Question

I’m trying to set all the values to 0 but the 3rd line (send(x)) is giving me problems. Seems right to me, but doesn’t work. x is the car and name of the columns in Power. Any tips?

<% @cars.each do |x| %>
  <% @power = Power.find_by_user_id(@user) %>
  <% @power.send(x) = 0 %>
  <% @power.save %>
<% end %>

Answer 1

Assuming @cars contains column names of Power, you need to send the setter method (i.e. with an = at the end). You also need to ensure you’re passing a symbol to send.

@cars.each do |x|
  @power = Power.find_by_user_id(@user)
  @power.send(:"#{x}=", 0)
  @power.save
end

There’s also not an obvious reason why you need to set or save @power in the loop, so it might be better as:

@power = Power.find_by_user_id(@user)
@cars.each do |x|
  @power.send(:"#{x}=", 0)
end
@power.save