Case class (with companion object) in method declaration evaluated as Any
1
I have an issue with a case class + companion object and (possibly) its interaction with Play. Whenever i try to pass it as an argument for a method, it is interpreted as being of type any instead of EventList. Using it in a method body works perfectly, however.
I can't seem to understand why. Below is a simplified segment of the code in question (it comes from a large code base).
EventList.scala:
package v1.objects
final case class EventList( ... ) {
...
}
object EventList {
def apply( ... ): EventList = {
...
new EventList( ... )
}
}
ObjectRepository.scala:
package v1.objects
class ObjectExecutionContext @Inject()(actorSystem: ActorSystem) extends CustomExecutionContext(actorSystem, "repository.dispatcher")
trait ObjectRepository {
def patch(newEvents: EventList)(implicit mc: MarkerContext): Future[Int]
...
}
@Singleton
class ObjectRepositoryImpl @Inject()()(implicit ec: ObjectExecutionContext) extends ObjectRepository {
override def patch(newEvents: EventList)(implicit mc: MarkerContext): Future[Int] = {
...
var eventList = EventList(...) // Retreive the old events from DB, works fine
eventList = EventList(eventList.underlying :+ newEvents.underlying) // <- This fails! newEvents has type Any
...
}
}
The error message on compilation:
Error: overloaded method value apply with alternatives:
(underlying: List[v1.objects.Event])v1.objects.EventList
<and>
(doc: org.mongodb.scala.Document)v1.objects.EventList
cannot be applied to (String, List[Object])
eventList = EventList(eventList.underlying :+ newEvents.underlying)
scala playframework
asked Nov 26 '18 at 11:36
Kristian Rafael AlvarezKristian Rafael Alvarez
274
add a comment |
1
I have an issue with a case class + companion object and (possibly) its interaction with Play. Whenever i try to pass it as an argument for a method, it is interpreted as being of type any instead of EventList. Using it in a method body works perfectly, however.
I can't seem to understand why. Below is a simplified segment of the code in question (it comes from a large code base).
EventList.scala:
package v1.objects
final case class EventList( ... ) {
...
}
object EventList {
def apply( ... ): EventList = {
...
new EventList( ... )
}
}
ObjectRepository.scala:
package v1.objects
class ObjectExecutionContext @Inject()(actorSystem: ActorSystem) extends CustomExecutionContext(actorSystem, "repository.dispatcher")
trait ObjectRepository {
def patch(newEvents: EventList)(implicit mc: MarkerContext): Future[Int]
...
}
@Singleton
class ObjectRepositoryImpl @Inject()()(implicit ec: ObjectExecutionContext) extends ObjectRepository {
override def patch(newEvents: EventList)(implicit mc: MarkerContext): Future[Int] = {
...
var eventList = EventList(...) // Retreive the old events from DB, works fine
eventList = EventList(eventList.underlying :+ newEvents.underlying) // <- This fails! newEvents has type Any
...
}
}
The error message on compilation:
Error: overloaded method value apply with alternatives:
(underlying: List[v1.objects.Event])v1.objects.EventList
<and>
(doc: org.mongodb.scala.Document)v1.objects.EventList
cannot be applied to (String, List[Object])
eventList = EventList(eventList.underlying :+ newEvents.underlying)
scala playframework
asked Nov 26 '18 at 11:36
Kristian Rafael AlvarezKristian Rafael Alvarez
274
You should include the full declarations of the case class arguments and theapplymethod arguments, without that it is quite hard to guess why it does not work.
– Gábor Bakos
Nov 26 '18 at 11:52
4
:+adds one element to a list. You probably intended to use++to combine two lists together. Other than that, more info is needed.
– Oleg Pyzhcov
Nov 26 '18 at 12:01
The case class arguments and the apply method arguments all work as expected, and they work fine in the method bodies. The problem is that the compiler ignores the type in the method declaration and treats it asAny. Thanks Oleg, I simplified a for loop and forgot to make that change :)
– Kristian Rafael Alvarez
Nov 26 '18 at 12:20
If I include the full declarations then I break non-disclosure clauses on my contract. I've heavily modified this example code to cover the gist of the problem without revealing anything about the actual problem, but I can try to construct a minimal breaking example and upload it to github. I was hoping that it perhaps was some fundamental flaw in my usage of case classes with object companions and their interaction with singletons in play (or perhaps in method arguments in general) that would easily be identified by someone with more knowledge on Scala/Play.
