New scenario: null keys #75
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| type BookContainer { | ||
| book: Book | ||
| } | ||
| type Book @key(fields: "upc") { |
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Can you implement a resolver for it? I know it's useless, but if a gateway calls it for some reason, a missing resolver will cause an error and affect the result.
| book = books.find((book) => book.upc === reference.upc); | ||
| } | ||
| if (book != null) { | ||
| // Return this null on purpose |
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on what purpose? What's the purpose?
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Can we explain here why it returns null for a Book with upc === 'b3'?
The query starts from Query.bookContainers. The id needs to be resolved from upc, in order to resolve Book.author. Because Book with upc === 'b3' is not resolved, the author is null.
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The scenario is;
a has Book entities with upcs b1, b2 and b3
But b has Book entities with only b1 and b2.
And Hive GW was sending { __typename: "Book", id: null } to c subgraph while it should not send it already as id is non-null.
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