Question

I have the table “tools” and “lend”.

Im using Rails3 and when i create a lend i would like it change the attribute status of the tool to ‘U’.

Would this is possible?

i tried on the model lend

 after_save :change_status

  def change_status
      tools.update_attribute(status, 'U')
  end

i tried too, on the same model:

 after_save :change_status

  def change_status
      self.tool.update_attribute(status, 'U')
  end

No success or warning on debug log.

Sugestions?

Thanks! 🙂

Answer 1

What is the relationship between lend and tool? If Lend has_many tools, you will have to do something like this:

def change_status
  tools.each { |tool| tool.update_attributes(status: 'U') }
end

Note also that I am using update_attributes because update_attribute (singular) will be deprecated soon.

BTW, you should create a method in Tool to update the attribute, the Lend model should not be aware about how to set a tool as loaned. Something like

def loaned!
  update_attributes status: 'U'
end