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class AddUniqueIndexToIssueRelations < ActiveRecord::Migration[4.2]
def self.up
# Remove duplicates
IssueRelation.connection.select_values("SELECT r.id FROM #{IssueRelation.table_name} r" +
" WHERE r.id > (SELECT min(r1.id) FROM #{IssueRelation.table_name} r1 WHERE r1.issue_from_id = r.issue_from_id AND r1.issue_to_id = r.issue_to_id)").each do |i|
IssueRelation.where(["id = ?", i]).delete_all
end
add_index :issue_relations, [:issue_from_id, :issue_to_id], :unique => true
end
def self.down
remove_index :issue_relations, :column => [:issue_from_id, :issue_to_id]
end
end
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