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/** |
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* Abstract Model class interacting with MongoDB |
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* |
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* @since 1.0.0 |
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*/ |
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const co = require('co'); |
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const mongodb = require('mongodb'); |
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const config = require('../config/server.config'); |
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const NotifierError = require('../common/Error'); |
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const MongoClient = mongodb.MongoClient; |
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const ObjectID = mongodb.ObjectID; |
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const url = process.env.MONGODB_URI || config.defaults.mongoDBUrl; |
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const logger = require('winston'); |
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/** |
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* @class |
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* @classdesc basic interactions with selected collection |
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*/ |
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class Model { |
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constructor(collection, indexes) { |
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if (new.target === Model) { |
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throw new TypeError('Cannot construct Model instances directly'); |
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} |
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this.collection = collection || this.constructor.name.toLowerCase(); |
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if (indexes instanceof Array) { |
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this.runQuery(col => col.createIndexes(indexes)) |
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.then(() => logger.log(`[DB] ${this.collection}'s index creation is successfully done.`)) |
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.catch(error => logger.error(`[DB] ${this.collection}'s index creation is failed.`, error)); |
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} |
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} |
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runQuery(fn) { |
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const self = this; |
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return co(function* () { |
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const db = yield MongoClient.connect(url); |
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const collection = db.collection(self.collection); |
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const result = yield fn.call(self, collection); |
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yield db.close(); |
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return result; |
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}).catch((err) => { |
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throw err; |
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}); |
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} |
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find(query, sort, skip, limit) { |
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if (query && query._id) { |
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query._id = ObjectID(query._id); |
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} |
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return this.runQuery((collection) => { |
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const cursor = collection.find(query || {}).sort(sort || {}); |
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if (typeof skip !== 'undefined' || typeof limit !== 'undefined') { |
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cursor.skip(skip).limit(limit); |
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} |
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return cursor.toArray(); |
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}).then(list => list.map((item) => { |
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item._id = item._id.toHexString(); |
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return item; |
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})).catch((error) => { |
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logger.error(error); |
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throw new NotifierError(NotifierError.Types.DB, {}, error); |
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}); |
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} |
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count(query) { |
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return this.runQuery(collection => collection.count(query || {})) |
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.catch((error) => { |
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logger.error(error); |
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throw new NotifierError(NotifierError.Types.DB, {}, error); |
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}); |
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} |
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add(model) { |
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return this.runQuery(collection => collection.insertOne(model)) |
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.then((result) => { |
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let data = result.ops; |
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if (data) { |
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data = result.ops.map(d => Object.assign({}, d, { _id: d._id.toHexString() })); |
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} |
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return { data, count: result.result.n }; |
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}) |
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.catch((error) => { |
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logger.error(error); |
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throw new NotifierError(NotifierError.Types.DB, {}, error); |
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}); |
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} |
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update(id, model, unset) { |
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return this.updateWithQuery({ _id: ObjectID(id) }, model, unset); |
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} |
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updateWithQuery(query, model, unset) { |
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const option = { $set: model }; |
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if (unset) { |
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option.$unset = unset; |
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} |
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return this.runQuery(collection => collection.findOneAndUpdate(query, option)) |
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.then(result => ({ data: [{ _id: result.value._id.toHexString() }], count: 1 })) |
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.catch((error) => { |
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logger.error(error); |
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throw new NotifierError(NotifierError.Types.DB, {}, error); |
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}); |
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} |
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remove(id) { |
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return this.runQuery(collection => collection.deleteOne({ _id: ObjectID(id) })) |
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.then(result => ({ data: [{ _id: id }], count: result.result.n })) |
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.catch((error) => { |
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logger.error(error); |
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throw new NotifierError(NotifierError.Types.DB, {}, error); |
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}); |
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} |
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} |
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module.exports = Model; |
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ridibooks /
simple-notifier
