diff --git a/.gitignore b/.gitignore
index 5c9279d7..af28a163 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@ tmp/
 log/
 logs/
 !vendor/travis-core/lib/travis/logs/
+!vendor/travis-core/lib/travis/model/log/
 
 .yardoc
 .coverage
diff --git a/vendor/travis-core/lib/travis/model/log/part.rb b/vendor/travis-core/lib/travis/model/log/part.rb
new file mode 100644
index 00000000..dfb9ffdd
--- /dev/null
+++ b/vendor/travis-core/lib/travis/model/log/part.rb
@@ -0,0 +1,5 @@
+class Log::Part < Travis::LogsModel
+  self.table_name = 'log_parts'
+
+  validates :log_id, presence: true, numericality: { greater_than: 0 }
+end