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Fix: Leaf Field Selections for enums must also be empty #452

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merged 3 commits into from
Jun 11, 2018
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Fix: Leaf Field Selections for enums must also be empty #452

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6886e39
Fix: Leaf Field Selections for enums must also be empty
matprec May 29, 2018
2973be6
Expand leaf field selection explanatory text for enums
matprec May 30, 2018
5fcab80
Smoother phrasing
matprec May 30, 2018
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8 changes: 4 additions & 4 deletions spec/Section 5 -- Validation.md
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Original file line number Diff line number Diff line change
Expand Up @@ -561,14 +561,14 @@ fragment conflictingDifferingResponses on Pet {

* For each {selection} in the document
* Let {selectionType} be the result type of {selection}
* If {selectionType} is a scalar:
* If {selectionType} is a scalar or enum:
* The subselection set of that selection must be empty
* If {selectionType} is an interface, union, or object
* The subselection set of that selection must NOT BE empty

**Explanatory Text**

Field selections on scalars are never allowed: scalars
Field selections on scalars or enums are never allowed, because they
are the leaf nodes of any GraphQL query.

The following is valid.
Expand All @@ -582,15 +582,15 @@ fragment scalarSelection on Dog {
The following is invalid.

```graphql counter-example
fragment scalarSelectionsNotAllowedOnBoolean on Dog {
fragment scalarSelectionsNotAllowedOnInt on Dog {
barkVolume {
sinceWhen
}
}
```

Conversely the leaf field selections of GraphQL queries
must be scalars. Leaf selections on objects, interfaces,
must be of type scalar or enum. Leaf selections on objects, interfaces,
and unions without subfields are disallowed.

Let's assume the following additions to the query root type of the schema:
Expand Down