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mongoose.js
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mongoose.js
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const path = require("path");
const express = require(path.resolve('./') + "/node_modules/express");
const mongoose = require('mongoose');
// const mongoosePaginate = require("mongoose-paginate");
const mongoosePaginate = require("./paginate.js");
const beautifyUnique = require("mongoose-beautiful-unique-validation");
/**
* 更新数据库索引。
*
* 目前只删除已经不存在的索引，新添加的mongoose在必要时会自动添加。
*
* @constructor
*/
// const _updateIndexes = async function (app, db) {
// const models = Object.keys(db.models);
// let errorMsg = '';
// for (let i = 0; i < models.length; i += 1) {
// let allFields = [];
// let model = db.models[models[i]];
// // 获取数据库定义中的索引
// let index = [];
// const CheckFields = function (m) {
// const keys = Object.keys(m.schema.paths) || [];
// for (let i = 0; i < keys.length; i += 1) {
// let p = keys[i];
// let pp = m.schema.paths[p];
// if (pp._index !== null) {
// // pp._index.Name = p;
// // index.push(pp._index);
// // index.push(pp.path);
// index.push(pp);
// }
// if (pp.schema && pp.schema.paths) {
// CheckFields(pp);
// }
// // 同一个数据库表中，字段不能重复，除了数组（）。
// if (allFields.indexOf(pp.path) >= 0 &&
// allFields.indexOf(pp.path) !== allFields.lastIndexOf(pp.path) &&
// pp.path !== '_id' &&
// m.instance !== 'Array') {
// throw '数据表' + m.modelName + '存在重复的字段名' + pp.path;
// }
// else {
// allFields.push(pp.path);
// }
// }
// };
// CheckFields(model);
// if (!index || index.length <= 0) continue;
// // 获取数据库实际所有的索引
// let rIndex = 0;
// try {
// rIndex = await ((model.collection).indexes());
// } catch (e) {
// app.logger.error(e.stack);
// }
// if (!rIndex || rIndex.length < 0) continue;
// for (let j = 0; j < rIndex.length; j += 1) {
// // TODO: 假设索引中只有一个key，目前没问题，但以后有风险！
// const key = Object.keys(rIndex[j].key)[0];
// if (key === '_id') continue;
// const index_ind = index.findIndex((pp) => { return pp.path === key; });
// if (index_ind >= 0) {
// index.splice(index_ind, 1);
// continue;
// }
// // 删除已经不存在的index
// await model.collection.dropIndex(rIndex[j].name);
// }
// // 到这里，如果index列表里还有，说明需要添加新index，但不能自动添加，因为生产环境会影响性能。提示去手动添加。
// if (index.length > 0) {
// errorMsg = errorMsg || (model.modelName + ' 需要手动创建索引: \n');
// for (let k = 0; k < index.length; ++k) {
// const ind = index[k];
// errorMsg += 'db.' + model.collection.name + '.createIndex({' + ind.path + ': 1}, {unique: ' + !!ind._index.unique + ', sparse: ' + !!ind._index.sparse + '})\n';
// }
// }
// }
// if (errorMsg) {
// app.logger.error(errorMsg);
// process.exit(-1);
// }
// };
module.exports = (app, mdl) => {
const config = mdl.config;
const connectionString = `mongodb://${config.dbHost}:${config.dbPort}/${config.dbName}`;
// mongoose.Promise = global.Promise;//如果有promise的问题，可以用这个试试
app.logger.debug(`正在连接数据库(${process.env.NODE_ENV}): ${connectionString}`)
const tryConnect = () => {
mongoose.connect(connectionString, { useNewUrlParser: true, autoIndex: config.autoCreateIndexes || false });//连接mongodb数据库
}
tryConnect();
// 实例化连接对象
let db = mongoose.connection;
db.tryConnect = tryConnect;
db.validateSchema = async function () {
if (!db) {
throw 'Not connected tot he db yet!';
}
const models = Object.keys(db.models);
let errorMsg = '';
for (let i = 0; i < models.length; i += 1) {
let allFields = [];
let model = db.models[models[i]];
// 获取数据库定义中的索引
