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This wiki page is for the description of E1951. Remove multiple topics at a time (Issue #1409).

Introduction

The Expertiza project is software to create reusable learning objects through peer review. It also supports team projects, and the submission of almost any document type, including URLs and wiki pages.

Problem Statement

Expertiza has Assignment objects, which represent an assignment that is done by some number of users. For some assignments, students need to select a topic before submitting work.

Topics associated with an assignment be reached as follows:

1. Log in as an instructor or a TA.

2. Select Manage->Assignments, which will bring up a list of assignments.

3. Click on “edit logo” under the “Action” column of an assignment.

4. Click on “Topics” tab in edit assignment page.

If an instructor or a TA wants to delete topics, he has to delete one topic at a time and has to wait for the page to refresh and then (s)he can proceed to delete the next topic, topics can only be deleted one by one.

To fix the problem:

1.There should be a checkbox column, along with other columns in “Topics” tab, where a user can select the topics (s)he wants to delete.

2.There should be a delete button/link at the end of the topic table with the name “delete selected topics” to delete the selected topics after a confirmation, prompted post clicking the button/link.

3.There should be a button/link alongside “delete selected topics” by the name “Select all” so that a user can select all and delete them in one go after clicking on “delete selected topics”.

How to manually test our function

1. Beside "Home", click "Manage...", then click "Assignments".

2. Choose an Assignment ( Final project (and design doc) is recommended).Then click "Edit" below Actions.

3. Click "Topic" tab.

4. Create some topics by click "New topic" on the bottom line.

5. Select them and click "Delete selected topics". Then click "Yes". (It may take a while!)

6. Then you shall see they are deleted. (For some reason we don't know, it failed when editing a staggered deadline assignment.)

Solution

1.Modify view

File: app/views/sign_up_sheet/_add_topics.html.erb

Add bottoms of 'Delete select topics' and 'Select all'

  <input type="button" value="Delete select topics" onclick="deleteTopics()" />|

  <a id="select all " onclick="checkAll()">Select all</a> |

File: app/views/sign_up_sheet/_table_header.html.erb

Add 'Select' header

  <th width="5%">Select?</th>

File: app/views/sign_up_sheet/_table_line.html.erb

Add selected checkbox

  <td><input type="checkbox" name="Selected-Box"></td>

2.'Select All' function

File: app/assets/javascripts/signup.js

Select All function checks all checkbox of topics.

  function selectAll(source) {
      checkboxes = document.getElementsByName('mySelectBox');
      for (var i = 0, n = checkboxes.length; i < n; i++) {
          checkboxes[i].checked = source.checked;
      }
  }

3.'Delete' function

File: app/controllers/sign_up_sheet_controller.rb

Define delete all and get selected topics methods.

  # This deletes all selected topics
  def delete_all_selected_topics
    load_all_selected_topics
    @stopics.each(&:destroy)
    flash[:success] = "All selected topics have been deleted successfully."
    respond_to do |format|
      format.html { redirect_to edit_assignment_path(params[:a_id]) + "#tabs-2" }
      format.js {}
    end
  end

  # This get all selected topics
  def load_all_selected_topics
    @stopics = SignUpTopic.where(assignment_id: params[:a_id], topic_identifier: params[:idents])
  end

File: app/views/sign_up_sheet/_add_signup_topics.html.erb

  #change <table class="table table-striped"> to
  <table class="table table-striped" id="TopicTable">

File: app/views/sign_up_sheet/_add_topics.html.erb

Delete function destroys all selected topics.

  <script>
  function deleteTopics() {
    var msg = 'Are you sure? It will destroy all selected topics';
    if (confirm(msg)) {
        var identifiers = []
        $("#TopicTable input[type=checkbox]:checked").each(function() {
            var ient = $(this).closest('tr').find('#ident').text();
            identifiers.push(ient);
        });
        jQuery.ajax({
            url: '/sign_up_sheet/delete_all_selected_topics',
            method: 'POST',
            data: {
                idents: identifiers,
                a_id: <%= @assignment.id %>
            },
            success: function() {
                location.reload();
            }
        });
    } else {
        window.location.href = '<%= edit_assignment_path(@assignment.id) + "#tabs-2" %>';
    }
  }
  </script> 

File: app/views/sign_up_sheet/_table_line.html.erb

  #change <td><%= topic.topic_identifier %></td> to
  <td id='ident'><%= topic.topic_identifier %></td>

File: config/routes.rb

Add url.

  post :delete_all_selected_topics

Result

Before clicking 'Select all' bottom, there are checkboxes that could select each topic. After clicking 'Select all' bottom, all checkboxes are selected.

After pushing 'Deleted selected topics', there's a confirmation alert. After clicking yes could delete all topics.

Test

File: spec/controllers/sign_up_sheet_controller_spec.rb

Select assignment with id '834' and topic with id ['E1732'] as params. Post params to delete_all_selected_topics. Expect success flash with 'All selected topics have been deleted successfully.' and redirect to '/assignments/834/edit#tabs-2'.

  describe '#delete_all_selected_topics' do
    it 'delete_all_selected_topics and redirects to edit assignment page' do
      allow(SignUpTopic).to receive(:find).with(assignment_id: '834',topic_identifier: ['E1732']).and_return(topic)
      params = {assignment_id: 834, idents: ['E1732']}
      post :delete_all_selected_topics, params
      expect(flash[:success]).to eq('All selected topics have been deleted successfully.')
      expect(response).to redirect_to('/assignments/834/edit#tabs-2')
    end
  end