FasterXML / FasterXML/jackson-annotations
[FEATURE] Using Jackson Annotations simultaneously: @JsonNaming @JsonAlias
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描述
Java: 11.0.10
Jackson: 2.12.2
We currently have all fields returned by an API in kebab case (eg: `first-name`), which wants to convert to camel case for consistency with other systems (eg: `firstName`).
This is obviously a breaking change, so the right way to do it would be the API including both versions of the field (kebab + camel), giving sufficient time for folks to migrate from the deprecated key name, and then removing the deprecated fields.
As an improvement, to further decouple the API and consumer applications, it would be great to have this support added to `JsonNaming` or `JsonAlias`
Currently, we have `@JsonNaming(PropertyNamingStrategies.KebabCaseStrategy.class)` at the top of our class to have all fields being deserialized from kebab case. Maybe `JsonNaming` can take another param `aliasStrategies = {AliasStrategy1.class, AliasStrategy2.class}` to indicate alternate naming pattern as aliases only, i.e. both naming conventions should be permitted for deserialization (default, or aliased), while serialization would continue to use the primary convention.
An alternative would be to allow `@JsonAlias` to be applied at the class level, with a `PropertyNamingStrategy` as its value instead.
Or if its not a good idea fitting this into existing annotations, create a `JsonNamingAlias` which can be used like the following:
```java
@JsonNaming(MainPropertyNamingStrategyUsedForSerializationAndDeserialization.class)
@JsonNamingAlias(PropertyNamingStrategies.KebabCaseStrategy.class)
@JsonNamingAlias(AnotherStrategy.class)
class MyPojo {
public String firstName;
}
```
If there are fields in the json to be deserialized which point to the same key with different naming formats (eg: `{"first-name": "codi1", "firstName": "codi2"}`, then just follow what happens when `JsonAlias` are applied to a field with multiple aliases (I believe the precedence is actual property name (or `JsonProperty` if present) followed by first matched alias)
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