let index = [];
const CheckFields = function (m) {
const keys = Object.keys(m.schema.paths) || [];
for (let j = 0; j < keys.length; j += 1) {
let p = keys[j];
let pp = m.schema.paths[p];
if (pp._index !== null) {
// pp._index.Name = p;
// index.push(pp._index);
// index.push(pp.path);
index.push(pp);
}
if (pp.schema && pp.schema.paths) {
CheckFields(pp);
}
// 同一个数据库表中，字段不能重复，除了数组（）。
if (allFields.indexOf(pp.path) >= 0 &&
allFields.indexOf(pp.path) !== allFields.lastIndexOf(pp.path) &&
pp.path !== '_id' &&
m.instance !== 'Array') {
throw '数据表' + m.modelName + '存在重复的字段名' + pp.path;
}
else {
allFields.push(pp.path);
}
}
// custimized indexes
if (m.schema._indexes) {
for (let j = 0; j < m.schema._indexes.length; j += 1) {
const _ind = m.schema._indexes[j];
if (_ind && Array.isArray(_ind) && _ind[0]) {
index.push({
path: _ind[0],
_index: _ind[1] || {}
});
}
}
}
};
CheckFields(model);
if (!index || index.length <= 0) continue;
// 获取数据库实际所有的索引
let rIndex = 0;
try {
rIndex = await ((model.collection).indexes());
} catch (e) {
app.logger.error(e.stack);
}
if (!rIndex || rIndex.length < 0) continue;
for (let j = 0; j < rIndex.length; j += 1) {
// TODO: 假设索引中只有一个key，目前没问题，但以后有风险！
// const key = Object.keys(rIndex[j].key)[0];
// if (key === '_id') continue;
// const index_ind = index.findIndex((pp) => { return pp.path === key; });
// if (index_ind >= 0) {
// index.splice(index_ind, 1);
// continue;
// }
const keys = Object.keys(rIndex[j].key);
if (keys && keys.length === 1 && keys[0] === '_id') continue;
const index_ind = index.findIndex((pp) => {
if (typeof pp.path === 'string' && keys.length === 1) {
return pp.path === keys[0];
} else if (typeof pp.path === 'object' && keys.length > 1) {
const defKeys = Object.keys(pp.path);
const dupKeys = [];
for (let k = 0; k < keys.length; k += 1) {
const key = keys[k];
if (defKeys.indexOf(key) >= 0) {
dupKeys.push(key);
}
}
if (defKeys.length === dupKeys.length) {
return true;
}
return false;
} else {
return false;
}
});
if (index_ind >= 0) {
index.splice(index_ind, 1);
continue;
}
// 删除已经不存在的index
await model.collection.dropIndex(rIndex[j].name);
}
// 到这里，如果index列表里还有，说明需要添加新index，但不能自动添加，因为生产环境会影响性能。提示去手动添加。
if (index.length > 0) {
// 如果系统设置允许自动创建索引，则自动创建，否则报错提醒开发人员手动创建
if (config.autoCreateIndexes) {
// 如果配置允许自动创建索引，则建立数据库连接时即可配置自动创建，而不需要这里人为创建
// app.logger.warn(`自动创建索引：${model.collection.name}: ${index.map(idx => JSON.stringify(idx.path))}`);
// model.createIndexes();
} else {
errorMsg = errorMsg || (model.modelName + ' 需要手动创建索引: \n');
for (let k = 0; k < index.length; ++k) {
const ind = index[k];
errorMsg += 'db.' + model.collection.name + '.createIndex(' + (typeof ind.path === 'string' ? `{'${ind.path}': 1}` : JSON.stringify(ind.path)) + ', {unique: ' + !!ind._index.unique + ', sparse: ' + !!ind._index.sparse + '})\n';
}
}
}
}
if (errorMsg) {
app.logger.error(errorMsg);
process.exit(-1);
}
};
db.on('error', (err) => {
app.logger.error('连接数据库失败!! ' + err);
});
db.once('open', async () => {
app.logger.info('开始整理数据库……');
// let Config = await SystemConfig.findOne({});
// if (!Config) {
// // 还没有系统配置
// Config = await SystemConfig.create({
// Version: '0.0.1'
// });
// }
try {
app.logger.info('重建数据库索引……');
await db.validateSchema();
app.logger.info('重建数据库索引成功！');
// if (Config.Version !== app.ctx.version) {
// app.logger.info('运行数据库升级脚本……');
// const uScripts = Scripts.Upgrade || [];
// for (let i = 0; i < uScripts.length; i += 1) {
// let s = uScripts[i].name;
