Question

I am checking to see if a value in a related table exists quite often in my view, in this case, expenses have approvals. If they have not been submitted, then there is no record of them in the approvals table.

I am ending up with some really awkward code

<% if !expense_item.expense_approval || expense_item.expense_approval.approval_status == 0 %>

Is there a way to do an if statement on a value, without having to check if it exists first? Or some default way to set it nil?

Answer 1

You could do the following in your ExpenseItem model:

delegate :approval_status, :to => :expense_approval, :allow_nil => true

This should allow you to simply do the following:

if expense_item.approval_status == 0

The try method above certainly works, but I like delegation better because I don’t have to have .try(...) all over my code.