Module: PolymorphicJoin::ClassMethods

Defined in:
lib/polymorphic_join.rb

Instance Method Summary collapse

Instance Method Details

#polymorphic_union_scope(types, *scopes) ⇒ Object 



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# File 'lib/polymorphic_join.rb', line 13

def polymorphic_union_scope(types, *scopes)
  union = scopes[0]
  t2 = arel_table

  if scopes.length > 1
    (1..(scopes.length - 1)).each do |i|
      union = union.union(scopes[i])
    end
  end

  t1 = arel_table.create_table_alias(union, types)
  from(t2.create_join(t1, t2.create_on(t1[:id].eq(t2[:id]))))
end