diff options
Diffstat (limited to 'activerecord/lib/active_record/relation')
| -rw-r--r-- | activerecord/lib/active_record/relation/calculations.rb | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/activerecord/lib/active_record/relation/calculations.rb b/activerecord/lib/active_record/relation/calculations.rb index c105abe774..a4714f138a 100644 --- a/activerecord/lib/active_record/relation/calculations.rb +++ b/activerecord/lib/active_record/relation/calculations.rb @@ -131,7 +131,7 @@ module ActiveRecord def calculate(operation, column_name) if has_include?(column_name) relation = construct_relation_for_association_calculations - relation = relation.distinct if operation.to_s.downcase == "count" + relation.distinct! if operation.to_s.downcase == "count" relation.calculate(operation, column_name) else @@ -214,8 +214,13 @@ module ActiveRecord if operation == "count" column_name ||= select_for_count - column_name = primary_key if column_name == :all && distinct - distinct = nil if column_name =~ /\s*DISTINCT[\s(]+/i + if column_name == :all + if distinct && !(has_limit_or_offset? && order_values.any?) + column_name = primary_key + end + elsif column_name =~ /\s*DISTINCT[\s(]+/i + distinct = nil + end end if group_values.any? @@ -242,7 +247,7 @@ module ActiveRecord def execute_simple_calculation(operation, column_name, distinct) #:nodoc: column_alias = column_name - if operation == "count" && (limit_value || offset_value) + if operation == "count" && has_limit_or_offset? # Shortcut when limit is zero. return 0 if limit_value == 0 @@ -381,14 +386,18 @@ module ActiveRecord end def build_count_subquery(relation, column_name, distinct) - column_alias = Arel.sql("count_column") - subquery_alias = Arel.sql("subquery_for_count") + relation.select_values = [ + if column_name == :all + distinct ? Arel.star : Arel.sql("1") + else + column_alias = Arel.sql("count_column") + aggregate_column(column_name).as(column_alias) + end + ] - aliased_column = aggregate_column(column_name == :all ? 1 : column_name).as(column_alias) - relation.select_values = [aliased_column] - subquery = relation.arel.as(subquery_alias) + subquery = relation.arel.as(Arel.sql("subquery_for_count")) + select_value = operation_over_aggregate_column(column_alias || Arel.star, "count", false) - select_value = operation_over_aggregate_column(column_alias, "count", distinct) Arel::SelectManager.new(subquery).project(select_value) end end |