– Kristian Rafael Alvarez
Nov 26 '18 at 12:20
add a comment |
1
1
1
I have an issue with a case class + companion object and (possibly) its interaction with Play. Whenever i try to pass it as an argument for a method, it is interpreted as being of type any instead of EventList. Using it in a method body works perfectly, however.
I can't seem to understand why. Below is a simplified segment of the code in question (it comes from a large code base).
EventList.scala:
package v1.objects
final case class EventList( ... ) {
...
}
object EventList {
def apply( ... ): EventList = {
...
new EventList( ... )
}
}
ObjectRepository.scala:
package v1.objects
class ObjectExecutionContext @Inject()(actorSystem: ActorSystem) extends CustomExecutionContext(actorSystem, "repository.dispatcher")
trait ObjectRepository {
def patch(newEvents: EventList)(implicit mc: MarkerContext): Future[Int]
...
}
@Singleton
class ObjectRepositoryImpl @Inject()()(implicit ec: ObjectExecutionContext) extends ObjectRepository {
override def patch(newEvents: EventList)(implicit mc: MarkerContext): Future[Int] = {
...
var eventList = EventList(...) // Retreive the old events from DB, works fine
eventList = EventList(eventList.underlying :+ newEvents.underlying) // <- This fails! newEvents has type Any
...
}
}
The error message on compilation:
Error: overloaded method value apply with alternatives:
(underlying: List[v1.objects.Event])v1.objects.EventList
<and>
(doc: org.mongodb.scala.Document)v1.objects.EventList
cannot be applied to (String, List[Object])
eventList = EventList(eventList.underlying :+ newEvents.underlying)
scala playframework
asked Nov 26 '18 at 11:36
Kristian Rafael AlvarezKristian Rafael Alvarez
274
I have an issue with a case class + companion object and (possibly) its interaction with Play. Whenever i try to pass it as an argument for a method, it is interpreted as being of type any instead of EventList. Using it in a method body works perfectly, however.
I can't seem to understand why. Below is a simplified segment of the code in question (it comes from a large code base).
EventList.scala:
package v1.objects
final case class EventList( ... ) {
...
}
object EventList {
def apply( ... ): EventList = {
...
new EventList( ... )
}
}
ObjectRepository.scala:
package v1.objects
class ObjectExecutionContext @Inject()(actorSystem: ActorSystem) extends CustomExecutionContext(actorSystem, "repository.dispatcher")
trait ObjectRepository {
def patch(newEvents: EventList)(implicit mc: MarkerContext): Future[Int]
...
}
@Singleton
class ObjectRepositoryImpl @Inject()()(implicit ec: ObjectExecutionContext) extends ObjectRepository {
override def patch(newEvents: EventList)(implicit mc: MarkerContext): Future[Int] = {
...
var eventList = EventList(...) // Retreive the old events from DB, works fine
eventList = EventList(eventList.underlying :+ newEvents.underlying) // <- This fails! newEvents has type Any
...
}
}
The error message on compilation:
Error: overloaded method value apply with alternatives:
(underlying: List[v1.objects.Event])v1.objects.EventList
<and>
(doc: org.mongodb.scala.Document)v1.objects.EventList
cannot be applied to (String, List[Object])
eventList = EventList(eventList.underlying :+ newEvents.underlying)
scala playframework
scala playframework
asked Nov 26 '18 at 11:36
Kristian Rafael AlvarezKristian Rafael Alvarez
274
asked Nov 26 '18 at 11:36
Kristian Rafael AlvarezKristian Rafael Alvarez
274
asked Nov 26 '18 at 11:36
Kristian Rafael AlvarezKristian Rafael Alvarez
274
asked Nov 26 '18 at 11:36
Kristian Rafael AlvarezKristian Rafael Alvarez
274
asked Nov 26 '18 at 11:36
Kristian Rafael AlvarezKristian Rafael Alvarez
274
274
You should include the full declarations of the case class arguments and theapplymethod arguments, without that it is quite hard to guess why it does not work.
– Gábor Bakos
Nov 26 '18 at 11:52
4
:+adds one element to a list. You probably intended to use++to combine two lists together. Other than that, more info is needed.
