I do not understand what is wrong with my filter (inferred type arguments [Boolean] do not conform..

[Miuler]

Hi, I do not understand what is wrong

Code

...

    class Edifile(_tableTag: Tag) extends Table[EdifileRow](_tableTag, "edifile") {

    ...

    }

...

    lazy val Edifile = new TableQuery(tag => new Edifile(tag))

    db.withSession { implicit session =>

      val edifile = Edifile.filter(_.id == edifileId)

      println(edifile)

    }

...

Error

Error:(22, 29) inferred type arguments [Boolean] do not conform to method filter's type parameter bounds [T <: scala.slick.lifted.Column[_]]

      val edifile = Edifile.filter(_.id == edifileId)

                            ^

Error:(22, 41) type mismatch;

 found   : com.nextstar.b2b.entity.Tables.Edifile => Boolean

 required: com.nextstar.b2b.entity.Tables.Edifile => T

      val edifile = Edifile.filter(_.id == edifileId)

                                        ^

Error:(22, 35) Type T cannot be a query condition (only Boolean, Column[Boolean] and Column[Option[Boolean]] are allowed

      val edifile = Edifile.filter(_.id == edifileId)

                                  ^

What is the error? is not a simple filter with boolean?

[Marius Muja]

You need to use === instead of ==.

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[Miuler]

:O thanks

but it gave me this error:

  value === is not a member of Tables.profile.simple.Column[Long]

but after searching I found I had to add this:

  import scala.slick.driver.MySQLDriver.simple._

all sorted

Thanks :D

[Fayimora Femi-Balogun]

I had this problem few days ago and fixed it with ===. Unfortunately, I have run into it again, in a slightly different way.

The code in question is: problems.filter(p => ids.contains(p.id)).list

All i'm trying to do is select rows given a list of ids.

Any idea how to fix this?

Cheers

[Naftoli Gugenheim]

I think the slick syntax is p.id inSet ids.

 

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[Fayimora Femi-Balogun]

Thanks!

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Fayimora Femi-Balogun

Computer Science Student

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