Override of Ext.data.Model

[remeis]

Hi community,

I'm using Ext 4.0.7 and want to dynamically add columns to a grid view. Therefore, I also have to modify the connected store and model definitions. While fighting with the code I thougth it might work if I simply override the existing model and add some new fields.

Consider the following model:

Ext.define('myModel', {
  extend: 'Ext.data.Model',
  fields: [
    { name: 'title', type: 'string', defaultValue: '' }
  ]
});

Now let's override the model:

Ext.override(myModel, {
  fields: [
    { name: 'title', type: 'string', defaultValue: '' },
    { name: 'subtitle', type: 'string', defaultValue: '' }
  ]
});

This did work, but if I then want to create a new model instance by
Ext.create('myModel');
I get the following error:

fields is undefined
[Break On This Error]
length = fields.length;


However, I solved that issue by redefining the model and extending from itself:

Ext.define('myModel', {
  extend: 'myModel',
  fields: [
    { name: 'title', type: 'string', defaultValue: '' },
    { name: 'subtitle', type: 'string', defaultValue: '' }
  ]
});

Can someone please tell me, why the override did not work or where I did a mistake?

[mitchellsimoens]

The fields are used in the onClassExtended method of Ext.data.Model so they are only used when they are extended.