diff options
| -rw-r--r-- | activerecord/CHANGELOG.md | 5 | ||||
| -rw-r--r-- | activerecord/lib/active_record/relation/calculations.rb | 2 | ||||
| -rw-r--r-- | activerecord/test/cases/calculations_test.rb | 4 |
3 files changed, 10 insertions, 1 deletions
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 @@ module ActiveRecord 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 @@ class CalculationsTest < ActiveRecord::TestCase 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), |