method

columns_for_distinct

v4.2.1 - Show latest stable - Class: ActiveRecord::ConnectionAdapters::SchemaStatements

columns_for_distinct(columns, orders)

public

Given a set of columns and an ORDER BY clause, returns the columns for a SELECT DISTINCT. Both PostgreSQL and Oracle overrides this for custom DISTINCT syntax - they require the order columns appear in the SELECT.

columns_for_distinct("posts.id", ["posts.created_at desc"])

# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 866
      def columns_for_distinct(columns, orders) #:nodoc:
        columns
      end

columns_for_distinct

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