Ruby On rails: Assign values from form to Model object but not save

Yes we can update a new Model object with values from a form saved in params without hitting to database.

# Assuming that params contains data from the form
# model_params is a private method that checks if only permitted columns
# are fetched and returns the fields as Hash

newObj = Model.find params[:id]
newObj.assign_attributes model_params

Note: update_attributes = assign_attributes + save