Add observer alert thresholds and alerts migrations/models

Refs MBL-10121

Test Plan:
 - in the rails console you should be able to
   create an ObserverAlertThreshold that is linked
   to a user_observation_link
 - in the rails console you should be able to
   create an ObserverAlert that is linked to a
   user_observation_link and observer_alert_threshold

Change-Id: I7f907decf310a011d968b2d937953b91ccd5f7f0
Reviewed-on: https://gerrit.instructure.com/149067
Tested-by: Jenkins
Reviewed-by: Cameron Sutter <csutter@instructure.com>
Product-Review: Cameron Sutter <csutter@instructure.com>
QA-Review: Cameron Sutter <csutter@instructure.com>

app/models/observer_alert.rb

@@ -0,0 +1,22 @@
+#
+# Copyright (C) 2018 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+
+class ObserverAlert < ActiveRecord::Base
+  belongs_to :user_observation_link, :inverse_of => :observer_alert
+  belongs_to :observer_alert_threshold
+  belongs_to :context, polymorphic: [:announcement, :assignment, :course, :account_notification]
+end

app/models/observer_alert_threshold.rb

@@ -0,0 +1,20 @@
+#
+# Copyright (C) 2018 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+
+class ObserverAlertThreshold < ActiveRecord::Base
+  belongs_to :user_observation_link, :inverse_of => :observer_alert_threshold
+end

app/models/user_observation_link.rb

@@ -27,6 +27,9 @@ class UserObservationLink < ActiveRecord::Base
   belongs_to :observer, :class_name => 'User', inverse_of: :as_observer_observation_links
   belongs_to :root_account, :class_name => 'Account'
 
+  has_many :observer_alert_threshold, :inverse_of => :user_observation_link
+  has_many :observer_alert, :inverse_of => :user_observation_link
+
   after_create :create_linked_enrollments
 
   validate :not_same_user, :if => lambda { |uo| uo.changed? }

db/migrate/20180502184537_create_observer_alert_thresholds.rb

@@ -0,0 +1,30 @@
+#
+# Copyright (C) 2018 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+
+class CreateObserverAlertThresholds < ActiveRecord::Migration[5.1]
+  tag :predeploy
+  def change
+    create_table :observer_alert_thresholds do |t|
+      t.belongs_to :user_observation_link, :null => false, :foreign_key => { to_table: 'user_observers'}
+      t.string :alert_type, :null => false
+      t.string :threshold
+      t.string :workflow_state, :default => 'active', :null => false, :index => true
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20180503142113_create_observer_alerts.rb

@@ -0,0 +1,36 @@
+#
+# Copyright (C) 2018 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+
+class CreateObserverAlerts < ActiveRecord::Migration[5.1]
+  tag :predeploy
+  def change
+    create_table :observer_alerts do |t|
+      t.belongs_to :user_observation_link, :null => false, :foreign_key => { to_table: 'user_observers' }
+      t.belongs_to :observer_alert_threshold, :null => false, :foreign_key => true
+
+      t.belongs_to :context, :polymorphic => true
+
+      t.string :alert_type, :null => false
+      t.string :workflow_state, :default => 'unread', :null => false, :index => true
+      t.timestamp :action_date, :null => false
+      t.string :html_url
+      t.string :title, :null => false
+
+      t.timestamps
+    end
+  end
+end

spec/models/observer_alert_spec.rb

@@ -0,0 +1,42 @@
+#
+# Copyright (C) 2018 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+
+require_relative '../spec_helper'
+
+describe ObserverAlert do
+  it 'can link to a threshold and observation link' do
+    assignment = assignment_model()
+    assignment.save!
+    observer = user_factory()
+    student = user_factory()
+    link = UserObservationLink.new(:student => student, :observer => observer, 
+                            :root_account => @account)
+    link.save!
+    threshold = ObserverAlertThreshold.new(:user_observation_link => link, :alert_type => 'missing')
+    threshold.save!
+
+    alert = ObserverAlert.new(:user_observation_link => link, :observer_alert_threshold => threshold,
+                      :context => assignment, :alert_type => 'missing', :action_date => Time.zone.now,
+                      :title => 'Assignment missing')
+    alert.save!
+
+    saved_alert = ObserverAlert.find(alert.id)
+    expect(saved_alert).not_to be_nil
+    expect(saved_alert.user_observation_link).not_to be_nil
+    expect(saved_alert.observer_alert_threshold).not_to be_nil
+  end
+end

spec/models/observer_alert_threshold_spec.rb

@@ -0,0 +1,34 @@
+#
+# Copyright (C) 2018 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+
+require_relative '../spec_helper'
+
+describe ObserverAlertThreshold do
+  it 'can link to an user_observation_link' do
+    observer = user_factory()
+    student = user_factory()
+    link = UserObservationLink.new(:student => student, :observer => observer, 
+                            :root_account => @account)
+    link.save!
+    threshold = ObserverAlertThreshold.new(:user_observation_link => link, :alert_type => 'missing')
+    threshold.save!
+
+    saved_threshold = ObserverAlertThreshold.find(threshold.id)
+    expect(saved_threshold).not_to be_nil
+    expect(saved_threshold.user_observation_link).not_to be_nil
+  end
+end