Comments (1)
Hey,
I am personally a bit on the ropes whether that would work out for several reasons, the resolveType
is dependent on the users implementation, this means that that function could be relying on context or properties on the object that are later stripped out as they aren't queried by the request-document.
A more reliable way of finding out what types is returned between the client and server is by adding the __typename
selection which in your example will amount to { title: "Is it user or post", __typename: "Post" }
. A lot of GraphQL clients also add this selection and then remove it from the response object before returning it to the user.
Another alternative if you really don't want to touch the GraphQL client document would be to do something like heuristic fragment matching, on a union type as you suggest the request document will look like
... on User { name }
... on Post { title }
You can go over the selections of these fragments and see which ones match, this is a heuristic approximation but should generally work well if you have access to the server-side schema to know the difference between the interface and object definitions.
from graphql-js.
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from graphql-js.