From 51d6e21c966362ed63318d216913bcef504833a4 Mon Sep 17 00:00:00 2001 From: Tim Macfarlane Date: Fri, 24 Aug 2012 10:08:36 +0100 Subject: [PATCH] ActiveRecord: sum expression returns string '0' for no records, fixed --- activerecord/CHANGELOG.md | 5 +++++ activerecord/lib/active_record/relation/calculations.rb | 2 +- activerecord/test/cases/calculations_test.rb | 4 ++++ 3 files changed, 10 insertions(+), 1 deletion(-) diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md index f3362f81a3..ae86a0b94e 100644 --- a/activerecord/CHANGELOG.md +++ b/activerecord/CHANGELOG.md @@ -906,3 +906,8 @@ *Aaron Patterson* Please check [3-2-stable](https://github.com/rails/rails/blob/3-2-stable/activerecord/CHANGELOG.md) for previous changes. + +* Fix bug where sum(expression) returns string '0' for no matching records + Fixes #7439 + + *Tim Macfarlane* diff --git a/activerecord/lib/active_record/relation/calculations.rb b/activerecord/lib/active_record/relation/calculations.rb index 7c43d844d0..6317004631 100644 --- a/activerecord/lib/active_record/relation/calculations.rb +++ b/activerecord/lib/active_record/relation/calculations.rb @@ -349,7 +349,7 @@ def column_for(field) def type_cast_calculated_value(value, column, operation = nil) case operation when 'count' then value.to_i - when 'sum' then type_cast_using_column(value || '0', column) + when 'sum' then type_cast_using_column(value || 0, column) when 'average' then value.respond_to?(:to_d) ? value.to_d : value else type_cast_using_column(value, column) end diff --git a/activerecord/test/cases/calculations_test.rb b/activerecord/test/cases/calculations_test.rb index 6cb6c469d2..de4902f89a 100644 --- a/activerecord/test/cases/calculations_test.rb +++ b/activerecord/test/cases/calculations_test.rb @@ -378,6 +378,10 @@ def test_should_sum_expression end end + def test_sum_expression_returns_zero_when_no_records_to_sum + assert_equal 0, Account.where('1 = 2').sum("2 * credit_limit") + end + def test_count_with_from_option assert_equal Company.count(:all), Company.from('companies').count(:all) assert_equal Account.where("credit_limit = 50").count(:all), -- GitLab