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Can I define accessor with model?

See original GitHub issue

I want define accessor with model object like Laravel eloquent accessor. https://laravel.com/docs/5.6/eloquent-mutators#accessors-and-mutators

Is it possbile?

export default class Person extends Model {
  defaults() {
    return {
      id: null,
      firstName: '',
      lastName: ''
    };
  }

  get fullname() {
    return `${this.lastName} ${this.firstName} `;
  }
}

const person = new Person({firstName: 'Shu', lastName: 'Ogawa'});
console.log(person.fullname); // Ogawa Shu

Issue Analytics

State:
Created 5 years ago
Comments:5 (1 by maintainers)

Top GitHub Comments

1reaction

shuogawacommented, Aug 21, 2018

@sifex Thank you for reply.

I tried. But fullname is empty.

import { Model } from 'vue-mc';
export default class Person extends Model {
  defaults() {
    return {
      id: null,
      firstName: '',
      lastName: ''
    };
  }

  mutations() {
    return {
      fullName: () => 'this is dynamic field'
    };
  }
}

I had check by vue devtool. _mutations is empty object.

Where is wrong?

0reactions

alvaro-canepacommented, Jan 15, 2021

I made my own accessors method, based on mutations.

import Vue from "vue";
import { Model as BaseModel } from "vue-mc";
import _ from "lodash";

export default class Model extends BaseModel {
  _accessors!: Record<string, Accessor>;

  boot() {
    Vue.set(this, "_accessors", {});
    this.compileAccessors();
  }

  /**
   *  @returns {Object} Attribute accessor keyed by attribute name.
   */
  accessors(): Record<string, Accessor | Accessor[]> {
    return {};
  }

  /**
   * Compiles all accessors into pipelines that can be executed quickly.
   */
  compileAccessors(): void {
    this._accessors = _.mapValues(
      this.accessors(),
      (m: Accessor | Accessor[]): Accessor => _.flow(m as Accessor[])
    );

    this.on("sync", this.assignAccessors);
  }

  /**
   * Sync all accessors with model attributes
   */
  assignAccessors(): void {
    _.each(this._accessors, (fAccessor: Accessor, sKey) => {
      this.set(sKey, fAccessor());
    });
  }
}

export type Accessor = (value?: any) => any;

How to use

import Model from './Model';
import _ from "lodash";

export default class Person extends Model {
  defaults() {
    return {
      id: null,
      firstName: '',
      lastName: ''
    };
  }

  accessors() {
    return {
      fullName: () => {
        return _.chain([this.firstName, this.lastName])
          .compact()
          .join(" ")
          .value();
      }
    };
  }
}

const person = new Person({firstName: 'Shu', lastName: 'Ogawa'});
console.log(person.fullName); // Ogawa Shu