算法评测平台前端。
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8 years ago
/*
* This file is part of SYZOJ.
*
* Copyright (c) 2016 Menci <huanghaorui301@gmail.com>
*
* SYZOJ is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* SYZOJ is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with SYZOJ. If not, see <http://www.gnu.org/licenses/>.
*/
'use strict';
class Model {
constructor(record) {
this.record = record;
this.loadFields();
}
loadFields() {
let model = this.getModel();
let obj = JSON.parse(JSON.stringify(this.record.get({ plain: true })));
for (let key in obj) {
if (model.tableAttributes[key].json) {
try {
this[key] = eval(`(${obj[key]})`);
} catch (e) {
this[key] = {};
}
} else this[key] = obj[key];
}
}
toPlain() {
let model = this.getModel();
let obj = JSON.parse(JSON.stringify(this.record.get({ plain: true })));
for (let key in obj) {
if (model.tableAttributes[key].json) obj[key] = JSON.stringify(this[key]);
else obj[key] = this[key];
}
return obj;
}
async save() {
let obj = this.toPlain();
for (let key in obj) this.record.set(key, obj[key]);
let isNew = this.record.isNewRecord;
await this.record.save();
if (!isNew) return;
await this.reload();
}
async reload() {
await this.record.reload();
this.loadFields();
}
async destroy() {
return this.record.destroy();
}
static async fromRecord(record) {
record = await record;
if (!record) return null;
return new this(await record);
}
static async fromID(id) {
return this.fromRecord(this.model.findById(id))
}
static async findOne(options) {
return this.fromRecord(this.model.findOne(options));
}
static async all() {
return (await this.model.findAll()).mapAsync(record => (this.fromRecord(record)));
}
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static async count(where) {
// count(sql)
if (typeof where === 'string') {
let sql = where;
return syzoj.db.countQuery(sql);
}
// count(where)
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return this.model.count({ where: where });
}
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static async query(paginate, where, order) {
let records = [];
if (typeof paginate === 'string') {
// query(sql)
let sql = paginate;
records = await syzoj.db.query(sql, { model: this.model });
} else {
if (paginate && !Array.isArray(paginate) && !paginate.pageCnt) return [];
let options = {
where: where,
order: order
};
if (Array.isArray(paginate)) {
options.offset = paginate[0] - 1;
options.limit = paginate[1] - paginate[0] + 1;
} else if (paginate) {
options.offset = (paginate.currPage - 1) * paginate.perPage;
options.limit = parseInt(paginate.perPage);
}
records = await this.model.findAll(options);
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}
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return records.mapAsync(record => (this.fromRecord(record)));
}
}
module.exports = Model;