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package validator
import (
"fmt"
"github.com/vektah/gqlparser/ast"
. "github.com/vektah/gqlparser/validator"
)
func init() {
AddRule("FragmentsOnCompositeTypes", func(observers *Events, addError AddErrFunc) {
observers.OnInlineFragment(func(walker *Walker, inlineFragment *ast.InlineFragment) {
fragmentType := walker.Schema.Types[inlineFragment.TypeCondition]
if fragmentType == nil || fragmentType.IsCompositeType() {
return
}
message := fmt.Sprintf(`Fragment cannot condition on non composite type "%s".`, inlineFragment.TypeCondition)
addError(
Message(message),
At(inlineFragment.Position),
)
})
observers.OnFragment(func(walker *Walker, fragment *ast.FragmentDefinition) {
if fragment.Definition == nil || fragment.TypeCondition == "" || fragment.Definition.IsCompositeType() {
return
}
message := fmt.Sprintf(`Fragment "%s" cannot condition on non composite type "%s".`, fragment.Name, fragment.TypeCondition)
addError(
Message(message),
At(fragment.Position),
)
})
})
}
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