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csvdb.js
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csvdb.js
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const fs = require('fs');
const path = require('path');
const Papa = require('papaparse');
const KeyQL = require('keyql');
const _ = require('lodash');
class CsvDb {
constructor(pathToCsv) {
this.pathToCsv = pathToCsv;
this.csv = fs.readFileSync(pathToCsv, 'utf-8');
this.papaObject = Papa.parse(this.csv, {
header: true,
dynamicTyping: true,
skipEmptyLines: true
});
if (this.papaObject.errors.length > 0) {
console.error(this.papaObject.errors);
throw new Error('Invalid Csv file');
}
this.kqlDataset = new KeyQL(this.papaObject.data);
}
save() {
const csv = Papa.unparse(this.papaObject.data);
fs.writeFileSync(this.pathToCsv, csv, 'utf-8');
return this.papaObject.data;
}
find(where) {
return this.kqlDataset.query().select([where]).values();
}
add(items) {
this.papaObject.data = this.papaObject.data.concat(items);
return this.papaObject.data
}
update(where, properties) {
const targets = this.find(where)
const mergedTargets = targets.map(target => _.merge(target, properties))
this.remove(where);
this.add(mergedTargets);
return mergedTargets;
}
remove(where) {
const targets = this.find(where)
this.papaObject.data = _.difference(this.papaObject.data, targets)
return targets;
}
static getDb(dbName) {
const csvFilePath = path.resolve(__dirname, `${dbName}.csv`);
if (!fs.existsSync(csvFilePath)) {
throw new Error('No such CSV file');
}
return new CsvDb(csvFilePath);
}
}
module.exports = CsvDb;