Objection.js: Question: checking if attribute has been changed

[nicolaracco]

Is there a way to know what attributes have been changed?

I'm considering an API like:

const model = await Model.query().findById(id)
model.name = 'New name'
console.log(model.nameHasChanged) # => true
console.log(model.idHasChanged) # => false

or something like:

const model = await Model.query().findById(id)
model.name = 'New name'
console.log(model.name === model.persistedName) # => false

[koskimas]

There's no way to do that. There's no plausible way to implement that without extra queries and locks since the value can change at any given moment.

[koskimas]

For a crappy and dangerous implementation, you could override $parseDatabaseJson method and save the object returned by super.$parseDatabaseJson to a property like $origAttrs. Properties that start with $ are excluded from all normal processing.

[nicolaracco]

Indeed I was more interested in tracking dirty fields, like in ActiveRecord or Mongoose.