concept-api: Migrate :-separated tags to separate tags

concept-api/src/main/scala/no/ndla/conceptapi/db/migration/V22__SplitTags.scala

@@ -0,0 +1,37 @@
+/*
+ * Part of NDLA concept-api
+ * Copyright (C) 2025 NDLA
+ *
+ * See LICENSE
+ *
+ */
+
+package no.ndla.conceptapi.db.migration
+
+import io.circe.parser
+import io.circe.syntax.EncoderOps
+import io.circe.generic.auto.*
+import no.ndla.database.DocumentMigration
+
+case class TagsObject(tags: List[String], language: String)
+
+class V22__SplitTags extends DocumentMigration {
+  override val columnName: String = "document"
+  override val tableName: String  = "conceptdata"
+
+  private def convertTags(tags: List[TagsObject]): List[TagsObject] = tags.map { to =>
+    val splitTags = to.tags.flatMap(_.split(":")).filterNot(_.isEmpty)
+    to.copy(tags = splitTags)
+  }
+
+  override def convertColumn(document: String): String = {
+    val oldDocument = parser.parse(document).toTry.get
+    oldDocument.hcursor.downField("tags").as[Option[List[TagsObject]]].toTry.get match {
+      case None => document
+      case Some(tags) =>
+        val convertedTags = convertTags(tags).asJson
+        val newDocument   = oldDocument.mapObject(_.remove("tags").add("tags", convertedTags))
+        newDocument.noSpaces
+    }
+  }
+}

concept-api/src/test/scala/no/ndla/conceptapi/db/migration/V22__SplitTagsTest.scala

@@ -0,0 +1,45 @@
+/*
+ * Part of NDLA concept-api
+ * Copyright (C) 2025 NDLA
+ *
+ * See LICENSE
+ *
+ */
+
+package no.ndla.conceptapi.db.migration
+
+import no.ndla.conceptapi.UnitSuite
+
+class V22__SplitTagsTest extends UnitSuite {
+
+  val migration = new V22__SplitTags
+
+  test("That converting colon separated tags works") {
+    val oldDocument =
+      """{"tags":[{"tags":["tag1:tag2:tag3"],"language":"nb"},{"tags":["tag4:tag5:tag6"],"language":"en"}]}"""
+    val converted = migration.convertColumn(oldDocument)
+    val expectedDocument =
+      """{"tags":[{"tags":["tag1","tag2","tag3"],"language":"nb"},{"tags":["tag4","tag5","tag6"],"language":"en"}]}"""
+    converted should be(expectedDocument)
+  }
+
+  test("That converting colon separated tags works with empty values") {
+    val oldDocument      = """{"tags":[{"tags":["tag1::","apekatt",":snabeldyr:"],"language":"nb"}]}"""
+    val converted        = migration.convertColumn(oldDocument)
+    val expectedDocument = """{"tags":[{"tags":["tag1","apekatt","snabeldyr"],"language":"nb"}]}"""
+    converted should be(expectedDocument)
+  }
+
+  test("That non colon separated tags are not changed") {
+    val oldDocument      = """{"tags":[{"tags":["tag1","apekatt","snabeldyr"],"language":"nb"}]}"""
+    val converted        = migration.convertColumn(oldDocument)
+    val expectedDocument = """{"tags":[{"tags":["tag1","apekatt","snabeldyr"],"language":"nb"}]}"""
+    converted should be(expectedDocument)
+  }
+
+  test("That no tags doesn't crash") {
+    val oldDocument = """{"someotherfield":"yabadabado"}"""
+    val converted   = migration.convertColumn(oldDocument)
+    converted should be(oldDocument)
+  }
+}