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removeDuplicates.js
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removeDuplicates.js
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const debug = require('debug')('removeDuplicates');
const config = require('../config');
/**
* Recursively removes duplicate objects from array properties
* @param {Object} obj - Object to check
* @param {Array<Object>} props - obj properties that should be checked
* @param {String} props.name - obj property to parse
* @param {String>} props.filterBy - element property value that should be unique
* @param {Array<Object>} props.filterProps - extra element properties to check
* @returns {Object} - Parsed object
*/
const remove = (obj, props) => {
debug('remove: %d %j', Object.keys(obj).length, props);
const parsedProps = {};
// Check object properties
props.forEach((prop) => {
// NOTE: we are assuming
// - obj[name] exists and is an array
// - obj[name][*][filterBy] exists and is a scalar
const { name, filterBy, filterProps } = prop;
let parsedValue;
// If filterBy is present attempt to remove duplicates
if (filterBy) {
const ids = {};
parsedValue = [];
obj[name].forEach((el, idx) => {
if (ids[el[filterBy]] === undefined) {
ids[el[filterBy]] = idx;
parsedValue.push(el);
}
});
// otherwise simply copy reference
} else {
parsedValue = obj[name];
}
// If filterProps exists process further each array element
parsedProps[name] = filterProps
? parsedValue.map((el) => remove(el, filterProps))
: parsedValue;
});
return {
...obj,
...parsedProps,
};
};
/**
* Remove application schema duplicates
* @param {Object} schema - Application schema
* @param {Array<Object> filter - Application schema fields to parse
* @returns {Object} - Application schema without duplicates
*/
// eslint-disable-next-line
const removeDuplicates = (schema, filter = config.filter) => {
// TODO validate schema / filter
// I would use a JSON schema validator such as AJV:
// - https://github.com/ajv-validator/ajv
return remove(schema, filter);
};
module.exports = removeDuplicates;