CODEWITHSUNDEEP
breeze
TheMook
TheMook

Reputation: 1541

Breeze entity manager "hasChanges" property - how do I find out what is triggering the "true" state?

I have the following event handler in my datacontext:

    manager.hasChangesChanged.subscribe(function (eventArgs) {
        hasChanges(eventArgs.hasChanges);
    });

and in Chrome I've set a break point on the "haschanges(eventArg.haschanges);" line.

The moment I load my app and the process of fetching data begins, this breakpoint is hit. It then proceeds to be repeatedly hit and the "hasChanges" property varies between "true" and "false" many times.

I know from further debug breakpoints that a simple query that "expands" a related table via its navigation property triggers a visit to my "hasChangesChanged" event handler.

What I don't know - as the "eventArgs" is so big and complex - is exactly which of my 5 or so related entities being retrieved is triggering the "true" on the "hasChanges" property. Is there a property within the eventArgs I can inspect to determine which current entity has caused the trip to the hasChangesChanged event handler?

I'm puzzled about why any of what I'm doing is setting "hasChanges" to true as all I do in the first instance is retrieve data. As far as I'm aware, nothing is changed whatsoever at the point the entity manager is convinced that something has changed.

To elaborate, my app prefetches lots of data used for a tree structure at the point where it is sitting waiting for first input from the user. As the user has not had an opportunity of touching anything in the app by this point, why would breeze think that any of the entities concerned have been changed when they've simply been read in from the database?

Upvotes: 1

Views: 1565

Answers (1)

Jay Traband
Jay Traband

Reputation: 17052

Use the EntityManager.entityChanged event if you want fine grained information about what has changed. This event gives much more detail but is fired much more often.

http://www.breezejs.com/sites/all/apidocs/classes/EntityManager.html

Upvotes: 1

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