Question

I need to combine name scope with or operator…
Something like:

class Product < ActiveRecord::Base
  belongs_to :client

  scope :name_a, where("products.name = 'a'")
  scope :client_b, joins(:client).where("clients.name = 'b'")

  scope :name_a_or_b, name_a.or(client_b)  
end

Thx

Answer 1

From Arel documentation

The OR operator is not yet supported. It will work like this:
users.where(users[:name].eq('bob').or(users[:age].lt(25)))

This RailsCast shows you how to use the .or operator. However, it works with Arel objects while you have instances of ActiveRecord::Relation.
You can convert a relation to Arel using Product.name_a.arel, but now you have to figure out how to merge the conditions.