69 lines
1.7 KiB
JavaScript
69 lines
1.7 KiB
JavaScript
exports.safeRequire = safeRequire;
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exports.fieldsToArray = fieldsToArray;
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exports.selectFields = selectFields;
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function safeRequire(module) {
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try {
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return require(module);
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} catch (e) {
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console.log('Run "npm install loopback-data ' + module + '" command to use loopback-data using ' + module + ' database engine');
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process.exit(1);
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}
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}
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function fieldsToArray(fields, properties) {
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if(!fields) return;
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// include all properties by default
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var result = properties;
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if(typeof fields === 'string') {
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return [fields];
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}
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if (Array.isArray(fields) && fields.length > 0) {
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// No empty array, including all the fields
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return fields;
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}
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if ('object' === typeof fields) {
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// { field1: boolean, field2: boolean ... }
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var included = [];
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var excluded = [];
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var keys = Object.keys(fields);
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if(!keys.length) return;
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keys.forEach(function (k) {
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if (fields[k]) {
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included.push(k);
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} else if ((k in fields) && !fields[k]) {
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excluded.push(k);
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}
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});
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if (included.length > 0) {
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result = included;
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} else if (excluded.length > 0) {
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excluded.forEach(function (e) {
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var index = result.indexOf(e);
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result.splice(index, 1);
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});
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}
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}
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return result;
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}
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function selectFields(fields) {
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// map function
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return function (obj) {
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var result = {};
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var key;
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for (var i = 0; i < fields.length; i++) {
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key = fields[i];
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result[key] = obj[key];
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}
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return result;
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}
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} |