Question

I was just wondering: How can I identify which parameters is being updated in a classic CRUD controller?
I would like to redirect to different path depending on which parameters is being changed.

For example, if I have a Person with 3 attributes id name and firstname

In my controller:

def update
  @person = Person.find(params[:id])

  respond_to do |format|
    if @person.update_attributes(params[:person])
      #...
    else
      #...
    end
  end
end

How can I detect that name is being changed, and not firstname

Would something like !params[:name].nil? work?

Thanks for your help!

Answer 1

so you could check the params like you said. Something like if !params.[:name].nil? ...

OR

You could use the _changed? methods

@person.attributes = params[:person]
if @person.name_changed?
  next_path = name_changed_path
else
 ...
end
@person.save
redirect_to next_path