Support for default `@JsonView` for a class

[markwoon]

I'd like to be able to specify a default view for all properties of a given class that doesn't already have a view defined on it. This would remove the need to annotate every single property.

Something along the lines of:

@JsonDefaultView(A.class)
public class Foo {
}

[cowtowncoder]

And presumably this would be similar to @JsonView to allow more than one view, I am guessing.

[markwoon]

That would be nice, but not requirement for my needs... :)

Do you think this is feasible?

[cowtowncoder]

It wouldn't be more difficult, and more importantly, it would then be compatible with regular JsonView handling, as this would just add one more level of defaulting. And you can still use simple short-hand notation for single value.

And yes, I think feature itself is feasible, just needs to go in 2.5 since it adds a new annotation type.

[tadas-subonis]

Is this expected anytime soon? at the moment it is really tedious to go and label each of the properties with their respective JsonView.

[rgoldberg]

Instead of adding a whole new @JsonDefaultView annotation, can you add TYPE to the @Target.value of @JsonView, so that it can be applied to types? Can you add an element named ancestors to @JsonView whose type is a new CombinationStyle enum with values OVERRIDE and UNION? You could also add a descendants element, also of type CombinationStyle. You'd have to spec out if descendants takes precedence over ancestors, or vice versa (I prefer the former). ancestors & descendants should each default to one of the CombinationStyle, whichever is more consistent with current behavior for the respective element.

[cowtowncoder]

@tadas-subonis I don't think anyone is working on this at the moment, so it is not known if or when this would be implemented. I'll tag this for 2.9 to at least make it so it will be evaluated as simple implementation might not be too difficult.

@rgoldberg First part -- making @JsonView usable on Class, makes sense.
But I am not sure I follow the latter part (beyond general idea of allowing inheritance of some sort for views across type hierarchy). An example would be nice to show an example of what you are thinking.

[cowtowncoder]

Implemented for 2.9.0 so that @JsonView can now be used on classes, and doing so will use said views as defaults, possibly overridden by per-property annotation as before.

[markwoon]

I've been waiting so long for this! :)

Is 2.9 coming soon, or still months away?