How to map JSON coming from Mongoose to Vue and Quasar?
If I understand correctly, donvis is the data from mongoose, which is an object.Objects don't have a length property
You should try this:
donvis.kinder.forEach(child => { treeNodes.push({ fachlicherTyp: child.fachlicherTyp, _id: child._id, lazy: true, parent_id: parent_id, })})I'm using forEach because I think it makes things more readable. Tell me if you don't know how to use it.
Notice that I'm also using treeNodes.push(...) instead of treeNodes[i] = ... This is a more standard way of filling up an array