Help on loop

Rails
1

Hey,

I have got a script that returns a long list of font family names, which
I all want to store in a variable (array). I tried doing this with @f =
font.family also in the for loop below but it only prints the last item
when I want to display the results.

require ‘rubygems’
require ‘RMagick’
include Magick

for font in Magick.fonts
puts font.family
end

Any suggestions?

Cheers

2

Try this:

families = Magick.fonts.map{|f| f.family}

On Nov 7, 9:48 am, Rajeev K. [email protected]

3

Thanks mate I managed to find a way:

a = []

Magick.fonts do |font|
a << font.family
end

puts a[29]

But your one liner works too :slight_smile:

Cheers

ebeard wrote:

Try this:

families = Magick.fonts.map{|f| f.family}

On Nov 7, 9:48 am, Rajeev K. [email protected]

4

On Nov 7, 2007 9:48 AM, Rajeev K. [email protected]
wrote:

require ‘RMagick’
include Magick

for font in Magick.fonts
puts font.family
end

Using

@f = font.family

will overwrite @f each time through the loop. That’s why you see only
the last value.

If you wanted to build up an array, you could write:

@f = []
for font in Magick.fonts
@f << font.family
end

But you can do this all in one line:

@f = Magick.fonts.collect &:family

(I’m assuming you’re doing this in a Rails app. If you’re doing it in
a standalone script, you would need to add “require ‘active_support’”
for the &:family thingy to work)

This is equivalent to what ebeard showed, but uses some new sugar
Rails gives you. See
http://pragdave.pragprog.com/pragdave/2005/11/symbolto_proc.html. I
think this is going to be standard in Ruby 1.9.

5

Something like this maybe?

<%= select(“SomeModel”, “SomeAttribute”, @f {|f| [ f ] }), :prompt =>
“Select a font” %>

On Nov 7, 11:06 am, Rajeev K. [email protected]

6

Thanks for that Bob got it working. I got another question the names I
have stored in my array I want to display them as a drop down menu.
Basically I want something like the code below, but the array contains
hundreds of names so entering them all manually would be wasting my
time.

Select a font ---------------------- 
    <option value="Verdana">Verdana</option>

    <option value="Times New Roman">Times New Roman</option>
Arial Zrnic .........

Cheers

Bob S. wrote:

On Nov 7, 2007 9:48 AM, Rajeev K. [email protected]
wrote:

require ‘RMagick’
include Magick

for font in Magick.fonts
puts font.family
end

Using

@f = font.family

will overwrite @f each time through the loop. That’s why you see only
the last value.

If you wanted to build up an array, you could write:

@f = []
for font in Magick.fonts
@f << font.family
end

But you can do this all in one line:

@f = Magick.fonts.collect &:family

(I’m assuming you’re doing this in a Rails app. If you’re doing it in
a standalone script, you would need to add “require ‘active_support’”
for the &:family thingy to work)

This is equivalent to what ebeard showed, but uses some new sugar
Rails gives you. See
http://pragdave.pragprog.com/pragdave/2005/11/symbolto_proc.html. I
think this is going to be standard in Ruby 1.9.

7

Guys … put this in a helper … littering your views with procedural
code. Will be difficult to maintain.

On Nov 7, 4:44 pm, Rajeev K. [email protected]

8

I attempted your way but couldn’t get it to work. I came up with
something like this:

Select a font ----------------------

<% @families = Magick.fonts.map{|f| f.family} %>
<% for families in @families %>

<%= families %> <% end %>

Seems to work fine so cant really complain.

Cheers

ebrad wrote:

Something like this maybe?

<%= select(“SomeModel”, “SomeAttribute”, @f {|f| [ f ] }), :prompt =>
“Select a font” %>

On Nov 7, 11:06 am, Rajeev K. [email protected]