How to add AND to the join SLICK

playframework, scala, scalaquery, slick

Solution

EDIT The OP is looking for chained on conditions in a join of 2 table objects.

This should compile:

val q = for{
  r <- Readings
  Join(p,s) <- Params leftJoin Sensors on (
    (a,b)=> (a.id is b.parameter_id) && (b.reading_id is r.id)
  )
} yield(r,p,s)

ORIGINAL Try something like this:

val q = for{
  Join(p,s) <- Params leftJoin Sensors on (_.id is s.parameter_id)
  r <- Readings if s.reading_id is r.id
} yield(r,p,s)

val result = 
  q.list.map{ case(r,p,s)=>
    SomeCaseClass(r,p,s)
  }

Problem

I have the problem writing query in SLICK Here is my request to MySql database: ``` SELECT * FROM readings AS r JOIN parameters AS p LEFT JOIN sensorvalues AS sv ON sv.parameter_id=p.id AND sv.reading_id=r.id ``` How can I write it using SLICK ? It is really lack of info on joins in docs. UPDATE 1 I tried all the combinations even one like this ``` val q = for{ Join(p,sv) <- Parameters leftJoin SensorValues on (_.id is sv.parameter_id) r <- Readings if sv.reading_id is r.id } yield(r,p,sv) ``` In this case compiler gives me an error `wrong number of parameters; expected = 2` So I replaced sv.parameter_id to _.parameter_id and now it argues about Join It said that: `constructor cannot be instantiated to expected type; found : models.Join required: (models.Parameters.type, models.SensorValues.type)` I'm using last version of SLICK and it's deprecated. I manually imported `import scala.slick.lifted.Join` and now it looks like it's regular innerJoin because it uses WHERE instead of putting and after ON. SQL generated buy query: `select x2.id, x2.platform_id, x2.date, x3.x4, x3.x5, x3.x6, x7.x8, x7.x9, x7.x10, x7.x11 from (select x12.id as x4, x12.name as x5, x12.units as x6 from parameters x12) x3 left outer join (select x13.id as x8, x13.reading_id as x9, x13.parameter_id as x10, x13.value as x11 from sensorValues x13) x7 on x3.x4 = x7.x10, readings x2 where true and (x7.x9 = x2.id)` Even this one would be good with added condition to the ON section ``` val readings = for { all <-Readings join Parameters leftJoin SensorValues on (_._2.id is _.parameter_id) if(all._1._1.id === all._2.reading_id) } yield (all._1._1,all._1._2,all._2) ``` But this never hapens. ``` SELECT x2.x3, x2.x4, x2.x5, x2.x6, x2.x7, x2.x8, x9.x10, x9.x11, x9.x12, x9.x13 FROM ( SELECT x14.x15 AS x3, x14.x16 AS x4, x14.x17 AS x5, x18.x19 AS x6, x18.x20 AS x7, x18.x21 AS x8 FROM ( SELECT x22.`id` AS x15, x22.`platform_id` AS x16, x22.`date` AS x17 FROM `readings` x22 )x14 INNER JOIN( SELECT x23.`id` AS x19, x23.`name` AS x20, x23.`units` AS x21 FROM `parameters` x23 )x18 )x2 LEFT OUTER JOIN( SELECT x24.`id` AS x10, x24.`reading_id` AS x11, x24.`parameter_id` AS x12, x24.`value` AS x13 FROM `sensorValues` x24 )x9 ON x2.x6 = x9.x12 WHERE x2.x3 = x9.x11 ``` instead `WHERE` I need `AND`. What Should I use to mention this condition or there is no functionality in slick for that?

Original source