--- /dev/null
+class AddUniqueIndexOnMembers < ActiveRecord::Migration
+ def self.up
+ # Reassign MemberRole rows if needed
+ MemberRole.update_all("member_id =" +
+ " (SELECT min(m2.id) FROM #{Member.table_name} m1, #{Member.table_name} m2" +
+ " WHERE m1.user_id = m2.user_id AND m1.project_id = m2.project_id" +
+ " AND m1.id = #{MemberRole.table_name}.member_id)")
+ # Remove duplicates
+ Member.connection.select_values("SELECT m.id FROM #{Member.table_name} m" +
+ " WHERE m.id > (SELECT min(m1.id) FROM #{Member.table_name} m1 WHERE m1.user_id = m.user_id AND m1.project_id = m.project_id)").each do |i|
+ Member.delete_all(["id = ?", i])
+ end
+
+ # Then add a unique index
+ add_index :members, [:user_id, :project_id], :unique => true
+ end
+
+ def self.down
+ end
+end