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tobyclemson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Jul-27 13:50 UTC

Number formatter

Hi,

Does anyone know if the reverse of the rails 20.kilobytes (megabytes/
gigabytes etc.) exists? I have lots of values in my model that are
stored as bytes and I''d like to easily convert them to a MB or GB
approximation (say 1 decimal place) with *B as a suffix after the
number.

I also need to do the same for decimal numbers in terms of thousands
and millions.

I could write something to do it but I wondered if there was an easier
way?

Also if I did write a class to deal with it where in the rails
directory structure should it go? helpers?

Thanks,
Toby


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gene.tani-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Jul-27 14:00 UTC

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Re: Number formatter

On Jul 27, 6:50 am,
"tobyclem...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org"
<tobyclem...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Hi,
>
> Does anyone know if the reverse of the rails 20.kilobytes (megabytes/
> gigabytes etc.) exists? I have lots of values in my model that are
> stored as bytes and I''d like to easily convert them to a MB or GB
> approximation (say 1 decimal place) with *B as a suffix after the
> number.
>
> I also need to do the same for decimal numbers in terms of thousands
> and millions.
>
> I could write something to do it but I wondered if there was an easier
> way?
>
> Also if I did write a class to deal with it where in the rails
> directory structure should it go? helpers?
>
> Thanks,
> Toby
http://api.rubyonrails.org/classes/ActiveSupport/CoreExtensions/Numeric/Bytes.html


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tobyclemson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Jul-27 14:08 UTC

head link

Re: Number formatter

I am aware of the ruby extensions that will go in one direction but
those don''t work in the other direction. All my values are bytes
already and I want to convert those to kilo/mega/giga bytes etc.



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jemminger

2007-Jul-27 14:10 UTC

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Re: Number formatter

> Also if I did write a class to deal with it where in the rails
> directory structure should it go? helpers?
You could put it there if you think you''re unlikely to use it anywhere
other than just this app, else I tend to put things like this into
their own file in lib.


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jemminger

2007-Jul-27 14:56 UTC

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Re: Number formatter

that was a fun little exercise... here''s how i interpreted your need:

class Numeric
  def to(unit, places=1)
    units = { :b => 1,
              :kb => 1024**1,
              :mb => 1024**2,
              :gb => 1024**3,
              :tb => 1024**4,
              :pb => 1024**5,
              :eb => 1024**6}
    unitval = units[unit.to_s.downcase.to_sym]
    "#{sprintf("%.#{places}f", self / unitval)}
#{unit.to_s.upcase}"
  end # to
end

puts 1024.to(:kb)  #  1.0 KB
puts 20000.0.to(:kb)  #  19.5 KB
puts 123456789.to(:mb)  #  117.0 MB
puts 123456789.to(''MB'')  #  117.0 MB
puts 123456789.to(:MB)  #  117.0 MB
puts 123456789.to(:mb, 0)  #  117 MB
puts 345678912345.4.to(:gb, 3)  #  321.939 GB



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tobyclemson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Jul-27 15:12 UTC

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Re: Number formatter

Thanks that''s great - I did something similar in the end except mine
didn''t have the ability to choose, it just went to the smallest that
wasn''t less than zero. I think I''ll combine the two!

On Jul 27, 3:56 pm, jemminger
<jemmin...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> that was a fun little exercise... here''s how i interpreted your
need:
>
> class Numeric
>   def to(unit, places=1)
>     units = { :b => 1,
>               :kb => 1024**1,
>               :mb => 1024**2,
>               :gb => 1024**3,
>               :tb => 1024**4,
>               :pb => 1024**5,
>               :eb => 1024**6}
>     unitval = units[unit.to_s.downcase.to_sym]
>     "#{sprintf("%.#{places}f", self / unitval)}
#{unit.to_s.upcase}"
>   end # to
> end
>
> puts 1024.to(:kb)  #  1.0 KB
> puts 20000.0.to(:kb)  #  19.5 KB
> puts 123456789.to(:mb)  #  117.0 MB
> puts 123456789.to(''MB'')  #  117.0 MB
> puts 123456789.to(:MB)  #  117.0 MB
> puts 123456789.to(:mb, 0)  #  117 MB
> puts 345678912345.4.to(:gb, 3)  #  321.939 GB

