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nullable openapi properties converted to non-nullable gql fields #359

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nlundquist opened this issue Feb 17, 2021 · 5 comments · May be fixed by #360
Open

nullable openapi properties converted to non-nullable gql fields #359

nlundquist opened this issue Feb 17, 2021 · 5 comments · May be fixed by #360

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@nlundquist
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nlundquist commented Feb 17, 2021 •
edited

OpenAPI properties may be nullable & required. required only indicates that a key must be present in an object to be valid, it makes no restriction on the type of the value corresponding to that key. openapi-to-graphql assumes that required OpenAPI properties are non-nullable:

openapi-to-graphql/packages/openapi-to-graphql/src/schema_builder.ts

Lines 622 to 623 in a06d6f4

const requiredProperty =
typeof def.required === 'object' && def.required.includes(fieldTypeKey)

To Reproduce
Use openapi-to-graphql on a spec with type with a required field that is also nullable. Queries for that type which return a null for that nullable field cause unexpected validation errors.

Expected behavior
No validation errors when returning nulls for explicitly nullable fields.
@Alan-Cha
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Very interesting! I will review the spec but thank you so much for reporting this issue! This is an important distinction.

@nlundquist nlundquist linked a pull request Feb 18, 2021 that will close this issue
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@nlundquist
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nlundquist commented Feb 18, 2021 •
edited

Thinking about this a bit more I don't think that required has any relevance to a GraphQL API. Certainly not during querying as it's entirely up to the querier to specify what subset of fields they wish to fetch.

To be useful during mutation, GQL would need to be able to validate the presence of a field independently of it's type. GQL can't do that though- every non-nullable field of an input type is implicitly also required. If openapi-to-graphql tried to use required to imply non-nullability on input types, it would break with any API that has a required nullable field on an input type.

For openapi-to-graphql to validate required precisely it would need to run a JSONSchema validator against the input types since the GQL validator doesn't have the flexibility required. Probably easier in the short term to just document this incompatibility between the specifications.

@Alan-Cha
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After some more careful review, I believe you are correct! This bug originally stems from a misunderstanding of what required means. We should be checking for nullable instead, so thank you for the clarification.

@Beny406 Beny406 mentioned this issue Aug 12, 2021
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@nicolasparada
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Any progress on this?
This prevent us from using nullable fields.

@nicolasparada
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nicolasparada commented Feb 22, 2023 •
edited

Setting default: null does the trick.
Does not fix this issue, but its a workaround.

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use nullable OpenAPI property to determine nullability nlundquist/openapi-to-graphql
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@nlundquist @nicolasparada @Alan-Cha