I like to call this the DRAPES principle: Don't Repeat Another Person's
Existing Software. =) Good find.
Tom
[EMAIL PROTECTED] wrote:
Everyone,
This may or may not be a repeat (my last message didn't reach the
group). Basically, Tom's solution solves the problem, but the same
solution is in a collection called Core Extensions for Ruby, which is
just awesome. The method that acts_as_toms (i crack myself up) is
'partition_by' which is an extension to Enumerable.
To install the extensions: `gem install -r extensions`
To use the extensions add this to your 'environment.rb' file: "require
'extensions/all'"
Imagine the following:
## CONTROLLER
updates = Update.find :all # has the attribute date
grouped_updates = updates.partition_by {|u| u.date} # this will group
updates by date
## VIEW
<% grouped_updates.each_pair do |date,updates| -%>
<h3><%= date.to_s %></h3>
<% updates.each do |update| -%>
<!-- your display code for updates -->
<% end -%>
<% end -%>
##
Use extensions, they kick ass!
-Jordan
On 11/22/2006, "Tom Werner" <[EMAIL PROTECTED]> wrote:
Here's a little group method I just wrote on the Array class (and how to
use it) that might serve your purpose well:
class Array
def group
groups = {}
self.each do |e|
key = yield e
groups[key] ||= []
groups[key] << e
end
groups
end
end
class Foo
attr_accessor :year, :title
def initialize(year, title)
self.year = year
self.title = title
end
end
a = []
a << Foo.new(2006, 'Alpha')
a << Foo.new(2006, 'Beta')
a << Foo.new(2007, 'Gamma')
a << Foo.new(2008, 'Delta')
ag = a.group { |e| e.year }
ag.keys.sort.each do |year|
puts year
ag[year].each do |foo|
puts ' ' + foo.title
end
end
__END__
2006
Alpha
Beta
2007
Gamma
2008
Delta
_______________________________________________
Sdruby mailing list
[email protected]
http://lists.sdruby.com/mailman/listinfo/sdruby
_______________________________________________
Sdruby mailing list
[email protected]
http://lists.sdruby.com/mailman/listinfo/sdruby
_______________________________________________
Sdruby mailing list
[email protected]
http://lists.sdruby.com/mailman/listinfo/sdruby
