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GraphQLSyntaxError When An Object Type Is Implementing Multiple Interfaces #235

Open
@alxjhnsn

Description

Hi team!

I have a program that is comparing schemas, and it's currently failing when loading and parsing a schema that has a type implementing multiple interfaces:

Traceback (most recent call last):
 File "/Workspace/devops/graphql_diff/venv/lib/python3.11/site-packages/graphql/utilities/build_ast_schema.py", line 96, in build_schema
 parse(
 File "/Workspace/devops/graphql_diff/venv/lib/python3.11/site-packages/graphql/language/parser.py", line 113, in parse
 return parser.parse_document()
 ^^^^^^^^^^^^^^^^^^^^^^^
 File "/Workspace/devops/graphql_diff/venv/lib/python3.11/site-packages/graphql/language/parser.py", line 241, in parse_document
 definitions=self.many(TokenKind.SOF, self.parse_definition, TokenKind.EOF),
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/Workspace/devops/graphql_diff/venv/lib/python3.11/site-packages/graphql/language/parser.py", line 1156, in many
 append(parse_fn())
 ^^^^^^^^^^
 File "/Workspace/devops/graphql_diff/venv/lib/python3.11/site-packages/graphql/language/parser.py", line 302, in parse_definition
 raise self.unexpected(keyword_token)
graphql.error.syntax_error.GraphQLSyntaxError: Syntax Error: Unexpected Name 'DealBookEndPageFields'.
GraphQL request:1988:61
1987 |
1988 | type EndPageNode implements PageBaseFields, EndPageFields {
 | ^
1989 | id: Int!

Here are the types causing the failure:

interface PageBaseFields {
 id: Int!
 name: String!
 order: Int!
 layout: PageLayoutEnum!
 background: String
 showPageNumber: Boolean
 showBookmarks: Boolean
 includeInBookmarks: Boolean
 hideable: Boolean
 deletable: Boolean
 locked: Boolean
}
interface PageFields {
 image: String
 content: String!
 cards: [String]
}
type EndPageNode implements PageBaseFields, EndPageFields {
 id: Int!
 name: String!
 order: Int!
 layout: PageLayoutEnum!
 background: String
 showPageNumber: Boolean
 showBookmarks: Boolean
 includeInBookmarks: Boolean
 hideable: Boolean
 deletable: Boolean
 locked: Boolean
 image: String
 content: String!
 cards: [String]
}

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