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# frozen_string_literal: true
module GraphQL
class Schema
class Validator
# Use this to specifically reject or permit `nil` values (given as `null` from GraphQL).
#
# @example require a non-null value for an argument if it is provided
# argument :name, String, required: false, validates: { allow_null: false }
class AllowNullValidator < Validator
MESSAGE = "%{validated} can't be null"
def initialize(allow_null_positional, allow_null: nil, message: MESSAGE, **default_options)
@message = message
super(**default_options)
@allow_null = allow_null.nil? ? allow_null_positional : allow_null
end
def validate(_object, _context, value)
if value.nil? && !@allow_null
@message
end
end
end
end
end
end
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