Support to define mode by class style

[leaves4j]

Checklist

• [x] npm test passes
• [x] tests and/or benchmarks are included
• [x] documentation is changed or added
• [x] commit message follows commit guidelines

Affected core subsystem(s)

Description of change

Support to define mode by class style

// app/model/user.js
const { Sequelize, Model } = require('egg-sequelize');
const { STRING, INTEGER, DATE } = Sequelize;

class User extends Model {
  static get modelOptions() {
    const modelName = 'user';
    const attributes = {
      login: STRING,
      name: STRING(30),
      password: STRING(32),
      age: INTEGER,
      last_sign_in_at: DATE,
      created_at: DATE,
      updated_at: DATE,
    };
    const options = {};
    return { modelName, attributes, options };
  }

  async logSignin() {
    await this.update({ last_sign_in_at: new Date() });
  }

  static findByLogin(login) {
    return this.findOne({ login });
  }
}

module.exports = User;

Loader will check whether the model class has the modelOptions property, and then automatically initialize the model.

[codecov-io]

Codecov Report

Merging #35 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #35   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      6    +1     
  Lines          37     48   +11     
=====================================
+ Hits           37     48   +11

Impacted Files	Coverage Δ
index.js	100% <100%> (ø)
lib/loader.js	100% <100%> (ø)	:arrow_up:

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