Top-level property for any changes

[krispharper]

Apologies for opening another issue so soon. Is there a property at the change tracker level that will indicate if any changes have been made on any of the objects in the object graph? I'm hoping to use this for a "needs to be saved" indication for backing a UI.

I saw this issue, which I think would accomplish what I need, but it involves configuring a separate event on each tracked object, which is a little cumbersome.

I didn't see anything in the documentation, but maybe I'm missing something. Right now I'm basically doing something like this

entities.SelectMany(e => e.GetChangeTracker().ChangedProperties).Any();

which could be slow if there are a lot of entities or a lot of changes.

[mfidemraizer]

Hey! No problem, you may ask as many questions as you need when you find issues or you've doubts!

May you explain further details about your object graph? Is the object graph a collection? Is a change tracked collection?

If I'm not mistaken, you're looking for sharing the same object change tracker across all those entities which could drive to this other issue: https://github.com/mfidemraizer/trackerdog/issues/41

Please answer the question so I can figure out what's going on with more precision.

Thank you in advance!

[krispharper]

I am effectively looking for something similar to the HasChanges method from Entity Framework's change tracker. This gives a single place to check for any changes across all objects being tracked.

This can be nice if, for example, you have a UI backed by several different tracked objects, and you want to indicate if there are any changes that need to be saved.

I can do it manually using something like the above where I iterate over all tracked objects, call GetChangeTracker() on each one, and check ChangedProperties for any changes. But that requires keeping track of exactly which objects are being tracked and providing a common method to access them.

[mfidemraizer]

@krispharper I see, something like ChangeTracker.HasChanges.

This involves a shared change tracker across many unrelated entities. It's related to #41

It requires some effort. Let me think again about it.