用mixin扩展的node.js对象在实例化后找不到函数

Question

我已经设法为我的 mixin 设置了一个相当复杂的设置（尽管这是 Code Review 的问题），如下所示：

TooManyCaps.js

module.exports = {
  labelCopyCaps: () => {
    if (this.release.tracks.length > 1) {
      if (_this._notEnoughLowercase(this.release.title)) {
        this._recordError(release, 'LABELCOPYCAPS');
      } else {
        this.release.tracks.some( (track) => {
          if (this._lowerCaseCount(track.label_copy)) {
            this._recordError(release, 'LABELCOPYCAPS');
            return true;
          }
        });
      }
    }
  },
  _notEnoughLowercase: (str) => {
    if ((str.match(/[a-zA-Z]/g)||[]).length > 3
        && str.length - str.replace(/[a-z]/g, '').length) {
      return true;
    }
    return false;
  }
};

然后我有一个可以将其用作混合的对象：

Rule.js

class Rule {
  constructor(release) {
    this.release = release;
    this.errors = [];
  }

  _recordError(error, options) {
    this.errors.push({
      release_id: this.release.id,
      rule: error,
      options: options,
    });
  }
}

module.exports = Rule;

然后我有一个索引页面将它们连接在一起

index.js

const TooManyCaps = require('./TooManyCaps');
const Rule = require('./Rule');
Object.assign(Rule.prototype, [TooManyCaps]);
module.exports = Rule;

然后是我的程序的主要开始，该程序会进行一些实例化：

'use strict';
const RuleValidator = require('./job/validation/RuleValidatorMixin');
const Rule = require('./job/validation/rulesmixins/rules/index');

// some logic that's a loop
arr.forEach((value) => {
  new RuleValidator(new Rule(value)).validate();
}

在 validate() 中我有：

  validate() {
    console.log('VALIDATE');
    this.rule.labelCopyCaps();
    // console.log(this.rule);
  }

但是当我运行它时，我得到：

this.rule.labelCopyCaps is not a function

那么我哪里出错了？

Answer 1

Object.assign 不带数组：

Object.assign(Rule.prototype, [TooManyCaps]);
//                            ^           ^

应该只是

Object.assign(Rule.prototype, TooManyCaps);