Fix #425: Similar classes get incorrectly deduplicated

src/main/kotlin/wu/seal/jsontokotlin/utils/Extensions.kt

@@ -290,16 +290,16 @@ private fun List<KotlinClass>.distinctByPropertiesAndSimilarClassNameOneTime():
         }
         return replaceReferencedClasses(rule)
     }
-    //If class name the same with XXXX append or only diff with number, then treat them as the same class to do distinct
-    val distinctClassesWhenClassNameSimilar = distinctBy {
-        it.codeWithoutXAndNumberClassName()
-    }
+    //If class name the same with XXXX append or only diff with number, then group them in the same entry
     //obtain the class to replace other ref class, if the replace times is less then 2, then it means that no need to replace
     val targetClass = groupBy { it.codeWithoutXAndNumberClassName() }.maxByOrNull { it.value.size }
         ?.takeIf { it.value.size > 1 }?.value?.first() ?: return this
 
-    return distinctClassesWhenClassNameSimilar.map {
-        if (targetClass == it) return@map it
+    return mapNotNull {
+        if (targetClass == it) return@mapNotNull it
+        if (it.codeWithoutXAndNumberClassName() == targetClass.codeWithoutXAndNumberClassName()) {
+            return@mapNotNull null // removing the classes that we are replacing
+        }
         it.replaceClassRefRecursive {
             if (it.codeWithoutXAndNumberClassName() == targetClass.codeWithoutXAndNumberClassName()) {
                 targetClass

src/test/kotlin/wu/seal/jsontokotlin/regression/Issue425Test.kt

@@ -0,0 +1,66 @@
+package wu.seal.jsontokotlin.regression
+
+import com.winterbe.expekt.should
+import org.junit.Test
+import wu.seal.jsontokotlin.generateKotlinClassCode
+import wu.seal.jsontokotlin.model.DefaultValueStrategy
+import wu.seal.jsontokotlin.model.TargetJsonConverter
+import wu.seal.jsontokotlin.test.TestConfig
+import wu.seal.jsontokotlin.utils.BaseTest
+
+class Issue425Test : BaseTest() {
+    @Test
+    fun testIssue425() {
+        val json = """
+            {
+              "firstTeam": {
+                "hometown": {
+                  "name": "Town 1"
+                },
+                "stats": {
+                  "rating": 10
+                }
+              },
+              "secondTeam": {
+                "hometown": {
+                  "name": "Town 2"
+                },
+                "stats": {
+                  "rating": 20
+                }
+              }
+            }
+        """.trimIndent()
+        val expected = """
+            data class Match(
+                val firstTeam: FirstTeam,
+                val secondTeam: SecondTeam
+            )
+
+            data class FirstTeam(
+                val hometown: Hometown,
+                val stats: Stats
+            )
+
+            data class SecondTeam(
+                val hometown: Hometown,
+                val stats: Stats
+            )
+
+            data class Hometown(
+                val name: String
+            )
+
+            data class Stats(
+                val rating: Int
+            )
+        """.trimIndent()
+        TestConfig.apply {
+            isCommentOff = true
+            targetJsonConvertLib = TargetJsonConverter.None
+            defaultValueStrategy = DefaultValueStrategy.None
+            isNestedClassModel = false
+        }
+        json.generateKotlinClassCode("Match").should.equal(expected)
+    }
+}