count_by_sql

Returns the result of an SQL statement that should only include a COUNT(*) in the SELECT part. The use of this method should be restricted to complicated SQL queries that can't be executed using the ActiveRecord::Calculations class methods. Look into those before using this.

Parameters

• sql - An SQL statement which should return a count query from the database, see the example below.

  Product.count_by_sql âSELECT COUNT(*) FROM sales s, customers c WHERE s.customer_id = c.idâ