Question

I am using Ruby on Rails 3.2.2 and I am experimenting the Squeel gem. I would like to know if (in some way, by using the Squeel gem or not) it is possible to “add” SQL clauses related to a scope method “directly” in a where clause. That is, I have:

class Article < ActiveRecord::Base
  # Note: This is a scope method.
  def self.created_by(user)
    where(:user_id => user.id)
  end

  # I would like to use a scope method like the following.
  #
  # Note: Code in the following method doesn't work, but it should help
  # understanding what I mean.
  def self.scope_method_name(user)
    where{ created_by(user) | ... & ... }
  end
end

So, when I run Article.scope_method_name(@current_user).to_sql then it should return something like the following:

SELECT articles.* FROM articles WHERE articles.user_id = 1 OR ... AND ...

I tryed sifters but those (at least for me) are intended to be used exclusively in other Squeel statements. That is, if I state a sifter then I cannot use that to scope ActiveRecords because that sifter returns a Squeel::Nodes::Predicate object instead of an ActiveRecord::Relation.

Answer 1

You have to drop down into more raw AREL for OR operations

def self.scope_method_name(user)
  t = arel_table
  where(
    (t[:user_id].eq(user.id).or(
    t[:blah].eq('otherthing')
      ).and([:bleh].eq('thirdthing'))
    )
end

Or something along those lines.