Flowdock
method

count_by_sql

Importance_1
count_by_sql(sql) public

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.

Product.count_by_sql "SELECT COUNT(*) FROM sales s, customers c WHERE s.customer_id = c.id"
# => 12

Parameters

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

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