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Ilan Berci

2007-Jul-27 15:12 UTC

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Re: Number formatter

tobyclemson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
> I could write something to do it but I wondered if there was an easier
> way?
> 
> Also if I did write a class to deal with it where in the rails
> directory structure should it go? helpers?
> 
> Thanks,
> Toby
I would just stick in in the core extensions as it''s very unlikely to 
conflict with anything and it''s "in the spirit" of how rails
extends the
core.

I don''t think you will find the reverse anywhere as the implementation 
is trivial

irb(main):001:0> require ''rubygems''
=> true
irb(main):002:0> gem ''activesupport''
=> true
irb(main):003:0> require ''active_support''
=> true
irb(main):004:0> module ActiveSupport::CoreExtensions::Numeric::Bytes
irb(main):005:1> def to_megabytes
irb(main):006:2> self/1.megabyte
irb(main):007:2> end
irb(main):008:1> end
=> nil
irb(main):009:0> num = 6.megabytes
=> 6291456
irb(main):010:0> num.to_megabytes
=> 6

HTH.

ilan
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Adam Cohen

2007-Jul-27 21:40 UTC

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Re: Number formatter

You can use number_to_human_size(size, precision=1) from
ActionView::Helpers::NumberHelper
(http://api.rubyonrails.org/classes/ActionView/Helpers/NumberHelper.html#M000524)

Adam

On 7/27/07, Ilan Berci
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> tobyclemson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
>
> > I could write something to do it but I wondered if there was an easier
> > way?
> >
> > Also if I did write a class to deal with it where in the rails
> > directory structure should it go? helpers?
> >
> > Thanks,
> > Toby
>
> I would just stick in in the core extensions as it''s very unlikely
to
> conflict with anything and it''s "in the spirit" of how
rails extends the
> core.
>
> I don''t think you will find the reverse anywhere as the
implementation
> is trivial
>
> irb(main):001:0> require ''rubygems''
> => true
> irb(main):002:0> gem ''activesupport''
> => true
> irb(main):003:0> require ''active_support''
> => true
> irb(main):004:0> module ActiveSupport::CoreExtensions::Numeric::Bytes
> irb(main):005:1> def to_megabytes
> irb(main):006:2> self/1.megabyte
> irb(main):007:2> end
> irb(main):008:1> end
> => nil
> irb(main):009:0> num = 6.megabytes
> => 6291456
> irb(main):010:0> num.to_megabytes
> => 6
>
> HTH.
>
> ilan
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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Gavin Kistner

2008-Nov-12 18:31 UTC

head link

Re: Number formatter

tobyclemson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
wrote:> Does anyone know if the reverse of the rails 20.kilobytes (megabytes/
> gigabytes etc.) exists? I have lots of values in my model that are
> stored as bytes and I''d like to easily convert them to a MB or GB
> approximation (say 1 decimal place) with *B as a suffix after the
> number.
This reply is over a year old, but I thought I''d archive the
information
in this thread.

While ActionView in rails does have a helper for this, it requires you 
to supply the number of decimal places. What follows is my own code (as 
a Ramaze helper) that (by default) automatically determines the number 
of decimal places based on the size of the answer.

