Burndown graph internal error with closed issue

[cassianomonteiro]

The burndown graph is working fine with all issues opened. But as soon as I closed one issue, I got Internal Error 500. My log shows this:

Processing ScrumblerSprintsController#burndown (for 10.3.14.33 at 2012-07-04 14:32:26) [GET]
  Parameters: {"project_id"=>"epb-ipad", "action"=>"burndown", "id"=>"2", "controller"=>"scrumbler_sprints"}

ArgumentError (odd number of arguments for Hash):
  vendor/plugins/redmine_scrumbler/app/controllers/scrumbler_sprints_controller.rb:174:in `[]'
  vendor/plugins/redmine_scrumbler/app/controllers/scrumbler_sprints_controller.rb:174:in `burndown_calc'
  vendor/plugins/redmine_scrumbler/app/controllers/scrumbler_sprints_controller.rb:121:in `burndown'
  config/initializers/mongrel.rb:62:in `dispatch_cgi'

Rendering C:/webserver/Redmine/public/500.html (500 Internal Server Error)

I´m using Redmine 1.4.4, with Scrumbler commit 1d8002f (redmine 1.4.x support from may 2nd).
Ruby version: 1.8.7
Rails version: 2.3.14

Gem list:

*** LOCAL GEMS ***

actionmailer (2.3.14)
actionpack (2.3.14)
activerecord (2.3.14)
activeresource (2.3.14)
activesupport (2.3.14)
bundler (1.1.3)
cgi_multipart_eof_fix (2.5.0)
coderay (1.0.6)
fastercsv (1.5.5, 1.5.4)
gem_plugin (0.2.3)
i18n (0.4.2)
json (1.6.6, 1.6.3)
mongrel (1.1.5 x86-mingw32)
mongrel_service (0.3.4 i386-mswin32)
mysql (2.8.1 x86-mingw32)
net-ldap (0.3.1)
pg (0.13.2 x86-mingw32)
rack (1.1.3, 1.1.1)
rails (2.3.14)
rake (0.9.2.2, 0.8.7)
rdoc (3.12)
rmagick (2.13.1)
ruby-openid (2.1.8)
sqlite3 (1.3.6 x86-mingw32, 1.3.5 x86-mingw32)
tzinfo (0.3.33)
win32-service (0.5.2 mswin32)

[cassianomonteiro]

Turns out it was because of the ruby version 1.8.7. The Hash#[] method from 1.9.3 is able to take a 2-dimention array, but the one from 1.8.7 can´t do it.

I worked around that that by manually adding the items to the hash, as the code below (method burndown_calc, line 174). Sorry, but i´m not skilled with ruby, probably there is a much clever way to do it.

#    closed_issues = Hash[closed_issues.group_by(&:due_date).map {|k,v|
#      [k, v.inject(0.0) {|t,is|
#          t+= is.custom_value_for(ScrumblerIssueCustomField.points).try(:value).to_f }
#      ]}]

    closed_issues_array = closed_issues.group_by(&:due_date).map {|k,v|
      [k, v.inject(0.0) {|t,is|
          t+= is.custom_value_for(ScrumblerIssueCustomField.points).try(:value).to_f }
      ]}
    closed_issues = Hash.new
    closed_issues_array.each { |x| closed_issues[x[0]] = x[1] }