Add(extend) properties to all Change models.

[BerkeleyTrue]

I would like to add some properties to the change model. I was able to successfully extend the Change model that is attached at app.loopback.Change using a script in the Boot dir, but these changes are not added to the individual change models attached models at Model.getChangeModel();

Is it possible to extend all these models at once, or do I have to go through each model individually and grab their respective change models?

Is it possible to hook into the an earlier stage of app bootup outside of the boot script before the change model is attached?

[bajtos]

@BerkeleyTrue could you please provide more details on what you are trying to accomplish? What kind of properties are you adding to the Change model, what do you use these new properties for.

If we don't find a different solution, then we should implement some kind of a hook as you are suggesting.

BTW it is possible that modifying the Change model in a boot script is too late, because Model.getChangeModel() was already called for all models with change tracking enabled. Please try to move your code modifying the Change object to the main app file (server/server.js) and run it before boot(app) is called.

[BerkeleyTrue]

In order to deal with conflicts, we are extending the Change model to include a property role and prevRole. The properties need to be added at different points in the replication algorithm. This involves overwriting Change.rectify, Change.rectifyAll and so on.

These roles are used to resolve conflicts.

[bajtos]

Thank you for the details.

Have you tried to extend the Change model before boot(app) is called? Did it solve the problem?

[BerkeleyTrue]

Just ran a test and it is working. A much cleaner solution. Thanks @bajtos. For those interested...

// server/server.js
var extendChange = require('../common/boot/extendChange');
/*...*/
extendChange(app);

boot(app, options);

//client/client.js

var loopback = require('loopback'),
    extendChange = require('../../common/boot/extendChange'),
    boot = require('loopback-boot');

var app = module.exports = loopback();

// ## Extend Change before boot
extendChange(app);
boot(app);