Node.js NodeJS:如何实现存储库模式
我想在我的NodeJS应用程序中实现存储库模式,但我在循环需求方面遇到了麻烦(我猜…) 我如何尝试实施它:Node.js NodeJS:如何实现存储库模式,node.js,repository-pattern,Node.js,Repository Pattern,我想在我的NodeJS应用程序中实现存储库模式,但我在循环需求方面遇到了麻烦(我猜…) 我如何尝试实施它: PersonRepository类及其方法:getAll、getById、create、update、delete 方法为:init、createAccount、showRelations、addRelations、 首先:我的存储库模式设计正确吗? 我的班级: personRepository.js const PersonModel = require('./model'); co
- PersonRepository类及其方法:getAll、getById、create、update、delete
- 方法为:init、createAccount、showRelations、addRelations、
const PersonModel = require('./model');
const Person = require('./person');
class PersonRepository {
constructor() {
this._persons = new Set();
}
getAll( cb ) { // To Do: convert to promise
let results = new Set();
PersonModel.find({}, 'firstName lastName', (err, people) => {
if (err) {
console.error(err);
}
people.forEach((person, index) => {
let foundPerson = new Person(person._id.toString(), person.firstName, person.lastName, person.email, person.birthday);
results.add(foundPerson);
});
this._persons = results;
if (cb) cb(this._persons);
});
}
getById(id) {
return PersonModel.findOne({ _id: id });
}
getByEmail(email) {
throw new Error("Method not implemented");
}
create( person ) {
throw new Error("Method not implemented");
}
update ( person ) {
throw new Error("Method not implemented");
}
delete ( person ) {
throw new Error("Method not implemented");
}
}
module.exports = new PersonRepository();
const PersonModel = require('./model');
const personRepository = require('./personRepository');
class Person {
constructor(personId, first, last, email, birthday) {
this._id = personId ? personId : undefined;
this._firstName = first ? first : undefined;
this._lastName = last ? last : undefined;
this._email = email ? email : undefined;
this._birthday = birthday ? new Date(birthday) : undefined;
this._relations = new Map();
}
init() { // Get all data from database
personRepository.getById(this._id)
.then(console.log)
.catch(console.error);
}
}
module.exports = Person;
console.log("--- GET ALL : results--- ");
personRepository.getAll( (persons) => {
for (let person of persons) {
person.loadAllData()
.then(() => {
console.log(person);
})
.catch((e) => {
console.log(e);
});
}
});
console.log("--- INIT : results--- ");
var personInit = new Person("59c18a9029ef510012312995");
console.log("before init");
console.log(personInit);
personInit.init();
console.log("after init");
console.log(personInit);
person.js
const PersonModel = require('./model');
const Person = require('./person');
class PersonRepository {
constructor() {
this._persons = new Set();
}
getAll( cb ) { // To Do: convert to promise
let results = new Set();
PersonModel.find({}, 'firstName lastName', (err, people) => {
if (err) {
console.error(err);
}
people.forEach((person, index) => {
let foundPerson = new Person(person._id.toString(), person.firstName, person.lastName, person.email, person.birthday);
results.add(foundPerson);
});
this._persons = results;
if (cb) cb(this._persons);
});
}
getById(id) {
return PersonModel.findOne({ _id: id });
}
getByEmail(email) {
throw new Error("Method not implemented");
}
create( person ) {
throw new Error("Method not implemented");
}
update ( person ) {
throw new Error("Method not implemented");
}
delete ( person ) {
throw new Error("Method not implemented");
}
}
module.exports = new PersonRepository();
const PersonModel = require('./model');
const personRepository = require('./personRepository');
class Person {
constructor(personId, first, last, email, birthday) {
this._id = personId ? personId : undefined;
this._firstName = first ? first : undefined;
this._lastName = last ? last : undefined;
this._email = email ? email : undefined;
this._birthday = birthday ? new Date(birthday) : undefined;
this._relations = new Map();
}
init() { // Get all data from database
personRepository.getById(this._id)
.then(console.log)
.catch(console.error);
}
}
module.exports = Person;
console.log("--- GET ALL : results--- ");
personRepository.getAll( (persons) => {
for (let person of persons) {
person.loadAllData()
.then(() => {
console.log(person);
})
.catch((e) => {
console.log(e);
});
}
});
console.log("--- INIT : results--- ");
var personInit = new Person("59c18a9029ef510012312995");
console.log("before init");
console.log(personInit);
personInit.init();
console.log("after init");
console.log(personInit);
tests.js
const PersonModel = require('./model');
const Person = require('./person');
class PersonRepository {
constructor() {
this._persons = new Set();
}
getAll( cb ) { // To Do: convert to promise
let results = new Set();
PersonModel.find({}, 'firstName lastName', (err, people) => {
if (err) {
console.error(err);
}
people.forEach((person, index) => {
let foundPerson = new Person(person._id.toString(), person.firstName, person.lastName, person.email, person.birthday);
results.add(foundPerson);
});
this._persons = results;
if (cb) cb(this._persons);
});
}
getById(id) {
return PersonModel.findOne({ _id: id });
}
getByEmail(email) {
throw new Error("Method not implemented");
}
create( person ) {
throw new Error("Method not implemented");
}
update ( person ) {
throw new Error("Method not implemented");
}
delete ( person ) {
throw new Error("Method not implemented");
}
}
module.exports = new PersonRepository();
const PersonModel = require('./model');
const personRepository = require('./personRepository');
class Person {
constructor(personId, first, last, email, birthday) {
this._id = personId ? personId : undefined;
this._firstName = first ? first : undefined;
this._lastName = last ? last : undefined;
this._email = email ? email : undefined;
this._birthday = birthday ? new Date(birthday) : undefined;
this._relations = new Map();
}
init() { // Get all data from database
personRepository.getById(this._id)
.then(console.log)
.catch(console.error);
}
}
module.exports = Person;
console.log("--- GET ALL : results--- ");
personRepository.getAll( (persons) => {
for (let person of persons) {
person.loadAllData()
.then(() => {
console.log(person);
})
.catch((e) => {
console.log(e);
});
}
});
console.log("--- INIT : results--- ");
var personInit = new Person("59c18a9029ef510012312995");
console.log("before init");
console.log(personInit);
personInit.init();
console.log("after init");
console.log(personInit);
问题:
当运行“getall”测试(不包括INIT测试)时,它可以工作。
当我添加INIT测试时,会出现以下错误:
personRepository.getById(this._id)
^
TypeError: personRepository.getById is not a function
at Person.init
我怎样才能防止这种情况发生?
-更改我需要模块的方式?
-改变我的设计?(例如,不需要personRepository中的Person类,只需在“getAll”中创建一组ID,而不是一组Person)
-其他想法
谢谢你帮助我!我花了几个小时试图解决这个问题…我自己解决了。问题是两个模块之间存在循环依赖关系。通过将
require
s移动到模块后,可以解决此问题。导出
参考资料:链接已断开,请共享解决方案好吗?