Play Version

2.9.0-M7 (also tested on 2.8.20 and it exists there too)

API

Scala 2.13.11

Operating System

macOS 13.5.1

JDK

openjdk 17.0.8.1 2023-08-24

There is a bug in the Play mapping. Consider this as a sample mapping:

tuple(
"a1"->single("a2"->nonEmptyText),
"a3"->list(text),
"a4"->number
)

We should be able to read the keys from this mapping. But instead ofa3we get an empty string.

This is a sample method for traversing the mappings and getting their keys:

defmappingFieldAddresses(mapping:Mapping[_]):Seq[String]={

varvector:Vector[String]=Vector.empty

defprocessMapping(mapping:Mapping[_],depth:Int=0):Unit={
if(mapping.mappings.size==1) {
vector=vector.appended(mapping.key)
}
if(depth==0||mapping.mappings.size==1) {
mapping.mappings.tail.foreach(processMapping(_, depth+1))
}
}

processMapping(mapping)

vector
}

To reproduce the bug, follow these steps:

• CallmappingFieldAddresseswith the sample mapping as an argument
• Observe the returned sequence of strings

The expected behavior is:

• The returned sequence should contain the keys of the mapping, such asVector( "a1.a2", "a3", "a4" )

The actual behavior is:

• The sequence contains an empty string instead ofa3,such asVector( "a1.a2", "", "a4" )

I have a solution that fixes this bug and passes all the tests. But I'm not sure if it is making any unpredicted new issues. I will create a pull request soon and reference this issue. Please let me know if you have any feedback or suggestions on my solution. I appreciate your help and cooperation.