scala - How can I map a case class with non-default field types to a table in Slick? -


i can mapping case class slick database table:-

case class sometimestamp(id: option[long], timestamp: java.sql.timestamp )  class timestamptable(tag: tag) extends table[sometimestamp](tag, "tstamp_table") {   def id    = column[long]("id", o.autoinc, o.primarykey)   def time  = column[java.sql.timestamp]("time")    def * = (id.?, time) <> (sometimestamp.tupled, sometimestamp.unapply) }

the case class has fields converted database types default slick, well.

but doesn't work, if field in case class not default database type. slick allows me provide implicit conversion , valid database type using mappedcolumntype, tried this, notice use java localdatetime thather sql timestamp.

case class somelocaldate(id: option[long], timestamp: java.time.localdatetime )  class localdatetable(tag: tag) extends table[somelocaldate](tag, "tldate_table") { import localdatetable._   def id    = column[long]("id", o.autoinc, o.primarykey)   def time  = column[java.time.localdatetime]("time")    def * = (id.?, time) <> (somelocaldate.tupled, somelocaldate.unapply) }  object localdatetable {   implicit val localdatetimetotimestamp = mappedcolumntype.base[localdatetime, timestamp](     { timestamp.valueof(_) } ,     { ts => ts.tolocaldatetime }   ) }

i have added , implicit mapped column still compile error in projection , implicit resolution compile error is:-

[info] compiling 1 scala source ...target/scala-2.11/classes... [error] db/tables.scala:92: not find implicit value parameter tt: slick.ast.typedtype[java.time.localdatetime] [error]   def time: rep[localdatetime]  = column[java.time.localdatetime]("time")

if modify def time , add type ascription different error, see below.

case class somelocaldate(id: option[long], timestamp: java.time.localdatetime )  class localdatetable(tag: tag) extends table[somelocaldate](tag, "tldate_table") { import localdatetable._   def id    = column[long]("id", o.autoinc, o.primarykey)   def time: rep[localdatetime]  = column[java.time.localdatetime]("time")    def * = (id.?, time) <> (somelocaldate.tupled, somelocaldate.unapply) }  object localdatetable {   implicit val localdatetimetotimestamp = mappedcolumntype.base[localdatetime, timestamp](     { timestamp.valueof(_) } ,     { ts => ts.tolocaldatetime }   ) }

gives error:-

[info] compiling 1 scala source ...target/scala-2.11/classes... [error] db/tables.scala:92: not find implicit value parameter tt: slick.ast.typedtype[java.time.localdatetime] [error]   def time: rep[localdatetime]  = column[java.time.localdatetime]("time") [error]                                                                  ^ [error]db/tables.scala:94: no matching shape found. [error] slick not know how map given types. [error] possible causes: t in table[t] not match * projection. or use unsupported type in query (e.g. scala list). [error]   required level: slick.lifted.flatshapelevel [error]      source type: (slick.lifted.rep[option[long]], slick.lifted.rep[java.time.localdatetime]) [error]    unpacked type: (option[long], java.time.localdatetime) [error]      packed type: [error]   def * = (id.?, time) <> (somelocaldate.tupled, somelocaldate.unapply) [error]                        ^ [error] 2 errors found

what have map case class table if case class not have default supported database types (eg localdatetime) ?

cheers

after days of struggling found answer :-/

the problem implicit mappedcolumntype declared after table class. reason upset implicit resolution though imported above table.

i found answer when removed case class , used tuples. when did following error presented

[info] compiling 1 scala source target/scala-2.11/classes... [error] /db/tables.scala:100: not find implicit value parameter tt: slick.ast.typedtype[java.time.localdatetime] [error]   def time: rep[localdatetime]  = column[java.time.localdatetime]("time") [error]                                                                  ^ [error] /db/tables.scala:102: type mismatch; [error]  found   : (slick.lifted.rep[option[long]], slick.driver.h2driver.api.rep[java.time.localdatetime]) [error]     (which expands to)  (slick.lifted.rep[option[long]], slick.lifted.rep[java.time.localdatetime]) [error]  required: slick.lifted.provenshape[(option[long], java.time.localdatetime)] [error]  note: implicit value localdatetimetotimestamp not applicable here because comes after application point , lacks explicit result type [error]   def * : provenshape[(option[long], localdatetime)] = (id.?, time) [error]                                                        ^

so clear solution put implicit conversion above table definition if in same file or put in file , import it, see working solution below. thanks.

case class somelocaldate(id: option[long], timestamp: java.time.localdatetime )  object localdatetableconversions {   implicit val localdatetimetotimestamp = mappedcolumntype.base[localdatetime, timestamp](     { timestamp.valueof(_) } ,     { ts => ts.tolocaldatetime }   ) } import localdatetableconversions._  class localdatetable(tag: tag) extends table[somelocaldate](tag, "tldate_table") {   def id    = column[long]("id", o.autoinc, o.primarykey)   def time: rep[localdatetime]  = column[java.time.localdatetime]("time")    def * = (id.?, time) <> (somelocaldate.tupled, somelocaldate.unapply) }

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