHP, would you be able to give an
example where this would be useful or what this is commonly
used for? This might enable finding a ruby equivalent.

thanks,
eduard

E

···

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8

I was just trying to find an easy way set headers for each page.

Tom Fakes suggested this and it works great.

after_filter { |controller|

        controller.response.headers['Content-Length'] =
controller.response.body.length

}

···

On 1/19/06, Eero Saynatkari <ruby-forum-reg@mailinator.com> wrote:

eduard wrote:
> Mark,
>
> I am having a similar problem. Have you ever figured out how to do
> ob_start() in Ruby?

I am not familiar with PHP, would you be able to give an
example where this would be useful or what this is commonly
used for? This might enable finding a ruby equivalent.

> thanks,
> eduard

E

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