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class AddIssuesNestedSetsColumns < ActiveRecord::Migration[4.2]
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
Issue.update_all("parent_id = NULL, root_id = id, lft = 1, rgt = 2")
end
def self.down
remove_column :issues, :parent_id
remove_column :issues, :root_id
remove_column :issues, :lft
remove_column :issues, :rgt
end
end
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