– Oleg Pyzhcov
Nov 26 '18 at 12:01
The case class arguments and the apply method arguments all work as expected, and they work fine in the method bodies. The problem is that the compiler ignores the type in the method declaration and treats it asAny. Thanks Oleg, I simplified a for loop and forgot to make that change :)
– Kristian Rafael Alvarez
Nov 26 '18 at 12:20
If I include the full declarations then I break non-disclosure clauses on my contract. I've heavily modified this example code to cover the gist of the problem without revealing anything about the actual problem, but I can try to construct a minimal breaking example and upload it to github. I was hoping that it perhaps was some fundamental flaw in my usage of case classes with object companions and their interaction with singletons in play (or perhaps in method arguments in general) that would easily be identified by someone with more knowledge on Scala/Play.
– Kristian Rafael Alvarez
Nov 26 '18 at 12:20
add a comment |
You should include the full declarations of the case class arguments and theapplymethod arguments, without that it is quite hard to guess why it does not work.
– Gábor Bakos
Nov 26 '18 at 11:52
4
:+adds one element to a list. You probably intended to use++to combine two lists together. Other than that, more info is needed.
– Oleg Pyzhcov
Nov 26 '18 at 12:01
The case class arguments and the apply method arguments all work as expected, and they work fine in the method bodies. The problem is that the compiler ignores the type in the method declaration and treats it asAny. Thanks Oleg, I simplified a for loop and forgot to make that change :)
– Kristian Rafael Alvarez
Nov 26 '18 at 12:20
If I include the full declarations then I break non-disclosure clauses on my contract. I've heavily modified this example code to cover the gist of the problem without revealing anything about the actual problem, but I can try to construct a minimal breaking example and upload it to github. I was hoping that it perhaps was some fundamental flaw in my usage of case classes with object companions and their interaction with singletons in play (or perhaps in method arguments in general) that would easily be identified by someone with more knowledge on Scala/Play.
– Kristian Rafael Alvarez
Nov 26 '18 at 12:20
You should include the full declarations of the case class arguments and the
apply method arguments, without that it is quite hard to guess why it does not work.– Gábor Bakos
Nov 26 '18 at 11:52
You should include the full declarations of the case class arguments and the
apply method arguments, without that it is quite hard to guess why it does not work.– Gábor Bakos
Nov 26 '18 at 11:52
4
4
:+ adds one element to a list. You probably intended to use ++ to combine two lists together. Other than that, more info is needed.– Oleg Pyzhcov
Nov 26 '18 at 12:01
:+ adds one element to a list. You probably intended to use ++ to combine two lists together. Other than that, more info is needed.– Oleg Pyzhcov
Nov 26 '18 at 12:01
The case class arguments and the apply method arguments all work as expected, and they work fine in the method bodies. The problem is that the compiler ignores the type in the method declaration and treats it as
Any. Thanks Oleg, I simplified a for loop and forgot to make that change :)– Kristian Rafael Alvarez
Nov 26 '18 at 12:20
The case class arguments and the apply method arguments all work as expected, and they work fine in the method bodies. The problem is that the compiler ignores the type in the method declaration and treats it as
Any. Thanks Oleg, I simplified a for loop and forgot to make that change :)– Kristian Rafael Alvarez
Nov 26 '18 at 12:20
If I include the full declarations then I break non-disclosure clauses on my contract. I've heavily modified this example code to cover the gist of the problem without revealing anything about the actual problem, but I can try to construct a minimal breaking example and upload it to github. I was hoping that it perhaps was some fundamental flaw in my usage of case classes with object companions and their interaction with singletons in play (or perhaps in method arguments in general) that would easily be identified by someone with more knowledge on Scala/Play.
– Kristian Rafael Alvarez
Nov 26 '18 at 12:20
If I include the full declarations then I break non-disclosure clauses on my contract. I've heavily modified this example code to cover the gist of the problem without revealing anything about the actual problem, but I can try to construct a minimal breaking example and upload it to github. I was hoping that it perhaps was some fundamental flaw in my usage of case classes with object companions and their interaction with singletons in play (or perhaps in method arguments in general) that would easily be identified by someone with more knowledge on Scala/Play.
– Kristian Rafael Alvarez
Nov 26 '18 at 12:20
add a comment |
1 Answer
1
active
oldest
votes
5
This creates a List of Any:
eventList.underlying :+ newEvents.underlying
This adds a List as an Element to the existing List.
And the common Super-Type is then Any.
What you need is the function that adds a List to another List > this returns a List of their contents:
eventList.underlying ++ newEvents.underlying
The exact syntax depends on the underlying type.
