autoform-formdata.js

import { Tracker } from 'meteor/tracker'
/*
 * Tracks form data with reactivity. This is similar to
 * ReactiveDict, but we need to store typed objects and
 * keep their type upon retrieval.
 */

export class FormData {
  constructor () {
    const self = this
    self.forms = {}
  }

  /**
   * Initializes tracking for a given form, if not already done.
   * @param {String} formId The form's `id` attribute
   */
  initForm (formId) {
    const self = this

    if (self.forms[formId]) {
      return
    }

    self.forms[formId] = {
      sourceDoc: null,
      deps: {
        sourceDoc: new Tracker.Dependency()
      }
    }
  }

  /**
   * Gets or sets a source doc for the given form. Reactive.
   * @param   {String}                formId    The form's `id` attribute
   * @param   {MongoObject|null}      sourceDoc The mDoc for the form or `null` if no doc.
   * @returns {MongoObject|undefined} Returns the form's MongoObject if getting.
   */
  sourceDoc (formId, sourceDoc) {
    const self = this
    self.initForm(formId)

    if (sourceDoc || sourceDoc === null) {
      // setter
      self.forms[formId].sourceDoc = sourceDoc
      self.forms[formId].deps.sourceDoc.changed()
    }
    else {
      // getter
      self.forms[formId].deps.sourceDoc.depend()
      return self.forms[formId].sourceDoc
    }
  }
}