Redmine

class AddIssuesNestedSetsColumns < ActiveRecord::Migration

  def self.up

    #add_column :issues, :parent_id, :integer, :default => nil

    add_column :issues, :root_id, :integer, :default => nil

    #add_column :issues, :lft, :integer, :default => nil

    #add_column :issues, :rgt, :integer, :default => nil

    issues=Issue.find(:all)

    args_to_save=Array.new

    say("Issues found: #{issues.size.to_s}")

    issues.each do |issue|

            if issue.parent_id == nil

                    args=Hash.new

                    args[:parent_id]=0

                    args[:id]=issue.id

                    args[:root_id]=issue.id

                    r=issue.rgt

                    l=issue.lft

                    if (r-l) > 1

                            children=issues.select do |i|

                                    true if i.id != issue.id && i.lft > l && i.rgt < r

                            end

                            children.each do |c|

                                    c_args=Hash.new

                                    c_args[:id]=c.id

                                    c_args[:root_id]=issue.id

                                    c_args[:lft]=c.lft-(l-1)

                                    c_args[:rgt]=c.rgt-(l-1)

                                    c_args[:parent_id]=c.parent_id

                                    args_to_save << c_args

                            end

                            args[:rgt]=issue.rgt-(l-1)

                            args[:lft]=1

                    else

                            args[:rgt]=2

                            args[:lft]=1

                    end

                    args_to_save << args

            end

    end

    issues.clear()

    say("Total of #{args_to_save.size.to_s} issues will be affected")

    say_with_time "Migrating issues from IssuesGroup plugin" do

                        args_to_save.each_with_index do |a,idx|

                                say("Issues processed so far: #{idx.to_s}") if (idx > 0 && idx%1000 == 0)

                                update_str="parent_id = #{( a[:parent_id] == 0 ? "NULL" : a[:parent_id].to_s)}, root_id = #{a[:root_id].to_s}, lft = #{a[:lft].to_s}, rgt = #{a[:rgt].to_s}"

                                Issue.update_all(update_str,"id = #{a[:id].to_s}")

                        end

    end

    #Issue.update_all("parent_id = NULL, root_id = id, lft = 1, rgt = 2")

    #Issue.update_all("root_id = id")

  end

  def self.down

          raise ActiveRecord::IrreversibleMigration, "Can't roll back parent information"

    #remove_column :issues, :parent_id

    #remove_column :issues, :root_id

    #remove_column :issues, :lft

    #remove_column :issues, :rgt

  end

end