# Check that a field is a JsonArray
#
# ~~~
# var validator = new ObjectValidator
# validator.add new RequiredField("id", required = true)
# validator.add new ArrayField("orders", allow_empty=false)
# assert not validator.validate("""{ "id": "", "orders": [] }""")
# assert validator.validate("""{ "id": "", "orders": [ 1 ] }""")
# ~~~
class ArrayField
	super RequiredField
	super ArrayValidator

	autoinit field=, required=, allow_empty=, length=

	redef var validation = new ValidationResult

	redef fun validate_field(v, obj) do
		if not super then return false
		var val = obj.get_or_null(field)
		if val == null then
			if required == null or required == true then
				v.validation.add_error(field, "Expected Array got `null`")
				return false
			else
				return true
			end
		end
		var res = validate_json(val)
		for field, messages in validation.errors do
			for message in messages do v.validation.add_error("{self.field}.{field}", message)
		end
		return res
	end
end