How to ignore fields like dates and IDs?

[alvinwo]

Hey team, this is a great project to do the snapshot testing in Java world. I noticed in the doc that you support to ignore fields like dates but I didn't find examples about this.

So if I would like to ignore some fields in snapshot testing, should I create a new SnapshotSerializer, or it there any other way to achieve that?

[jackmatt2]

Yes, you can use regular Jackson configuration to ignore dates etc.

You will need to create a serializer similar to this Hibernate one.
https://github.com/origin-energy/java-snapshot-testing#example-hibernateserializer

Then customise as needed

objectMapper.addMixIn(DateTime.class, IgnoreTypeMixin.class);
objectMapper.addMixIn(Instant.class, IgnoreTypeMixin.class);
objectMapper.addMixIn(Date.class, IgnoreTypeMixin.class);

Update your snapshot.properties to include the new serializer (alternatively replace the default one)

serializer.custom=com.example.MyCustomSerializer

expect.serializer('custom').toMatchSnapshot(foo)

[alvinwo]

Got it, thx