Why populateExchange doesn't work with interface/union?

[nghiepdev]

Hi all,

Graphcache Error: Invalid TypeInfo state: Found no flat schema type when one was expected

My schema example:

interface Product {
  id: ID!
  name: String!
  sku: String!
  price: UnsignedInt!
}

type SimpleProduct implements Product {
  id: ID!
  name: String!
  sku: String!
  price: UnsignedInt!
}

type ComplexProduct implements Product {
  id: ID!
  name: String!
  sku: String!
  price: UnsignedInt!
  tax: UnsignedInt!
  fee: UnsignedInt!
}

Doesn't work with an interface and throw an error same the above:

type Query {
  products: [Product]!
}

Work with separate multiple query:

type Query {
  simpleProducts: [SimpleProduct]!
  complexProducts: [ComplexProduct]!
}

[kitten]

I think you mean the populate exchange? And you haven't posted more examples here so I have to make an assumption.

The populateExchange is still not quite stable and complete, so it doesn't support any edge cases around interfaces and unions. In fact, the error you see is the error you get with those.

But if we figure out how to handle these edge cases correctly, we'll push out a new version ✌️

[JoviDeCroock]

This should be fixed in the latest populate-exchange version which is 0.2.0

[nghiepdev]

Thanks @JoviDeCroock