Looking at <defer>, is there any docs on how to know the loading and error states of the field? i.e....

# apollo-kotlin

[agrosner]

Looking at defer, is there any docs on how to know the loading and error states of the field? i.e. if we @defer on a nullable type, how could we distinguish between it null (not defined) and presently null?

[agrosner]

i guess if we want to shimmer a carousel of product cards until it loads, if both emissions are null, then our shimmer state will remain. unless we begin counting emissions

[agrosner]

is there a context variable we can use to distinguish emissions

[bod]

on ApolloResponse there is a isLast property that you may be able to use for this?

[bod]

(note that @defer is only applicable on fragments)

[agrosner]

yeah. thats fine with fragments. isLast - would that work with multiple @defer - i.e. will server send back X number of responses for each @defer or will we get only a single secondary response

[bod]

you may get several ( > 2) responses, and only the last one will have it set to true

[agrosner]

Following up here - if the second request fails for some reason (server error, null ability, etc) how would we know?

[bod]

errors are treated the same as usual with defer: you'll get an exception if it's a network issue, or you may get something in ApolloResponse.errors for other cases