add filter for users on quiz moderation

closes CNVS-3080

test plan:
- Course with at least two students and a quiz
- Go to moderation page
- input somthing into the filter
- ensure that filters correctly

Change-Id: Ia893d7b26c63e3596e9a1d42c33a75972574d467
Reviewed-on: https://gerrit.instructure.com/85870
Tested-by: Jenkins
Reviewed-by: Ryan Taylor <rtaylor@instructure.com>
QA-Review: Robin Kuss <rkuss@instructure.com>
Product-Review: Jason Sparks <jsparks@instructure.com>

Author: Chris Wang

app/controllers/quizzes/quizzes_controller.rb

@@ -644,7 +644,9 @@ def history
 
   def moderate
     if authorized_action(@quiz, @current_user, :grade)
-      @students = @context.students_visible_to(@current_user, include: :inactive).uniq.order_by_sortable_name
+      @students = @context.students_visible_to(@current_user, include: :inactive)
+      @students = @students.name_like(params[:search_term]) if params[:search_term].present?
+      @students = @students.uniq.order_by_sortable_name
       @students = @students.order(:uuid) if @quiz.survey? && @quiz.anonymous_submissions
       last_updated_at = Time.parse(params[:last_updated_at]) rescue nil
       respond_to do |format|

app/views/quizzes/quizzes/moderate.html.erb

@@ -12,6 +12,15 @@
 <div class="moderate_header">
   <h1><%= t(:page_title, "Moderate Quiz") %></h1>
 </div>
+<%= form_tag(context_url(@context, :context_quiz_moderate_url, @quiz.id), method: :get) do %>
+  <div class="ic-Form-control">
+    <div class="ic-Input-group">
+      <%= text_field_tag :search_term, params[:search_term], class: "ic-Input", placeholder: t('Search People'),
+      aria_label: t('Search people. As you type in this field, the list of people will be automatically filtered to only include those whose names match your input.') %>
+      <%= submit_tag t('Filter'), class: "Button" %>
+    </div>
+  </div>
+<% end %>
 <table id="students" class="table table-striped <%= 'can_add_attempts' if @quiz.allowed_attempts < 0 %>">
   <thead>
     <tr>

spec/controllers/quizzes/quizzes_controller_spec.rb

@@ -485,6 +485,29 @@ def logged_out_survey_with_submission(user, questions, &block)
       assert_unauthorized
     end
 
+    context 'student_filters' do
+      before do
+        user_session(@teacher)
+        5.times.map do |i|
+          name = "#{(i + 'a'.ord).chr}_student"
+          course_with_student(name: name, course: @course)
+          @student
+        end
+      end
+
+      it "should sort students" do
+        get 'moderate', :course_id => @course.id, :quiz_id => @quiz.id
+        expect(assigns[:students] - assigns[:students].sort_by(&:sortable_name)).to eq []
+      end
+
+      it "should filter students" do
+        get 'moderate', :course_id => @course.id, :quiz_id => @quiz.id, :search_term => 'a'
+
+        expect(assigns[:students].count).to eq 1
+        expect(assigns[:students].first.sortable_name).to eq 'a_student'
+      end
+    end
+
     it "should assign variables" do
       user_session(@teacher)
       sub = @quiz.generate_submission(@student)

spec/views/quizzes/quizzes/moderate.html.erb_spec.rb

@@ -0,0 +1,48 @@
+#
+# Copyright (C) 2011 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 File.expand_path(File.dirname(__FILE__) + '/../../../spec_helper')
+require File.expand_path(File.dirname(__FILE__) + '/../../views_helper')
+
+describe "/quizzes/quizzes/moderate" do
+  let(:num_students) { 5 }
+
+  before do
+    course_with_teacher
+    @students = num_students.times.map do |i|
+      name = "#{(i + 'a'.ord).chr}_student"
+      course_with_student(name: name, course: @course)
+      @student
+    end
+    course_quiz
+    view_context
+    assigns[:students] = @students.paginate
+    assigns[:quiz] = @quiz
+    assigns[:submissions] = []
+  end
+
+  it "should render" do
+    render "quizzes/quizzes/moderate"
+    expect(response).not_to be_nil
+  end
+
+  it "should have filter options" do
+    render "quizzes/quizzes/moderate"
+    expect(response.inspect).to include 'Search people. As you type in this field, the list of people will be automatically filtered to only include those whose names match your input.'
+  end
+end