Example:
case class EventList(underlying: Seq[String])
val el1 = EventList(Seq("e1", "e2"))
val el2 = EventList(Seq("e4", "e5"))
println(el1.underlying :+ el2.underlying) // List(e1, e2, List(e4, e5))
println(el1.underlying ++ el2.underlying) // List(e1, e2, e4, e5)
answered Nov 26 '18 at 12:16
pmepme
3,28211830
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
5
This creates a List of Any:
eventList.underlying :+ newEvents.underlying
This adds a List as an Element to the existing List.
And the common Super-Type is then Any.
What you need is the function that adds a List to another List > this returns a List of their contents:
eventList.underlying ++ newEvents.underlying
The exact syntax depends on the underlying type.
Example:
case class EventList(underlying: Seq[String])
val el1 = EventList(Seq("e1", "e2"))
val el2 = EventList(Seq("e4", "e5"))
println(el1.underlying :+ el2.underlying) // List(e1, e2, List(e4, e5))
println(el1.underlying ++ el2.underlying) // List(e1, e2, e4, e5)
answered Nov 26 '18 at 12:16
pmepme
3,28211830
add a comment |
5
This creates a List of Any:
eventList.underlying :+ newEvents.underlying
This adds a List as an Element to the existing List.
And the common Super-Type is then Any.
What you need is the function that adds a List to another List > this returns a List of their contents:
eventList.underlying ++ newEvents.underlying
The exact syntax depends on the underlying type.
Example:
case class EventList(underlying: Seq[String])
val el1 = EventList(Seq("e1", "e2"))
val el2 = EventList(Seq("e4", "e5"))
println(el1.underlying :+ el2.underlying) // List(e1, e2, List(e4, e5))
println(el1.underlying ++ el2.underlying) // List(e1, e2, e4, e5)
answered Nov 26 '18 at 12:16
pmepme
3,28211830
add a comment |
5
5
5
This creates a List of Any:
eventList.underlying :+ newEvents.underlying
This adds a List as an Element to the existing List.
And the common Super-Type is then Any.
What you need is the function that adds a List to another List > this returns a List of their contents:
eventList.underlying ++ newEvents.underlying
The exact syntax depends on the underlying type.
Example:
case class EventList(underlying: Seq[String])
val el1 = EventList(Seq("e1", "e2"))
val el2 = EventList(Seq("e4", "e5"))
println(el1.underlying :+ el2.underlying) // List(e1, e2, List(e4, e5))
println(el1.underlying ++ el2.underlying) // List(e1, e2, e4, e5)
answered Nov 26 '18 at 12:16
pmepme
3,28211830
This creates a List of Any:
eventList.underlying :+ newEvents.underlying
This adds a List as an Element to the existing List.
And the common Super-Type is then Any.
What you need is the function that adds a List to another List > this returns a List of their contents:
eventList.underlying ++ newEvents.underlying
The exact syntax depends on the underlying type.
Example:
case class EventList(underlying: Seq[String])
val el1 = EventList(Seq("e1", "e2"))
val el2 = EventList(Seq("e4", "e5"))
println(el1.underlying :+ el2.underlying) // List(e1, e2, List(e4, e5))
println(el1.underlying ++ el2.underlying) // List(e1, e2, e4, e5)
answered Nov 26 '18 at 12:16
pmepme
3,28211830
edited Nov 26 '18 at 12:23
answered Nov 26 '18 at 12:16
pmepme
3,28211830
answered Nov 26 '18 at 12:16
pmepme
3,28211830
answered Nov 26 '18 at 12:16
pmepme
3,28211830
3,28211830
add a comment |
add a comment |
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You should include the full declarations of the case class arguments and the
applymethod arguments, without that it is quite hard to guess why it does not work.– Gábor Bakos
Nov 26 '18 at 11:52
4
:+adds one element to a list. You probably intended to use++to combine two lists together. Other than that, more info is needed.– Oleg Pyzhcov
Nov 26 '18 at 12:01
The case class arguments and the apply method arguments all work as expected, and they work fine in the method bodies. The problem is that the compiler ignores the type in the method declaration and treats it as
Any. Thanks Oleg, I simplified a for loop and forgot to make that change :)– Kristian Rafael Alvarez
Nov 26 '18 at 12:20
If I include the full declarations then I break non-disclosure clauses on my contract. I've heavily modified this example code to cover the gist of the problem without revealing anything about the actual problem, but I can try to construct a minimal breaking example and upload it to github. I was hoping that it perhaps was some fundamental flaw in my usage of case classes with object companions and their interaction with singletons in play (or perhaps in method arguments in general) that would easily be identified by someone with more knowledge on Scala/Play.
– Kristian Rafael Alvarez
Nov 26 '18 at 12:20