fix: save code references before key metas to workaround hibernate bug

backend/app/src/test/kotlin/io/tolgee/api/v2/controllers/v2ImportController/SingleStepImportControllerTest.kt

@@ -35,9 +35,13 @@ class SingleStepImportControllerTest : ProjectAuthControllerTest("/v2/projects/"
   @Value("classpath:import/xliff/simple.xliff")
   lateinit var simpleXliff: Resource
 
+  @Value("classpath:import/po/codeReferences.po")
+  lateinit var codeReferencesPo: Resource
+
   lateinit var testData: SingleStepImportTestData
 
   private val xliffFileName: String = "file.xliff"
+  private val poFileName = "file.po"
   private val jsonFileName = "en.json"
 
   @BeforeEach
@@ -60,6 +64,20 @@ class SingleStepImportControllerTest : ProjectAuthControllerTest("/v2/projects/"
     }
   }
 
+  @Test
+  @ProjectJWTAuthTestMethod
+  fun `import po with code references`() {
+    saveAndPrepare()
+    performImport(
+      projectId = testData.project.id,
+      listOf(Pair(poFileName, codeReferencesPo)),
+    )
+    executeInNewTransaction {
+      assertPoImported()
+      getTestTranslation().key.keyMeta!!.codeReferences.map { it.path }.assert.contains("dir/file.py")
+    }
+  }
+
   @Test
   @ProjectJWTAuthTestMethod
   fun `does not create new key if option isn't enabled`() {
@@ -394,6 +412,10 @@ class SingleStepImportControllerTest : ProjectAuthControllerTest("/v2/projects/"
     getTestTranslation().text.assert.isEqualTo("test")
   }
 
+  private fun assertPoImported() {
+    getTestTranslation().text.assert.isEqualTo("In English!")
+  }
+
   private fun saveAndPrepare() {
     testDataService.saveTestData(testData.root)
     userAccount = testData.user

backend/app/src/test/resources/import/po/codeReferences.po

@@ -0,0 +1,12 @@
+msgid ""
+msgstr ""
+"Language: en\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals = 2; plural = (n > 1)\n"
+"X-Generator: Tolgee\n"
+
+#: dir/file.py:42
+msgid "test"
+msgstr "In English!"

backend/data/src/main/kotlin/io/tolgee/service/dataImport/StoredDataImporter.kt

@@ -162,13 +162,13 @@ class StoredDataImporter(
   }
 
   private fun saveKeyMetaData(keyEntitiesToSave: Collection<Key>) {
-    keyMetaService.saveAll(keyMetasToSave)
     keyEntitiesToSave.flatMap {
       it.keyMeta?.comments ?: emptyList()
     }.also { keyMetaService.saveAllComments(it) }
     keyEntitiesToSave.flatMap {
       it.keyMeta?.codeReferences ?: emptyList()
     }.also { keyMetaService.saveAllCodeReferences(it) }
+    keyMetaService.saveAll(keyMetasToSave)
   }
 
   private fun saveTranslations() {