TypeError: ids.filter is not a function

[atherdon]

https://sentry.io/atherdon/rapi/issues/438402486/

TypeError: ids.filter is not a function
  File "F:\code\NMTG\recipe-api-only\node_modules\loopback\node_modules\loopback-datasource-juggler\lib\relation-definition.js", line 3128, in ModelConstructor.modelFrom.validate.code
    var uniqueIds = ids.filter(function(id, pos) {
  File "F:\code\NMTG\recipe-api-only\node_modules\loopback\node_modules\loopback-datasource-juggler\lib\validations.js", line 382, in ModelConstructor.validateCustom
    conf.customValidator.call(this, err, done);
  File "F:\code\NMTG\recipe-api-only\node_modules\loopback\node_modules\loopback-datasource-juggler\lib\validations.js", line 656, in validationFailed
    validator.apply(inst, validatorArguments);
  File "F:\code\NMTG\recipe-api-only\node_modules\loopback\node_modules\loopback-datasource-juggler\lib\validations.js", line 546, in null.<anonymous>
    if (validationFailed(inst, attr, v)) {
  File "F:\code\NMTG\recipe-api-only\node_modules\loopback\node_modules\loopback-datasource-juggler\lib\validations.js", line 538, in null.<anonymous>
    attrValidations.forEach(function(v) {
...
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TypeError: ids.filter is not a function