instance method `build_count_subquery`

Ruby on Rails 5.2.8.1

Since v3.1.12 Private

Available in: v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

build_count_subquery(relation, column_name, distinct)

No documentation comment.

Parameters

relation req
column_name req
distinct req

Source

# File activerecord/lib/active_record/relation/calculations.rb, line 404
      def build_count_subquery(relation, column_name, distinct)
        if column_name == :all
          relation.select_values = [ Arel.sql(FinderMethods::ONE_AS_ONE) ] unless distinct
        else
          column_alias = Arel.sql("count_column")
          relation.select_values = [ aggregate_column(column_name).as(column_alias) ]
        end

        subquery = relation.arel.as(Arel.sql("subquery_for_count"))
        select_value = operation_over_aggregate_column(column_alias || Arel.star, "count", false)

        Arel::SelectManager.new(subquery).project(select_value)
      end

Defined in activerecord/lib/active_record/relation/calculations.rb line 404 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveRecord::Calculations

Signature

Parameters