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- class AddUniqueIndexOnMembers < ActiveRecord::Migration
- def self.up
- # Clean and reassign MemberRole rows if needed
- MemberRole.delete_all("member_id NOT IN (SELECT id FROM #{Member.table_name})")
- 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
- remove_index :members, [:user_id, :project_id]
- end
- end
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