// // 判断获取的脚本是否适合在当前版本中运行
// if (s.indexOf('U') !== 0) continue;
// s = s.substr(1);
// if (s.indexOf('_') < 0) continue;
// s = s.split('_');
// if (s.length < 2) continue;
// const from = Number(s[0]);
// const to = Number(s[1]);
// if (!from || !to) continue;
// if (from < Config.Version) continue;
// if (to > app.ctx.version) continue;
// // 运行数据库升级脚本
// await uScripts[i]();
// }
// app.logger.info('运行数据库升级脚本成功！');
// }
}
catch (e) {
app.logger.error('整理数据库失败！\n' + e);
process.exit(-1);
}
// // 更新当前版本到配置文件
// if (Config.Version !== app.ctx.version) {
// Config.Version = app.ctx.version;
// await Config.save();
// }
app.db.__ready = true;
app.logger.info('连接数据库成功!');
});
/**
* * Init database tables (collections) schemas according to the definition in the module
* * or use a schema specified in the function parameter
*/
db.initModuleSchema = function (app, mdl, s) {
mdl.data = mdl.data || {};
const schemas = s || mdl.data;
mdl.models = mdl.models || {};
app.models = app.models || {};
Object.keys(schemas).forEach(k => {
if (app.models[k] && typeof app.models[k] === 'function') {
// already exists
app.logger.error(`Module '${mdl.name}' : DB model ${k} is already exists!`)
return;
}
// get the schema definition of each collection
let d = schemas[k];
if (!d) return;
// add default fields if not exist yet
d['LastUpdateDate'] || (d['LastUpdateDate'] = { type: "Date", index: true });
d['CreatedDate'] || (d['CreatedDate'] = { type: "Date", index: true });
d['id'] = {
type: "String",
unique: true,
default: function () {
return this._id.toString();
},
// set: function () {
// return this._id.toString();
// }
};
d['Saved'] || (d['Saved'] = { type: "Boolean" });
d['Deleted'] || (d['Deleted'] = { type: "Boolean", default: false });
// change the data type according to the string
function processFieldSchema (d) {
Object.keys(d).forEach(dk => {
if (d[dk] && d[dk].type && typeof d[dk].type === 'string') {
switch (d[dk].type.toLowerCase()) {
case 'string':
d[dk].type = String;
break;
case 'boolean':
d[dk].type = Boolean;
break;
case 'date':
d[dk].type = Date;
break;
case 'id':
// no mongoose objectid, always use String
d[dk].type = String;
break;
case 'number':
d[dk].type = Number;
break;
case 'array':
// d[dk].type = Array;
d[dk].type = mongoose.Schema.Types.Mixed;
break;
case 'object':
d[dk].type = mongoose.Schema.Types.Mixed;
break;
}
if (d[dk].refer) {
d[dk].ref = d[dk].refer;
}
} else if (Array.isArray(d[dk])) {
// is an array
if (dk === '__Indexes' || dk === '__Virtuals') {
//
} else {
d[dk].forEach(da => processFieldSchema(da));
}
} else if (typeof d[dk] === 'object') {
// nested object
Object.keys(d[dk]).forEach(ndk => {
processFieldSchema(d[dk][ndk]);
})
}
})
}
processFieldSchema(d);
// merge fields if we already have such collection from other modules
Object.keys(app.models).forEach(mk => {
const appModel = app.models[mk];
if (appModel.modelShortName === k) {
d = Object.merge(d, appModel.schemaDefinition);
}
})
// extend with the extend schema defined in config
if (config && config.extendSchema) {
const extendDef = config.extendSchema[k];
if (extendDef) {
d = Object.assign(d, extendDef)
}
}
const model = {};
model.modelShortName = k;
model.schemaDefinition = d;
// attach the model to the module instance.
mdl.models[k] = model;
// attach the model to the application.
app.models[k] = model;
});
};
/**
* After get all the model schema ready, we use this function to create the data models.
