ViewModel Stores, Formulas: Is it possible bind record of Store by Model-Id?

[bvassilis]

Is it possible bind record of Store by Model-Id instead of referring to the index?
The example below works if bind specific index:env:'{environments.data.items.2}'

However, is it possible using Model-Id, as it makes the code maintainable that way.
:

    Ext.define('EnvironmentStore', {
        extend: 'Ext.data.Store',
        storeId: 'environmentStore',
        alias: 'store.environment',
        model: 'EnvironmentModel',
        proxy: {
            type: 'ajax',
            url: 'environment',
            method: 'GET',
            reader: {
                type: 'json',
                rootProperty: 'root'
            }
        }
    });

    Ext.define('EnvironmentModel', {
        extend: 'Ext.data.Model',
        idProperty: 'variableName',
        fields: [
            { name: 'variableName', type: 'string' },
            { name: 'variableValue', type: 'string' }
        ]
    });



    Ext.define('EnvironmentVM', {
        extend: 'Ext.app.ViewModel',
        alias: 'viewmodel.environment',

        stores: {
            environments: {
                type: 'environment',
                autoLoad: true,
                session: true
            }
        },

        formulas: {
            env: {
                bind: {
                    env: '{environments.data['UAT']}',
                    deep: true
                },
                get: function (link) {
                    if(!link.env) {
                        return null;
                    } else { returnlink.env }


                }
            }
        }

    });

[evant]

Something like this:

https://fiddle.sencha.com/#view/editor&fiddle/2igi

[bvassilis]

This approach binds all the store into formula and with deep true which looks heavy.
I was wondering if there was a way using bind descriptor {} to target only one record by Id and with deep true?

[evant]

It's not heavy, it executes a look by id (constant time) when the data in the store changes, or the id changes.

[mitchellsimoens]

The id lookup (via getById) is also a simple object key lookup, it doesn't loop thru all the records to find an id which could then be considered "heavy".