to_sql()
Returns sql statement for the relation.
User.where(name: 'Oscar').to_sql # => SELECT "users".* FROM "users" WHERE "users"."name" = 'Oscar'
# File activerecord/lib/active_record/relation.rb, line 492 def to_sql @to_sql ||= klass.connection.to_sql(arel, bind_values.dup) end