Relationship with properties doesn't build with interface types.

[purplemana]

Relationships with properties don't build if they are linked to an interface and its implemented types.

Given a schema like this...

# Binary document content details
type DocumentContent {
  # Reference ID of the content
  contentRefId: ID!
  # Document file name
  fileName: String!
  # Document mimeType
  mimeType: String!
  # Document encoding
  encoding: String!
  # Content Checksum
  checksum: String!
  # Uploaded By
  uploadedBy: Uploads!
}

# Uploaded Documents
type Uploads @relation(name: "UPLOADED"){
  from: User!
  to: DocumentContent
  on: String!
}

interface User {
  id: ID!
  email: String!
  fullName: String!
  enabled: Boolean!
  emailVerified: Boolean!
  photoUrl: String
  uploadedDocuments: [Uploads]
}

type CustomUser implements User {
  id: ID!
  email: String!
  password: String!
  fullName: String!
  enabled: Boolean!
  emailVerified: Boolean!
  photoUrl: String
  uploadedDocuments: [Uploads]
}

type LdapUser implements User {
  id: ID!
  userName: String!
  email: String!
  fullName: String!
  enabled: Boolean!
  emailVerified: Boolean!
  photoUrl: String
  uploadedDocuments: [Uploads]
}

augmentSchema and makeAugmentedSchema throw the below error:

/mnt/c/Code/neo4j-graphql-exp/node_modules/neo4j-graphql-js/dist/augment.js:415
    throw new Error('The \'' + field.name.value + '\' field on the \'' + typeName + '\' type uses the \'' + relatedAstNode.name.value + '\'\n    but \'' + relatedAstNode.name.value + '\' comes from \'' + fromName + '\' and goes to \'' + toName + '\'');
                               ^

ReferenceError: field is not defined
    at validateRelationTypeDirectedFields (/mnt/c/Code/neo4j-graphql-exp/node_modules/neo4j-graphql-js/dist/augment.js:415:32)
    at handleRelationTypeDirective (/mnt/c/Code/neo4j-graphql-exp/node_modules/neo4j-graphql-js/dist/augment.js:472:9)
    at handleRelationFields (/mnt/c/Code/neo4j-graphql-exp/node_modules/neo4j-graphql-js/dist/augment.js:391:21)
    at /mnt/c/Code/neo4j-graphql-exp/node_modules/neo4j-graphql-js/dist/augment.js:86:15
    at Array.forEach (<anonymous>)
    at augmentTypeMap (/mnt/c/Code/neo4j-graphql-exp/node_modules/neo4j-graphql-js/dist/augment.js:49:32)
    at makeAugmentedExecutableSchema (/mnt/c/Code/neo4j-graphql-exp/node_modules/neo4j-graphql-js/dist/augmentSchema.js:54:54)
    at makeAugmentedSchema (/mnt/c/Code/neo4j-graphql-exp/node_modules/neo4j-graphql-js/dist/index.js:554:59)
    at Object.<anonymous> (/mnt/c/Code/neo4j-graphql-exp/src/index.js:18:16)
    at Module._compile (internal/modules/cjs/loader.js:689:30)

If the type of Uploads relationship is changed to any of the concrete types, then the schema builds, e.g.

# Binary document content details
type DocumentContent {
  # Reference ID of the content
  contentRefId: ID!
  # Document file name
  fileName: String!
  # Document mimeType
  mimeType: String!
  # Document encoding
  encoding: String!
  # Content Checksum
  checksum: String!
  # Uploaded By
  uploadedBy: Uploads!
}

# Uploaded Documents
type Uploads @relation(name: "UPLOADED"){
  from: CustomUser!
  to: DocumentContent
  on: String!
}

interface User {
  id: ID!
  email: String!
  fullName: String!
  enabled: Boolean!
  emailVerified: Boolean!
  photoUrl: String
}

type CustomUser implements User {
  id: ID!
  email: String!
  password: String!
  fullName: String!
  enabled: Boolean!
  emailVerified: Boolean!
  photoUrl: String
  uploadedDocuments: [Uploads]
}

type LdapUser implements User {
  id: ID!
  userName: String!
  email: String!
  fullName: String!
  enabled: Boolean!
  emailVerified: Boolean!
  photoUrl: String
}

But this would mean that with every concrete type which implements User, we will need to define a new Relationship Type.

[aonamrata2]

Is there a timeline or something on when this feature will be available?
[ ] Handle interface types
[ ] Handle inline fragments
Just wondering if I should wait or do some custom cypher for Production usercase.

[burdiyan]

Having the same issue. Don't know if Neo4j GraphQL Plugin supports this kind of schema. Will try to figure it out.

[burdiyan]

For some reason in my version of Neo4j Desktop the GraphQL plugin doesn't have "Install" button, but the rest of the plugin do have this button.

Anyway, clearly it doesn't work when relation types are pointing to some interfaces in their from or to fields. But the code doesn't give a clear error, because the code uses undefined variable, that's why it fails with confusing ReferenceError.

On this line https://github.com/neo4j-graphql/neo4j-graphql-js/blob/master/src/augment.js#L1071 variable field is not defined.

[anakornk]

Any updates on when will this be implemented ?