For example:
[ 1500 12_000 130_000 1_400_000 ].each do |bytes|
  puts nice_bytes( b )
end
#=> 1.46kB
#=> 11.7kB
#=> 127kB
#=> 1.34MB

module Ramaze::Helper::NiceBytes
  K = 2.0**10
  M = 2.0**20
  G = 2.0**30
  T = 2.0**40
  def nice_bytes( bytes, max_digits=3 )
    value, suffix, precision = case bytes
      when 0...K
        [ bytes, ''b'', 0 ]
      else
        value, suffix = case bytes
          when K...M : [ bytes / K, ''kB'' ]
          when M...G : [ bytes / M, ''MB'' ]
          when G...T : [ bytes / G, ''GB'' ]
          else         [ bytes / T, ''TB'' ]
        end
        used_digits = case value
          when   0...10   : 1
          when  10...100  : 2
          when 100...1000 : 3
        end
        leftover_digits = max_digits - used_digits
        [ value, suffix, leftover_digits > 0 ? leftover_digits : 0 ]
    end
    "%.#{precision}f#{suffix}" % value
  end
end
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Michael Hasenstein

2009-Feb-12 10:46 UTC

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Re: Number formatter

Gavin Kistner wrote:> While ActionView in rails does have a helper for this, it requires you 
> to supply the number of decimal places. What follows is my own code (as 
> a Ramaze helper) that (by default) automatically determines the number 
> of decimal places based on the size of the answer.

I just found this thread an Rails'' number_to_human_size does exactly 
what you want as far as I can see, so there is no need to write your own 
function it seems?

http://api.rubyonrails.org/classes/ActionView/Helpers/NumberHelper.html#M001656
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Gavin Kistner

2009-Feb-13 02:50 UTC

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Re: Number formatter

Michael Hasenstein wrote:> Gavin Kistner wrote:
>> While ActionView in rails does have a helper for this, it requires you 
>> to supply the number of decimal places. What follows is my own code (as
>> a Ramaze helper) that (by default) automatically determines the number 
>> of decimal places based on the size of the answer.
> 
> 
> I just found this thread an Rails'' number_to_human_size does
exactly
> what you want as far as I can see, so there is no need to write your own 
> function it seems?
> 
>
http://api.rubyonrails.org/classes/ActionView/Helpers/NumberHelper.html#M001656
If you read the part of what I wrote that you quoted again, I think 
you''ll find that Rails'' method does not do the same thing when
no
precision parameter is supplied.
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Michael Hasenstein

2009-Feb-13 08:32 UTC

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Re: Number formatter

> If you read the part of what I wrote that you quoted again, I think 
> you''ll find that Rails'' method does not do the same thing
when no
> precision parameter is supplied.
So what is so difficult or bad about giving it that one parameter 
:precision => 2 that you feel you have to roll your own lengthy 
function?

I still don''t understand, but I would like to.
-- 
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Michael Hasenstein

2009-Feb-13 08:38 UTC

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Re: Number formatter

Michael Hasenstein wrote:> I still don''t understand, but I would like to.
Okay, now I do. But I still think a new function is not necessary. The 
only difference in behavior without the precision parameter is that the 
Rails function defaults to 1. Output of your example using the Rails 
function:

1.5 KB (your function: 1.46)
11.7 KB
127 KB
1.3 MB (your function: 1.34)

That looks very acceptable to me and a lot of people. Of course, do what 
you want, the only reason I post is because when *I* found this thread 
looking for such a functionality I copied your code, and only then 
realized there''s a function already. I respond to let others know right
away who find this through Google.
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Gavin Kistner

2009-Feb-13 14:38 UTC

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Re: Number formatter

Michael Hasenstein wrote:> That looks very acceptable to me and a lot of people. Of course, do what 
> you want, the only reason I post is because when *I* found this thread 
> looking for such a functionality I copied your code, and only then 
> realized there''s a function already. I respond to let others know
right
> away who find this through Google.
I think it''s excellent that you recorded for the record the simplest 
case for others to follow. To be clear, here''s the output I want (and 
have):

[ 1, 12, 123, 1234, 12345, 123456, 1234567, 12345678, 123456789, 
1234567890 ].each{ |bytes|
  puts nice_bytes( bytes )
}

#=> 1b
#=> 12b
#=> 123b
#=> 1.21kB
#=> 12.1kB
#=> 121kB
#=> 1.18MB
#=> 11.8MB
#=> 118MB
#=> 1.15GB

With the exception of bytes, I get two decimal places when there are 
less than 10 of the amount, one decimal place with less than a hundred, 
and no decimal places for hundreds. Windows does this, and I actually 
like it. Although unrelated to real significant figures, it''s similar: 
there are ~always 3 digits displayed. As the number grows in magnitude, 
I am less interested in the details of the exact decimals.

