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dao.js
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dao.js
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const mongodb = require("./mongodb");
const _ = require("lodash");
const { DAOResponse } = require("./utils/responses");
const Collection = {
Judge: "Judge",
Country: "Country"
}
const ErrorCode = {
CANNOT_GET_ALL_RECORDS : "CANNOT_GET_ALL_RECORDS",
CANNOT_GET_SPECIFIC_RECORD : "CANNOT_GET_SPECIFIC_RECORD",
RECORD_ALREADY_EXISTS : "RECORD_ALREADY_EXISTS",
NO_RECORD_INSERTED : "NO_RECORD_INSERTED",
CANNOT_INSERT_RECORD : "CANNOT_INSERT_RECORD",
NO_RECORD_UPDATED : "NO_RECORD_UPDATED",
CANNOT_UPDATE_RECORD : "CANNOT_UPDATE_RECORD",
NO_RECORD_DELETED : "NO_RECORD_DELETED",
CANNOT_DELETE_RECORD : "CANNOT_DELETE_RECORD"
}
class DAO {
/**
* DAO constructor
* @param {string} collection
*/
constructor(collection) {
if (collection == Collection.Judge) {
this.collection = mongodb.judges;
this.filter = "code";
}
else if (collection == Collection.Country) {
this.collection = mongodb.countries;
this.filter = "code";
}
}
/**
* Creates the Document filter
* @param {string} id The key
* @returns {object}
*/
getFilter(id) {
return { [this.filter]: id };
}
/**
* Gets all records
* @param {Filter<Document>} filterQuery The filter predicate
* @returns {Promise<DAOResponse>}
*/
async getAll(filterQuery = {}) {
try {
const result = await this.collection.find(filterQuery).toArray();
return DAOResponse.createSuccessfulResponse(result);
}
catch {}
return DAOResponse.createFailedResponse(ErrorCode.CANNOT_GET_ALL_RECORDS);
}
/**
* Gets all records sorted
* @param {Filter<Document>} filterQuery The filter predicate
* @param {boolean} descending False for ascending and true for ascending
* @param {...string} sortFields Fields to be sorted
* @returns {Promise<DAOResponse>}
*/
async getAllSorted(filterQuery = {}, descending = false, ...sortFields) {
const descendingFilter = descending ? -1 : 1;
let sortFilter = {};
for (var sortField of sortFields) {
sortFilter[sortField] = descendingFilter;
}
try {
const result = await this.collection.find(filterQuery).sort(sortFilter).toArray();
return DAOResponse.createSuccessfulResponse(result);
}
catch {}
return DAOResponse.createFailedResponse(ErrorCode.CANNOT_GET_ALL_RECORDS);
}
/**
* Gets a specific record
* @param {string} id The key of the record we want to get
* @returns {Promise<DAOResponse>}
*/
async getSpecific(id) {
const filter = this.getFilter(id);
try {
const result = await this.collection.findOne(filter);
return DAOResponse.createSuccessfulResponse(result);
}
catch { }
return DAOResponse.createFailedResponse(ErrorCode.CANNOT_GET_SPECIFIC_RECORD);
}
/**
* Inserts a new record
* @param {*} data Data we want to insert
* @param {*} fieldsToOmit Fields we want to omit and not store
* @returns {Promise<DAOResponse>}
*/
async insert(data, fieldsToOmit = null) {
if (fieldsToOmit != null) data = _.omit(data, fieldsToOmit);
if (data[this.filter] != null) {
try {
const ack = await this.collection.insertOne(data);
if (ack.insertedId != null) {
return DAOResponse.createSuccessfulResponse();
}
}
catch (error) {
if (error.message.includes("E11000")) {
return DAOResponse.createFailedResponse(ErrorCode.RECORD_ALREADY_EXISTS);
}
return DAOResponse.createFailedResponse(ErrorCode.NO_RECORD_INSERTED);
}
}
return DAOResponse.createFailedResponse(ErrorCode.CANNOT_INSERT_RECORD);
}
/**
* Updates a record
* @param {*} id The key of the record we want to be updated
* @param {*} updatedData Data we want to be updated
* @returns
*/
async update(id, updatedData) {
const filter = this.getFilter(id);
const updatedDoc = { $set: updatedData };
try {
const ack = await this.collection.updateOne(filter, updatedDoc);
if (ack.modifiedCount == 0) {
return DAOResponse.createFailedResponse(ErrorCode.NO_RECORD_UPDATED);
}
else {
return DAOResponse.createSuccessfulResponse();
}
}
catch { }
return DAOResponse.createFailedResponse(ErrorCode.CANNOT_UPDATE_RECORD);
}
/**
* Deletes a record
* @param {*} id The key of the record we want to be deleted
* @returns
*/
async delete(id) {
const filter = this.getFilter(id);
try {
const ack = await this.collection.deleteOne(filter);
if (ack.deletedCount == 0) {
return DAOResponse.createFailedResponse(ErrorCode.NO_RECORD_DELETED);
}
else {
return DAOResponse.createSuccessfulResponse();
}
}
catch { }
return DAOResponse.createFailedResponse(ErrorCode.CANNOT_DELETE_RECORD);
}
}
module.exports = {
DAO,
Collection
};