Scala timestamp/date zero argument constructor?

Question

Squeryl requires a zero argument constructor when using Option[] in fields. I realized how I could create such a constructor for Long like 0L but how do I create such a thing for a Timestamp or Date?

Essentially I need to finish this:

def this() = this(0L,"",TIMESTAMP,TIMESTAMP,0L,"","","","",Some(""),Some(""),"",DATE,DATE,false,false,false,Some(0L),Some(0),Some(0L))

Below is how I originally found the timestamp and date problem.

Background

Getting the following error in my Play! 2.0 Scala app (also using Squeryl):

Caused by: java.lang.RuntimeException: Could not deduce Option[] type of field 'startOrder' of class models.Job

This field in models.Job:

@Column("start_order")
var startOrder: Option[Int],

And in the Postgres DB it is defined as an integer. Is there different handling in Play! 2.0 of models, is this a bug, or is it a Squeryl problem? Thanks!

Stack trace, looks like Squeryl problem

Caused by: java.lang.RuntimeException: Could not deduce Option[] type of field 'startOrder' of class models.Job
        at scala.sys.package$.error(package.scala:27) ~[scala-library.jar:na]
        at scala.Predef$.error(Predef.scala:66) ~[scala-library.jar:0.11.2]
        at org.squeryl.internals.FieldMetaData$$anon$1.build(FieldMetaData.scala:441) ~[squeryl_2.9.1-0.9.4.jar:na]
        at org.squeryl.internals.PosoMetaData$$anonfun$3.apply(PosoMetaData.scala:111) ~[squeryl_2.9.1-0.9.4.jar:na]
        at org.squeryl.internals.PosoMetaData$$anonfun$3.apply(PosoMetaData.scala:80) ~[squeryl_2.9.1-0.9.4.jar:na]
        at scala.collection.immutable.HashMap$HashMap1.foreach(HashMap.scala:176) ~[scala-library.jar:0.11.2]

score 4 · Accepted Answer · answered Mar 28 '12 at 06:02

4

If startOrder is defined as

val startOrder: Option[java.sql.Timestamp]

in class definition. I believe,

Some(new java.sql.Timestamp(0))

should be passed to constructor.

answered Mar 28 '12 at 06:02

4e6

10,696
4
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Ah perfect, I figured `Some()` had to wrap it but I was confused on what it wrapped, thanks! – crockpotveggies Mar 28 '12 at 06:08

score 0 · Answer 2 · answered Mar 28 '12 at 05:39

0

Option is used when a value is optional, i.e. if there could be a value or not. Only if there is a value, you use Some wrapping it. But if there is no value, you use None.

answered Mar 28 '12 at 05:39

Heiko Seeberger

3,702
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Scala timestamp/date zero argument constructor?

2 Answers2