When working with a large number of files all in the same rough range, 
this lets me automatically visually display them in a way that allows 
them to be compared and distinguished, without too much detail.

*shrug*

Not a big deal. As you say, most people will find the rails method suits 
their needs.

BTW, here''s updated 1.9 compatible code for the function:
K = 2.0**10
M = 2.0**20
G = 2.0**30
T = 2.0**40
def nice_bytes( bytes, max_digits=3 )
  value, suffix, precision = case bytes
    when 0...K
      [ bytes, ''b'', 0 ]
    else
      value, suffix = case bytes
        when K...M then [ bytes / K, ''kB'' ]
        when M...G then [ bytes / M, ''MB'' ]
        when G...T then [ bytes / G, ''GB'' ]
        else            [ bytes / T, ''TB'' ]
      end
      used_digits = case value
        when   0...10   then 1
        when  10...100  then 2
        when 100...1000 then 3
      end
      leftover_digits = max_digits - used_digits
      [ value, suffix, leftover_digits > 0 ? leftover_digits : 0 ]
  end
  "%.#{precision}f#{suffix}" % value
end
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Gavin Kistner

2009-Feb-13 14:41 UTC

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Re: Number formatter

Gavin Kistner wrote:> #=> 1b
> #=> 12b
> #=> 123b
[...]
>       [ bytes, ''b'', 0 ]
Ack! That''s twice now that I''ve pasted code in there with the
incorrect
lowercase ''b'' for bytes. Should be:
[ bytes, ''B'', 0 ]
and thus
#=> 1B
#=> 12B
#=> 123B
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Gavin Kistner

2009-Feb-13 14:54 UTC

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Re: Number formatter

Bah. One, final, 1.9-compatible post that also handles the edge case of 
values in the range 1000...1024 of a value correctly.

K = 2.0**10
M = 2.0**20
G = 2.0**30
T = 2.0**40
def nice_bytes( bytes, max_digits=3 )
  value, suffix, precision = case bytes
    when 0...K
      [ bytes, ''b'', 0 ]
    else
      value, suffix = case bytes
        when K...M then [ bytes / K, ''kB'' ]
        when M...G then [ bytes / M, ''MB'' ]
        when G...T then [ bytes / G, ''GB'' ]
        else            [ bytes / T, ''TB'' ]
      end
      used_digits = case value
        when   0...10   then 1
        when  10...100  then 2
        when 100...1024 then 3
      end
      leftover_digits = max_digits - used_digits
      [ value, suffix, leftover_digits > 0 ? leftover_digits : 0 ]
  end
  "%.#{precision}f#{suffix}" % value
end

[ 1, 12, 123, 1022, 1024,
  1234, 12345, 123456, 2**19.99, 2**20,
  1234567, 12345678, 123456789,
  1234567890
].each{ |bytes| puts nice_bytes( bytes ) }

#=> 1b
#=> 12b
#=> 123b
#=> 1022b
#=> 1.00kB
#=> 1.21kB
#=> 12.1kB
#=> 121kB
#=> 1017kB
#=> 1.00MB
#=> 1.18MB
#=> 11.8MB
#=> 118MB
#=> 1.15GB
-- 
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Michael Hasenstein

2009-Feb-13 21:19 UTC

head link

Re: Number formatter

Gavin Kistner wrote:> Bah. One, final, 1.9-compatible post that also handles the edge case of 
> values in the range 1000...1024 of a value correctly.

Thanks for the effort!

Why don''t you submit it to Rails so that they replace their version
with
yours?
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Rails - Jul 2007 - Number formatter

Number formatter

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