Using ActiveRecord::Relation.where_values_hash

where_values_hash.rb

# Problem: I need to add some model's default scope to an ARel query

# I don't know if everyone else already knew this, or if there's a
# a cleaner way; but this has been working well for me:
class OtherModel < ActiveRecord::Base
  # ...
  default_scope where(:deleted_at => nil)
  # ...
end

original_query = SomeModel.where(...)
new_query = original_query.where(OtherModel.table_name => OtherModel.scoped.where_values_hash)

Oh. I don't think so. I'd meant that in order to have a where() call refer to another table, you have to joins() it in, right? Or belongs_to and it's cousins in the relevant models?

Every time I have used default_scope I've ended up regretting it.

I thought consensus was not to use it.
In my experience it's always more hassle to work around default_scope's subtle implications than to just use an explicit scope in the places where you access the Model.