These days I have been comparing records in my daily job lots of times,
which made me think about a better way to retrieve and compare them. When I
want to navigate through several relations in a collection I often see
myself writing code like the following:
Given orders as a collection of Order:
> orders.map(&:order_option).map(&:item).map(&:title)
=> ['Foo', 'Bar', 'Baz']
That is, chaining maps with Symbol to Proc coercions one after each other.
Sharing my thoughts with my company's architect we came up with the
alternative:
> orders.map { |order| order&.order_option&.item&.title }
But we agreed that the notation was awful and didn't improve what we had
before. With this, I proposed what I think it is more like what we would
expect Ruby to have. I would like to add a notation similar to the one we
can find at Array#dig
<https://ruby-doc.org/core-2.5.0/Array.html#method-i-dig> or Hash#dig
<https://ruby-doc.org/core-2.5.0/Hash.html#method-i-dig> in the following
manner:
> orders.map(&:order_option, &:item, &:title)
The method doesn't necessarily need to be named map or collect, we can
agree on a different name for it if you want. Please share your thoughts
with me. If you like this, I would be very happy to write a PR to include
it in Rails.
Cheers,
Alberto Almagro
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