context.js

import merge from 'lodash/merge'
import find from 'lodash/find'
import { VuexOrmPluginConfig } from '../support/interfaces';

export default class Context {
  /**
   * Private constructor, called by the setup method
   *
   * @constructor
   * @param {Components} components The Vuex-ORM Components collection
   * @param {Options} options The options passed to VuexORM.install
   */
  constructor(components, options) {
    this.components = components;
    this.options = merge({}, VuexOrmPluginConfig, options);
    this.database = options.database;

    if (!options.database) {
      throw new Error('database option is required to initialise!');
    }
  }

  /**
   * This is called only once and creates a new instance of the Context.
   * @param {Components} components The Vuex-ORM Components collection
   * @param {Options} options The options passed to VuexORM.install
   * @returns {Context}
   */
  static setup(components, options) {
    this.instance = new Context(components, options);
    return this.instance;
  }

  /**
   * Get the singleton instance of the context.
   * @returns {Context}
   */
  static getInstance() {
    return this.instance;
  }

  /**
   * Get Model from State
   * @param {object} state
   */
  getModelFromState(state) {
    return find(this.database.entities, {
      name: state.$name
    }).model;
  }
}