From 24a11c957a34d2f22c0276fa8dcc3e2c23d1f164 Mon Sep 17 00:00:00 2001
From: Andreas Brandl <abrandl@gitlab.com>
Date: Sun, 4 Feb 2018 20:46:14 +0100
Subject: Set todos#author_id to NOT NULL.

---
 app/models/todo.rb                                 |  1 +
 .../unreleased/32282-add-foreign-keys-to-todos.yml |  2 +-
 ...200836_change_author_id_to_not_null_in_todos.rb | 26 ++++++++++++++++++++++
 db/schema.rb                                       |  4 ++--
 spec/models/todo_spec.rb                           |  1 +
 5 files changed, 31 insertions(+), 3 deletions(-)
 create mode 100644 db/post_migrate/20180204200836_change_author_id_to_not_null_in_todos.rb

diff --git a/app/models/todo.rb b/app/models/todo.rb
index 7af54b2beb2..bb5965e20eb 100644
--- a/app/models/todo.rb
+++ b/app/models/todo.rb
@@ -28,6 +28,7 @@ class Todo < ActiveRecord::Base
   delegate :name, :email, to: :author, prefix: true, allow_nil: true
 
   validates :action, :project, :target_type, :user, presence: true
+  validates :author, presence: true
   validates :target_id, presence: true, unless: :for_commit?
   validates :commit_id, presence: true, if: :for_commit?
 
diff --git a/changelogs/unreleased/32282-add-foreign-keys-to-todos.yml b/changelogs/unreleased/32282-add-foreign-keys-to-todos.yml
index 5b551e260d3..e74c2a8b9ff 100644
--- a/changelogs/unreleased/32282-add-foreign-keys-to-todos.yml
+++ b/changelogs/unreleased/32282-add-foreign-keys-to-todos.yml
@@ -1,5 +1,5 @@
 ---
-title: Add foreign key constraints to todos table.
+title: Add foreign key and NOT NULL constraints to todos table.
 merge_request: 16849
 author:
 type: other
diff --git a/db/post_migrate/20180204200836_change_author_id_to_not_null_in_todos.rb b/db/post_migrate/20180204200836_change_author_id_to_not_null_in_todos.rb
new file mode 100644
index 00000000000..92c32feebf7
--- /dev/null
+++ b/db/post_migrate/20180204200836_change_author_id_to_not_null_in_todos.rb
@@ -0,0 +1,26 @@
+class ChangeAuthorIdToNotNullInTodos < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  class Todo < ActiveRecord::Base
+    self.table_name = 'todos'
+    include EachBatch
+  end
+
+  BATCH_SIZE = 1000
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    Todo.where(author_id: nil).each_batch(of: BATCH_SIZE) do |batch|
+      batch.delete_all
+    end
+
+    change_column_null :todos, :author_id, false
+  end
+
+  def down
+    change_column_null :todos, :author_id, true
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index dd8d14fb401..c56cb461320 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20180202111106) do
+ActiveRecord::Schema.define(version: 20180204200836) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -1707,7 +1707,7 @@ ActiveRecord::Schema.define(version: 20180202111106) do
     t.integer "project_id", null: false
     t.integer "target_id"
     t.string "target_type", null: false
-    t.integer "author_id"
+    t.integer "author_id", null: false
     t.integer "action", null: false
     t.string "state", null: false
     t.datetime "created_at"
diff --git a/spec/models/todo_spec.rb b/spec/models/todo_spec.rb
index 3e8f3848eca..bd498269798 100644
--- a/spec/models/todo_spec.rb
+++ b/spec/models/todo_spec.rb
@@ -20,6 +20,7 @@ describe Todo do
     it { is_expected.to validate_presence_of(:action) }
     it { is_expected.to validate_presence_of(:target_type) }
     it { is_expected.to validate_presence_of(:user) }
+    it { is_expected.to validate_presence_of(:author) }
 
     context 'for commits' do
       subject { described_class.new(target_type: 'Commit') }
-- 
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