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38 lines
995 B
38 lines
995 B
'use strict';
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const CastError = require('../error/cast');
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/*!
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* Given a value, cast it to a string, or throw a `CastError` if the value
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* cannot be casted. `null` and `undefined` are considered valid.
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*
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* @param {Any} value
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* @param {String} [path] optional the path to set on the CastError
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* @return {string|null|undefined}
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* @throws {CastError}
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* @api private
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*/
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module.exports = function castString(value, path) {
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// If null or undefined
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if (value == null) {
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return value;
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}
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// handle documents being passed
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if (value._id && typeof value._id === 'string') {
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return value._id;
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}
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// Re: gh-647 and gh-3030, we're ok with casting using `toString()`
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// **unless** its the default Object.toString, because "[object Object]"
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// doesn't really qualify as useful data
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if (value.toString &&
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value.toString !== Object.prototype.toString &&
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!Array.isArray(value)) {
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return value.toString();
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}
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throw new CastError('string', value, path);
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};
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