Scala Slick联接查询

Question

I'm performing a join in slick like so:

 val query = for { 
          o <- Orders if o.id === order_id
          p <- o.part_key
        } yield (o,p)
        query.list

which creates the following error message:

value list is not a member of org.scalaquery.ql.Query[(code.model.Orders.type, code.model.Parts.type)]

If I just return an Order or Part the query works fine:

 val query = for { 
          o <- Orders if o.id === order_id
          p <- o.part_key
        } yield o
        query.list

How can I return a list of tuple from a slick join query? Why am I getting the error message above?

Answer 1

I think that the best way for you to return a tuple in the query is to use:

val list = (for { 
      o <- Orders if o.id === order_id
      p <- o.part_key
    } yield o ~ p).list