diff options
| -rw-r--r-- | activerecord/CHANGELOG.md | 17 | ||||
| -rw-r--r-- | activerecord/lib/active_record/validations/uniqueness.rb | 3 | ||||
| -rw-r--r-- | activerecord/test/cases/validations/uniqueness_validation_test.rb | 42 |
3 files changed, 49 insertions, 13 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md index 9a710263d7..16ce131cf4 100644 --- a/activerecord/CHANGELOG.md +++ b/activerecord/CHANGELOG.md @@ -1,3 +1,20 @@ +* SQLite: Fix uniqueness validation when values exceed the column limit. + + SQLite doesn't impose length restrictions on strings, BLOBs, or numeric + values. It treats them as helpful metadata. When we truncate strings + before checking uniqueness, we'd miss values that exceed the column limit. + + Other databases enforce length limits. A large value will pass uniqueness + validation since the column limit guarantees no value that long exists. + When we insert the row, it'll raise `ActiveRecord::ValueTooLong` as we + expect. + + This fixes edge-case incorrect validation failures for values that exceed + the column limit but are identical to an existing value *when truncated*. + Now these will pass validation and raise an exception. + + *Ryuta Kamizono* + * Raise `ActiveRecord::ValueTooLong` when column limits are exceeded. Supported by MySQL and PostgreSQL adapters. diff --git a/activerecord/lib/active_record/validations/uniqueness.rb b/activerecord/lib/active_record/validations/uniqueness.rb index 4a80cda0b8..1f59276137 100644 --- a/activerecord/lib/active_record/validations/uniqueness.rb +++ b/activerecord/lib/active_record/validations/uniqueness.rb @@ -67,9 +67,6 @@ module ActiveRecord cast_type = klass.type_for_attribute(attribute_name) value = cast_type.serialize(value) value = klass.connection.type_cast(value) - if value.is_a?(String) && column.limit - value = value.to_s[0, column.limit] - end comparison = if !options[:case_sensitive] && !value.nil? # will use SQL LOWER function before comparison, unless it detects a case insensitive collation diff --git a/activerecord/test/cases/validations/uniqueness_validation_test.rb b/activerecord/test/cases/validations/uniqueness_validation_test.rb index 4c14d93c66..4b0a590adb 100644 --- a/activerecord/test/cases/validations/uniqueness_validation_test.rb +++ b/activerecord/test/cases/validations/uniqueness_validation_test.rb @@ -349,19 +349,41 @@ class UniquenessValidationTest < ActiveRecord::TestCase end def test_validate_uniqueness_with_limit - # Event.title is limited to 5 characters - e1 = Event.create(:title => "abcde") - assert e1.valid?, "Could not create an event with a unique, 5 character title" - e2 = Event.create(:title => "abcdefgh") - assert !e2.valid?, "Created an event whose title, with limit taken into account, is not unique" + if current_adapter?(:SQLite3Adapter) + # Event.title has limit 5, but SQLite doesn't truncate. + e1 = Event.create(title: "abcdefgh") + assert e1.valid?, "Could not create an event with a unique 8 characters title" + + e2 = Event.create(title: "abcdefgh") + assert_not e2.valid?, "Created an event whose title is not unique" + elsif current_adapter?(:Mysql2Adapter, :PostgreSQLAdapter, :SQLServerAdapter) + assert_raise(ActiveRecord::ValueTooLong) do + Event.create(title: "abcdefgh") + end + else + assert_raise(ActiveRecord::StatementInvalid) do + Event.create(title: "abcdefgh") + end + end end def test_validate_uniqueness_with_limit_and_utf8 - # Event.title is limited to 5 characters - e1 = Event.create(:title => "一二三四五") - assert e1.valid?, "Could not create an event with a unique, 5 character title" - e2 = Event.create(:title => "一二三四五六七八") - assert !e2.valid?, "Created an event whose title, with limit taken into account, is not unique" + if current_adapter?(:SQLite3Adapter) + # Event.title has limit 5, but does SQLite doesn't truncate. + e1 = Event.create(title: "一二三四五六七八") + assert e1.valid?, "Could not create an event with a unique 8 characters title" + + e2 = Event.create(title: "一二三四五六七八") + assert_not e2.valid?, "Created an event whose title is not unique" + elsif current_adapter?(:Mysql2Adapter, :PostgreSQLAdapter, :SQLServerAdapter) + assert_raise(ActiveRecord::ValueTooLong) do + Event.create(title: "一二三四五六七八") + end + else + assert_raise(ActiveRecord::StatementInvalid) do + Event.create(title: "一二三四五六七八") + end + end end def test_validate_straight_inheritance_uniqueness |