Custom object mapper doesn't work

[QuantumBear]

`@Configuration
public class DgsConfiguration {

@Bean
@Qualifier("dgsObjectMapper")
public ObjectMapper dgsObjectMapper() {
    ObjectMapper customMapper = new ObjectMapper();
    customMapper.setPropertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE);
    return customMapper;
}

}`

We want to convert camel case json fields to snake case in response, but it seems not working both in graphiql interface or graphql rest api. Could anyone help me with this, thanks!

[congotej]

Hi @QuantumBear ! Looks like you are setting up the custom object mapper correctly. Can you try adding a unit test to validate if PropertyNamingStrategies.SNAKE_CASE is working as expected? This way you can confirm where the issue is.

[cesar05]

Hello @QuantumBear I have the same problem.
Could you solve it?

[srinivasankavitha]

Hi - For custom serialization, the custom object mapper needs to update Spring's object mapper as described here: https://netflix.github.io/dgs/advanced/custom-object-mapper/

More specifically for your issue of using snake case, it won't work unless you register explicit data fetchers to handle snake case to camel case conversions. More context and examples described here: https://netflix.github.io/dgs/advanced/custom-object-mapper/

[cesar05]

In the next thread is the solve it.
#1742