* All the data models will stored in app.models, and only the data models defined in a module will be stored in the module.models.
*/
db.initModuleModel = function (app, mdl, mList) {
const modelList = mList || mdl.models;
let forceDate;
if (mdl && mdl.config && typeof mdl.config.forceDate === 'boolean') {
forceDate = mdl.config.forceDate;
} else {
forceDate = config.forceDate;
}
Object.keys(modelList).forEach(mk => {
const model = app.models[mk];
if (model.modelName) {
// this model was created already.
mdl.models[mk] = model;
} else {
// not created yet
// generate the db model
const schemaName = `${mk}Schema`;
const schemaObject = {};
// indexes
let INDEXES = model.schemaDefinition.__Indexes;
if (INDEXES && Array.isArray(INDEXES)) {
delete model.schemaDefinition.__Indexes;
}
INDEXES = INDEXES || [];
// virtuals
let VIRTUALS = model.schemaDefinition.__Virtuals;
if (VIRTUALS && Array.isArray(VIRTUALS)) {
delete model.schemaDefinition.__Virtuals;
}
VIRTUALS = VIRTUALS || [];
schemaObject[schemaName] = new mongoose.Schema(model.schemaDefinition, { __v: false });
// indexes
for (let i = 0; i < INDEXES.length; i += 1) {
const ind = INDEXES[i];
if (ind && ind.def) {
schemaObject[schemaName].index(ind.def, ind.set || {});
}
}
// virtuals
for (let i = 0; i < VIRTUALS.length; i += 1) {
const virt = VIRTUALS[i];
if (virt && virt.name) {
schemaObject[schemaName].virtual(virt.name).get(virt.get || (() => { })).set(virt.set || (() => { }));
}
}
schemaObject[schemaName].plugin(mongoosePaginate);
schemaObject[schemaName].plugin(beautifyUnique, {
defaultMessage: config.defaultBeautifyUniqueMessage || 'The field is not unique!'
});
/**
* 在更新数据文档时自动设置LastUpdateDate到当前的时间，这样其他代码中就不需要再特别设置此数据。
*/
schemaObject[schemaName].pre("save", function (next) {
if (forceDate || !this.LastUpdateDate)
this.LastUpdateDate = new Date();
if (this.isNew && (forceDate || !this.CreatedDate))
this.CreatedDate = new Date();
if (!this.isNew)
this.Saved = true;
return next();
});
schemaObject[schemaName].pre("update", function (next) {
if (forceDate || !this.LastUpdateDate)
this.LastUpdateDate = new Date();
this.Saved = true;
return next();
});
schemaObject[schemaName].pre("updateOne", function (next) {
if (forceDate || !this.LastUpdateDate)
this.LastUpdateDate = new Date();
this.Saved = true;
return next();
});
schemaObject[schemaName].pre("updateMany", function (next) {
if (forceDate || !this.LastUpdateDate)
this.LastUpdateDate = new Date();
this.Saved = true;
return next();
});
schemaObject[schemaName].pre("create", function (next) {
if (forceDate || !this.CreatedDate)
this.CreatedDate = new Date();
if (forceDate || !this.LastUpdateDate)
this.LastUpdateDate = new Date();
return next();
});
// customized hooks
const cusHooks = model.hooks || (app.__modelHooks && app.__modelHooks[mk]) || [];
cusHooks.forEach(hook => {
if(!hook || !hook.hook || !hook.method || !hook.func) return;
if(hook.hook === 'post') {
schemaObject[schemaName].post(hook.method, hook.options, hook.func);
} else if(hook.hook === 'pre') {
schemaObject[schemaName].pre(hook.method, hook.options, hook.func);
}
});
// const newModel = mongoose.model(`${mdl.name}_${mk}`, schemaObject[schemaName]);
const newModel = mongoose.model(mk, schemaObject[schemaName]);
Object.assign(newModel, model);
// attach the model to module
mdl.models[mk] = newModel;
// attach the model to the app
app.models[mk] = newModel;
}
})
};
async function _dataProcessMiddleware (req, res, next) {
if (!res.locals.CURD || res.locals.CURD.length <= 0) return next();
if (res.locals.err) return next();
const mongooseDbHelper = require('./dbhelper')(app);
