17 lines
610 B
Ruby
17 lines
610 B
Ruby
class AddUniqueIndexToIssueRelations < ActiveRecord::Migration
|
|
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.delete_all(["id = ?", i])
|
|
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
|