Missing type in fragment matcher json

README.md

What I have done

I download schema.json from server with apollo-tooling cli and give it to apollo cache with fragment matcher. That time server did not have CommentNotification type, just LikeNotification type which implements Notification interface.

I have notification components in react-native for LikeNotification type and Notification interface. I put a switch case which fallbacks unknown notifications which implements Notification interface to default notifications component.

My issue with Apollo client

My react-native app which is in app store right now has old version of schema.json and It dont know CommentNotification implements Notification interface and apollo client returns a empty object just with typename.

My question

How can I solve this kind a situation and fallback to interfaces for not implemented types?

apollo-data.json

// This is what apollo returned as query result

{
  "notifications": [{
    "id": "1",
    "text": "User liked your post",
    "sendAt": "2019-01-01",
    "post": {
      "id": "2",
      "name": "Apollo Client",
      "__typename":"Post"
    },
    "__typename": "LikeNotification"
  },{
    "__typename": "CommentNotification"
  }]
}

query.graphql

# This is the query which I send to server via apollo client

query GetNotifications {
  notifications {
    ... on Notification {
      id
      text
      sendAt
    }
    
    ... on LikeNotification {
      user {
        id
        name
      }
      article {
        id
        name
      }
    }
  }
}

response.json

// Server returns this object as query result.

{
  "notifications": [{
    "id": "1",
    "text": "User liked your post",
    "sendAt": "2019-01-01",
    "post": {
      "id": "2",
      "name": "Apollo Client",
      "__typename":"Post"
    },
    "__typename": "LikeNotification"
  },{
    "id": "1",
    "text": "User liked your post",
    "sendAt": "2019-01-01",
    "post": {
      "id": "2",
      "name": "Apollo Client",
      "__typename":"Post"
    },
    "comment": "This is a comment for post",
    "__typename": "CommentNotification"
  }]
}

server-schema.graphql

# This is server graphql schema (simplified)

interface Notification {
  id: ID!
  text: String!
  sendAt: DATESCALAR!
}

type LikeNotification implements Notification {
  id: ID!
  text: String!
  sendAt: DATESCALAR!
  post: Post!
}

# This type is new and It is not in the schema.json generated from old schema which deployed with mobile app.
type CommentNotification implements Notification {
  id: ID!
  text: String!
  sendAt: DATESCALAR!
  post: Post!
  comment: String!
}