for (let i = 0; i < res.locals.CURD.length; i += 1) {
if (res.locals.cancel) break;
const op = res.locals.CURD[i];
if (op.model) {
// restore the context
res.locals.filter = op.ctx.filter;
res.locals.options = op.ctx.options;
res.locals.fields = op.ctx.fields;
res.locals.body = op.ctx.body;
res.locals.doc = op.ctx.doc;
// do the real db operations according to the given method
// TODO: add transaction
switch (op.method.toLowerCase()) {
case 'r':
await mongooseDbHelper.FindDocuments(op.model)(req, res);
break;
case 'ra':
await mongooseDbHelper.FindAllDocuments(op.model)(req, res);
break;
case 'c':
await mongooseDbHelper.CreateDocument(op.model)(req, res);
break;
case 'u':
await mongooseDbHelper.UpdateDocument(op.model)(req, res);
break;
case 'd':
await mongooseDbHelper.DeleteDocument(op.model)(req, res);
break;
case 'a':
await mongooseDbHelper.Aggregate(op.model)(req, res);
break;
default:
break;
}
}
// call callbacks in order
for (let j = 0; j < op.cbs.length; j += 1) {
await op.cbs[j](req, res, op);
}
}
if (!res.locals.NONEXT)
return next();
}
db.dataProcessMiddleware = _dataProcessMiddleware;
/**
* Replace the default express.Router funtion so that we can attach all the db helper function to the router instance.
* And after this we can use these db helpers from middleware.
*/
const curdFunc = (method = 'R') => {
return (model, overwrite = true, callback) => {
return (req, res, next) => {
if(res.locals.__cancelOnce || res.locals.cancel) {
return next && next();
}
res.locals = res.locals || {};
res.locals.body = res.locals.body || {};
res.locals.doc = res.locals.doc || {};
res.locals.CURD = res.locals.CURD || [];
const existOp = res.locals.CURD.find(m => m.method === method && m.model === model)
if (res.locals.CURD.length <= 0 || !overwrite || !existOp) {
const filter = Object.assign({}, res.locals.filter);
const options = res.locals.options ? res.locals.options : Object.assign({}, res.locals.options);
const fields = Object.assign([], res.locals.fields);
const body = Object.assign({}, res.locals.body);
const doc = Object.assign({}, res.locals.doc);
res.locals.CURD.push({
method: method,
model: model,
ctx: {
filter: filter,
options: options,
fields: fields,
body: body,
doc: doc
},
cbs: callback ? [callback] : []
});
} else {
// merge ctx
Object.merge(existOp.ctx, {
filter: res.locals.filter,
options: res.locals.options,
body: res.locals.body,
doc: res.locals.doc
})
// fields
if (res.locals.fields && Array.isArray(res.locals.fields) && res.locals.fields.length > 0) {
if (!existOp.ctx.fields || !Array.isArray(existOp.ctx.fields)) {
existOp.ctx.fields = res.locals.fields;
} else {
for (let i = 0; i < res.locals.fields.length; i += 1) {
const nField = res.locals.fields[i];
if (existOp.ctx.fields.indexOf(nField) < 0) {
existOp.ctx.fields.push(nField);
}
}
}
}
// callback
if (callback && typeof callback === 'function') {
existOp.cbs = existOp.cbs || [];
existOp.cbs.push(callback);
}
}
if (next)
return next();
}
};
}
const _expressRouter = express.Router;
express.Router = function () {
let router = _expressRouter();
router.FindDocuments = curdFunc('R')
router.FindAllDocuments = curdFunc('RA')
router.CreateDocument = curdFunc('C')
router.UpdateDocument = curdFunc('U')
router.DeleteDocument = curdFunc('D')
router.Aggregate = curdFunc('A')
return router;
};
// attach the db operations to app
app.FindDocuments = curdFunc('R')
app.FindAllDocuments = curdFunc('RA')
app.CreateDocument = curdFunc('C')
app.UpdateDocument = curdFunc('U')
app.DeleteDocument = curdFunc('D')
app.Aggregate = curdFunc('A')
return db;
};