How to get all "issues from" or "issues to" a particular issue (passed on parameter)

Redmine_get_issues_relations_from_issue.rb

def get_issues_relations_from_issue(issue)
    relations = IssueRelation.find(:all, :include => [ :issue_from, :issue_to ],
                                   :conditions => [ 'issue_from_id = ' + issue.id.to_s + ' or issue_to_id = ' + issue.id.to_s])
    relations.each do |relation|
        if relation.issue_from_id == issue.id
            puts "From issue" + issue.id.to_s + " -> " + issue.id.to_s + " " + relation.relation_type + " " + relation.issue_to_id.to_s
        elsif relation.issue_to_id == issue.id
            puts "To issue " + issue.id.to_s + " -> " + relation.issue_from_id.to_s + " " + relation.relation_type + " " + issue.id.to_s
        end
    end
end