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class AddIssuesNestedSetsColumns < ActiveRecord::Migration
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def self.up
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add_column :issues, :parent_id, :integer, :default => nil
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add_column :issues, :root_id, :integer, :default => nil
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add_column :issues, :lft, :integer, :default => nil
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add_column :issues, :rgt, :integer, :default => nil
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Issue.update_all("parent_id = NULL, root_id = id, lft = 1, rgt = 2")
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# when the database already used redmine_subtasks plugin
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if ['parent_id','lft','rgt'].all? {|c| Issue.column_names.include?(c) }
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add_column :issues, :root_id, :integer, :default => nil
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Issue.reset_column_information
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Issue.update_all("parent_id = NULL, root_id = id, lft = 1, rgt = 2", "parent_id IS NULL")
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Issue.find_by_sql("SELECT t1.* FROM issues t1 LEFT JOIN issues t2 ON t1.lft BETWEEN t2.lft AND t2.rgt WHERE t1.parent_id is not null GROUP BY t1.id ORDER BY count(t2.id)").each do |issue|
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issue.update_attribute(:parent_issue_id, issue.parent_id)
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end
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else
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add_column :issues, :parent_id, :integer, :default => nil
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add_column :issues, :root_id, :integer, :default => nil
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add_column :issues, :lft, :integer, :default => nil
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add_column :issues, :rgt, :integer, :default => nil
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Issue.update_all("parent_id = NULL, root_id = id, lft = 1, rgt = 2")
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end
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end
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def self.down
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