Ember Recursive Model Rollback

recursive-rollback.coffee

# Ember data does not dirty the parent model if any of it's children change so
# no rollback can occur for a child.  This fixes this by resetting a child's
# data to the internal data tracked by the parent model.
DS.Model.reopen
  rollbackBelongsTo: (relationshipName) ->
    thisName = @constructor.typeKey
    relationshipInstance = @get relationshipName
    # Rollback any attributes that were changed in the relationship
    relationshipInstance.rollback()

    # Recursively follow the relationships and roll them back too.
    relationshipInstance.constructor.eachRelationship (name, childRelationship) ->
      unless name is thisName
        childRelationshipInstance = relationshipInstance.get name
        if childRelationshipInstance and childRelationship.kind is 'belongsTo'
            relationshipInstance.rollbackBelongsTo name

    # Rollback the relationship instance back to the previous set one
    @set relationshipName, @_data[relationshipName]