Best practice: getter/setter pattern

[bidwej]

Hi there,

RawModel is fantastic. How would you suggest creating getter/setter functions that need to reference other field values?

For example

public isSurveyComplete: boolean;
public eventDate: Date;
...
this.defineField('isSurveyComplete', {'Boolean'});
this.defineField('eventDate', {
      type: 'Date',
      get(value) {
              if(this.isSurveyComplete) {
                   return value;
              }
              else {
                   return null;
              }
      },
    });

I've read through your documentation and source code. It looks like the 'field' values are 'protected' and therefore not accessible (makes sense).

My work around is to do something like the following:
`
....
this.populate(data);

// append getter/setters after values are populated
Object.defineProperty(this, 'eventDate', {
  get: function () {
    if (this.isSurveyComplete) {
      return this.eventDate;
    }
  }
});

`
Is there a better way? I'd like to maintain the 'validate' functionality that you've provided.

Thank you!

[xpepermint]

Hey @bidwej. I'm glad you like it.

Each field can access model's context through the this.owner field. The owner is a model that owns the field and thus represents a link between a Model and a Field. In your case you would do something like this:

this.defineField('eventDate', {
  type: 'Date',
  get(v) {
     return this.owner.isSurveyComplete ? v : null;
  },
});

Using Object.defineProperty is not advised. Note that you can access all instance methods of the Field through this (e.g. this.hasErrors()).