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Fix bson-kotlinx encodeNullableSerializableValue null handling #1453

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Merged
merged 4 commits into from
Jul 29, 2024
Merged

Fix bson-kotlinx encodeNullableSerializableValue null handling #1453

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53b12aa
Fix bson-kotlinx `encodeNullableSerializableValue` null handling
rozza Jul 17, 2024
62e6d0b
Cleanup deferredElementName use
rozza Jul 24, 2024
081b413
Encapsulate deferred element name handling
rozza Jul 24, 2024
ed561b5
Add comment regarding why value could be null
rozza Jul 25, 2024
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16 changes: 16 additions & 0 deletions bson-kotlin/src/test/kotlin/org/bson/codecs/kotlin/DataClassCodecTest.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@ import org.bson.codecs.configuration.CodecConfigurationException
import org.bson.codecs.configuration.CodecRegistries.fromProviders
import org.bson.codecs.kotlin.samples.Box
import org.bson.codecs.kotlin.samples.DataClassEmbedded
import org.bson.codecs.kotlin.samples.DataClassLastItemDefaultsToNull
import org.bson.codecs.kotlin.samples.DataClassListOfDataClasses
import org.bson.codecs.kotlin.samples.DataClassListOfListOfDataClasses
import org.bson.codecs.kotlin.samples.DataClassListOfSealed
Expand All @@ -51,6 +52,7 @@ import org.bson.codecs.kotlin.samples.DataClassWithEnum
import org.bson.codecs.kotlin.samples.DataClassWithEnumMapKey
import org.bson.codecs.kotlin.samples.DataClassWithFailingInit
import org.bson.codecs.kotlin.samples.DataClassWithInvalidBsonRepresentation
import org.bson.codecs.kotlin.samples.DataClassWithListThatLastItemDefaultsToNull
import org.bson.codecs.kotlin.samples.DataClassWithMutableList
import org.bson.codecs.kotlin.samples.DataClassWithMutableMap
import org.bson.codecs.kotlin.samples.DataClassWithMutableSet
Expand Down Expand Up @@ -133,6 +135,20 @@ class DataClassCodecTest {
assertDecodesTo(withStoredNulls, dataClass)
}

@Test
fun testDataClassWithListThatLastItemDefaultsToNull() {
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This is just a copy from bson-kotlinx - to ensure the bson-kotlin library also works as expected.

val expected =
"""{
| "elements": [{"required": "required"}, {"required": "required"}],
|}"""
.trimMargin()

val dataClass =
DataClassWithListThatLastItemDefaultsToNull(
listOf(DataClassLastItemDefaultsToNull("required"), DataClassLastItemDefaultsToNull("required")))
assertRoundTrips(expected, dataClass)
}

@Test
fun testDataClassWithNullableGenericsNotNull() {
val expected =
Expand Down
4 changes: 4 additions & 0 deletions bson-kotlin/src/test/kotlin/org/bson/codecs/kotlin/samples/DataClasses.kt
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Expand Up @@ -57,6 +57,10 @@ data class DataClassWithDefaults(

data class DataClassWithNulls(val boolean: Boolean?, val string: String?, val listSimple: List<String?>?)

data class DataClassWithListThatLastItemDefaultsToNull(val elements: List<DataClassLastItemDefaultsToNull>)

data class DataClassLastItemDefaultsToNull(val required: String, val optional: String? = null)

data class DataClassSelfReferential(
val name: String,
val left: DataClassSelfReferential? = null,
Expand Down
2 changes: 2 additions & 0 deletions bson-kotlinx/src/main/kotlin/org/bson/codecs/kotlinx/BsonEncoder.kt
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Expand Up @@ -156,6 +156,8 @@ internal class DefaultBsonEncoder(
if (value != null || configuration.explicitNulls) {
encodeName(it)
super.encodeNullableSerializableValue(serializer, value)
} else {
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It seems worth it to add tests for the corresponding else clause in the encodeSerializableValue method just above (I removed the clause and no tests fails, so it's not covered).

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I can't concoct a test that triggers this. That said it doesn't guarantee that there isn't a scenario where it could be triggered.

As we are skipping this value it makes sense to reset the defferred name if it exists.
However, I think I can clean up the usage.

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@jyemin I cleaned up the usage and encapsulated the handling of deferred element names.

deferredElementName = null
}
}
?: super.encodeNullableSerializableValue(serializer, value)
Expand Down
23 changes: 23 additions & 0 deletions bson-kotlinx/src/test/kotlin/org/bson/codecs/kotlinx/KotlinSerializerCodecTest.kt
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Expand Up @@ -45,6 +45,7 @@ import org.bson.codecs.kotlinx.samples.DataClassContainsOpen
import org.bson.codecs.kotlinx.samples.DataClassContainsValueClass
import org.bson.codecs.kotlinx.samples.DataClassEmbedded
import org.bson.codecs.kotlinx.samples.DataClassKey
import org.bson.codecs.kotlinx.samples.DataClassLastItemDefaultsToNull
import org.bson.codecs.kotlinx.samples.DataClassListOfDataClasses
import org.bson.codecs.kotlinx.samples.DataClassListOfListOfDataClasses
import org.bson.codecs.kotlinx.samples.DataClassListOfSealed
Expand Down Expand Up @@ -78,6 +79,7 @@ import org.bson.codecs.kotlinx.samples.DataClassWithEncodeDefault
import org.bson.codecs.kotlinx.samples.DataClassWithEnum
import org.bson.codecs.kotlinx.samples.DataClassWithEnumMapKey
import org.bson.codecs.kotlinx.samples.DataClassWithFailingInit
import org.bson.codecs.kotlinx.samples.DataClassWithListThatLastItemDefaultsToNull
import org.bson.codecs.kotlinx.samples.DataClassWithMutableList
import org.bson.codecs.kotlinx.samples.DataClassWithMutableMap
import org.bson.codecs.kotlinx.samples.DataClassWithMutableSet
Expand Down Expand Up @@ -255,6 +257,27 @@ class KotlinSerializerCodecTest {
assertRoundTrips(expectedNulls, dataClass, altConfiguration)
}

@Test
fun testDataClassWithListThatLastItemDefaultsToNull() {
val expectedWithOutNulls =
"""{
| "elements": [{"required": "required"}, {"required": "required"}],
|}"""
.trimMargin()

val dataClass =
DataClassWithListThatLastItemDefaultsToNull(
listOf(DataClassLastItemDefaultsToNull("required"), DataClassLastItemDefaultsToNull("required")))
assertRoundTrips(expectedWithOutNulls, dataClass)

val expectedWithNulls =
"""{
| "elements": [{"required": "required", "optional": null}, {"required": "required", "optional": null}],
|}"""
.trimMargin()
assertRoundTrips(expectedWithNulls, dataClass, BsonConfiguration(explicitNulls = true))
}

@Test
fun testDataClassWithNullableGenericsNotNull() {
val expected =
Expand Down
5 changes: 5 additions & 0 deletions bson-kotlinx/src/test/kotlin/org/bson/codecs/kotlinx/samples/DataClasses.kt
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Expand Up @@ -82,6 +82,11 @@ data class DataClassWithDefaults(

@Serializable data class DataClassWithNulls(val boolean: Boolean?, val string: String?, val listSimple: List<String?>?)

@Serializable
data class DataClassWithListThatLastItemDefaultsToNull(val elements: List<DataClassLastItemDefaultsToNull>)

@Serializable data class DataClassLastItemDefaultsToNull(val required: String, val optional: String? = null)

@Serializable
data class DataClassSelfReferential(
val name: String,
Expand Down