Store depth in the model

[kanle485]

I think it would be better to store each node's level as a field in the model, so that we can generate the json representation of the tree easier and more efficiently. In large trees, it's not feasible to get level of each node. That's too many db calls.

[smebberson]

I agree. Would a PR help see this make its way into the source?

[timoxley]

@smebberson prs always help

[dzcpy]

+1

[shahadat-dev]

It's a good idea. We are facing same problem here. This issue was created about 3.5 years ago. But no response yet :(

[atoumbre]

Hello
See PR : #19