Puppet users - Sep 2012 - How to remove last comma when iterating through hash in erb template

I need to produce a line in a config file in the format x =
"ip1,ip2,ip3"

I am using the method below to sort the hash before iterating over it. 
However, as you can see there will always be a final comma which breaks the 
app that uses this config file. Does anyone know how I could remove the 
final comma?

ipv4_bind_addresses = "<% routes.sort_by {|key, v| key}.each do |key, v|
-%><%= net %>.<%= v[''pubnet''] %>.1,<% end
-%>"

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I use this:

<%= relay_destinations.join('','') %>


On Sep 10, 2012, at 1:22 PM, JeremyCampbell <jeremycampbell87@gmail.com>
wrote:
> I need to produce a line in a config file in the format x =
"ip1,ip2,ip3"
> 
> I am using the method below to sort the hash before iterating over it.
However, as you can see there will always be a final comma which breaks the app
that uses this config file. Does anyone know how I could remove the final comma?
> 
> ipv4_bind_addresses = "<% routes.sort_by {|key, v| key}.each do
|key, v| -%><%= net %>.<%= v[''pubnet'']
%>.1,<% end -%>"
> 
> 
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----- Original Message -----
> From: "JeremyCampbell" <jeremycampbell87@gmail.com>
> To: puppet-users@googlegroups.com
> Sent: Monday, September 10, 2012 6:22:17 PM
> Subject: [Puppet Users] How to remove last comma when iterating through
hash in erb template
> 
> I need to produce a line in a config file in the format x >
"ip1,ip2,ip3"
> 
> I am using the method below to sort the hash before iterating over
> it. However, as you can see there will always be a final comma which
> breaks the app that uses this config file. Does anyone know how I
> could remove the final comma?
> 
> ipv4_bind_addresses = "<% routes.sort_by {|key, v| key}.each do
|key,
> v| -%><%= net %>.<%= v[''pubnet'']
%>.1,<% end -%>"

the key is to go via an array and then use join:

ipv4_bind_addresses = "<%= routes.sort_by {|key, v| key}.map{|key, v|
''%s.%s.1'' % [net,
v[''pubnet'']]}.join('','') -%>"

not seeing your data so it''s hard to test if this will work for you but
the ''map'' method takes the block and returns an array of each
iteration
of the block - strings in this case.  Calling join on the strings will 
then avoid the trailing ,

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On Monday, September 10, 2012 7:28:58 PM UTC+2, R.I. Pienaar
wrote:
>
>
>
> ----- Original Message ----- 
> > From: "JeremyCampbell" <jeremyca...@gmail.com
<javascript:>>
> > To: puppet...@googlegroups.com <javascript:> 
> > Sent: Monday, September 10, 2012 6:22:17 PM 
> > Subject: [Puppet Users] How to remove last comma when iterating
through
> hash in erb template 
> > 
> > I need to produce a line in a config file in the format x = 
> > "ip1,ip2,ip3" 
> > 
> > I am using the method below to sort the hash before iterating over 
> > it. However, as you can see there will always be a final comma which 
> > breaks the app that uses this config file. Does anyone know how I 
> > could remove the final comma? 
> > 
> > ipv4_bind_addresses = "<% routes.sort_by {|key, v| key}.each
do |key,
> > v| -%><%= net %>.<%= v[''pubnet'']
%>.1,<% end -%>"
>
>
> the key is to go via an array and then use join: 
>
> ipv4_bind_addresses = "<%= routes.sort_by {|key, v| key}.map{|key,
v|
> ''%s.%s.1'' % [net,
v[''pubnet'']]}.join('','') -%>"
>
> not seeing your data so it''s hard to test if this will work for
you but
>> the ''map'' method takes the block and returns an array
of each iteration
>> of the block - strings in this case.  Calling join on the strings will 
>> then avoid the trailing , 
>>
> Thats worked perfectly! Dankie meneer!
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