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Add exported IsNullable method to nullable types #442

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Add exported IsNullable method to nullable types #442

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10 changes: 10 additions & 0 deletions nullable_types.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,9 @@ package graphql

import (
"fmt"
"reflect"

"github.com/graph-gophers/graphql-go/internal/exec/packer"
)

// NullString is a string that can be null. Use it in input structs to
Expand All @@ -12,6 +15,13 @@ type NullString struct {
Set bool
}

// IsNullable takes a type and returns whether it represents a Nullable value
// as defined by NullUnmarshaller
func IsNullable(t reflect.Type) bool {
_, ok := reflect.New(t).Interface().(packer.NullUnmarshaller)
return ok
}

func (NullString) ImplementsGraphQLType(name string) bool {
return name == "String"
}
Expand Down