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# File 'lib/graphql/static_validation/rules/subscription_root_exists_and_single_subscription_selection.rb', line 5
def on_operation_definition(node, parent)
if node.operation_type == "subscription"
if context.types.subscription_root.nil?
add_error(GraphQL::StaticValidation::SubscriptionRootExistsError.new(
'Schema is not configured for subscriptions',
nodes: node
))
else
root_fields = subscription_root_fields(node)
if root_fields.map { |field| field.alias || field.name }.uniq.size != 1
add_error(GraphQL::StaticValidation::NotSingleSubscriptionError.new(
'A subscription operation may only have one selection',
nodes: node,
))
elsif root_fields.any? { |field| field.name.start_with?("__") }
add_error(GraphQL::StaticValidation::NotSingleSubscriptionError.new(
'A subscription operation may not select an introspection field',
nodes: node,
))
end
super
end
else
super
end
end
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