method

count

v5.0.0.1 - Show latest stable - Class: ActiveRecord::Associations::CollectionAssociation

count(column_name = nil)

public

Count all records using SQL. Construct options and pass them with scope to the target class’s count.

# File activerecord/lib/active_record/associations/collection_association.rb, line 251
      def count(column_name = nil)
        relation = scope
        if association_scope.distinct_value
          # This is needed because 'SELECT count(DISTINCT *)..' is not valid SQL.
          column_name ||= reflection.klass.primary_key
          relation = relation.distinct
        end

        value = relation.count(column_name)

        limit  = options[:limit]
        offset = options[:offset]

        if limit || offset
          [ [value - offset.to_i, 0].max, limit.to_i ].min
        else
          value
        end
      end

count

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