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_alias in mutation argument breaks compilation #930
Description
I use client generation and we have _alias argument for one mutation in graphql schema I am using. This breaks compilation as generated MutationProjection method contains 2 arguments with the same name:
public fun nodeSetCreate2(
_alias: String? = default<MutationProjection, String?>("_alias"),
summary: String? = default<MutationProjection, String?>("summary"),
_alias: String? = null,
_projection: MdNodeSetNodeMutationResultProjection.() -> MdNodeSetNodeMutationResultProjection,
): MutationProjection {
field(_alias, "nodeSetCreate2", MdNodeSetNodeMutationResultProjection(inputValueSerializer),
_projection, "_alias" to _alias, "summary" to summary)
return this
}It generates this error:
e: file:///<path>/build/generated/sources/dgs-codegen/com/ataccama/metadata/client/dgs/client/MutationProjection.kt:3090:5 Conflicting declarations:
_alias: String? = ...
_alias: String? = ...
Would it be possible to override the parameter name somehow?
My current solution is to replace the name in the kotlin file right after it is generated. This is my current config of GenerateJavaTask:
tasks.withType<com.netflix.graphql.dgs.codegen.gradle.GenerateJavaTask> {
schemaPaths = mutableListOf("$projectDir/src/main/resources/graphql-client/metadata/schema.graphqls")
packageName = "com.ataccama.metadata.client.dgs"
language = "kotlin"
generateClient = true
generateKotlinNullableClasses = true
generateKotlinClosureProjections = true
shortProjectionNames = true
typeMapping = mutableMapOf(
"AnyScalar" to "kotlin.Any",
"BigDecimal" to "java.math.BigDecimal",
"BigInteger" to "java.math.BigInteger",
"Byte" to "kotlin.Byte",
"Cursor" to "kotlin.String",
"Duration" to "kotlin.String",
"Filter" to "kotlin.String",
"GID" to "kotlin.String",
"Hcn" to "kotlin.Long",
"Json" to "kotlin.Any",
"JsonNode" to "kotlin.Any",
"Long" to "kotlin.Long",
"New" to "kotlin.Any",
"NodePath" to "kotlin.String",
"ObjectLink" to "kotlin.String",
"Patch" to "kotlin.Any",
"RichText" to "kotlin.String",
"SessionId" to "kotlin.String",
"Short" to "kotlin.Short",
"Timestamp" to "kotlin.String",
)
doLast {
// Fix DGS codegen conflict: schema field `_alias` on nodeSetCreate2 clashes with codegen's own `_alias` parameter
val mutationFile = file("build/generated/sources/dgs-codegen/com/ataccama/metadata/client/dgs/client/MutationProjection.kt")
if (mutationFile.exists()) {
var content = mutationFile.readText()
content = content.replace(
" _alias: String? = default<MutationProjection, String?>(\"_alias\"),\n" +
" summary: String? = default<MutationProjection, String?>(\"summary\"),\n" +
" _alias: String? = null,",
" nodeSetAlias: String? = default<MutationProjection, String?>(\"_alias\"),\n" +
" summary: String? = default<MutationProjection, String?>(\"summary\"),\n" +
" _alias: String? = null,",
)
content = content.replace(
"\"_alias\" to _alias, \"summary\" to summary)",
"\"_alias\" to nodeSetAlias, \"summary\" to summary)",
)
mutationFile.writeText(content)
}
}
}
Activity
abhinavs1920 commentedon Oct 16, 2026
Hit the same issue. When a field argument is named _alias or _projection, the generated Kotlin2 projection function ends up with two parameters with the same name, so the code does not compile. Renaming the generated params (they are internal, e.g.
_alias_) fixes it. Can open a PR with a test if that works.Avoid parameter name collision when field argument is named _alias or…
Disambiguate projection parameters when input argument is named _alia…