Added WorkItems as a new subject for TrackedTimeEntries.

- Made TrackedTimeEntries polymorphic to belong to both Lecture and WorkItems models
- Added associated migrations for existing data
- Added to administrate UI

app/dashboards/course_dashboard.rb

@@ -10,6 +10,7 @@ class CourseDashboard < Administrate::BaseDashboard
   ATTRIBUTE_TYPES = {
     id: Field::Number,
     lectures: Field::HasMany,
+    work_items: Field::HasMany,
     recordings: Field::HasMany,
     panopto_folders: Field::String.with_options(searchable: false),
     semester_start_date: Field::Date,
@@ -29,6 +30,7 @@ class CourseDashboard < Administrate::BaseDashboard
     title
     unit_code
     lectures
+    work_items
     recordings
   ].freeze
 
@@ -42,6 +44,7 @@ class CourseDashboard < Administrate::BaseDashboard
     semester_start_date
     toggl_project
     lectures
+    work_items
     recordings
     created_at
     updated_at

app/dashboards/work_item_dashboard.rb

@@ -0,0 +1,72 @@
+require "administrate/base_dashboard"
+
+class WorkItemDashboard < Administrate::BaseDashboard
+  # ATTRIBUTE_TYPES
+  # a hash that describes the type of each of the model's fields.
+  #
+  # Each different type represents an Administrate::Field object,
+  # which determines how the attribute is displayed
+  # on pages throughout the dashboard.
+  ATTRIBUTE_TYPES = {
+    id: Field::Number,
+    course: Field::BelongsTo,
+    due_date: Field::DateTime,
+    title: Field::String,
+    tracked_time_entries: Field::HasMany,
+    created_at: Field::DateTime,
+    updated_at: Field::DateTime,
+  }.freeze
+
+  # COLLECTION_ATTRIBUTES
+  # an array of attributes that will be displayed on the model's index page.
+  #
+  # By default, it's limited to four items to reduce clutter on index pages.
+  # Feel free to add, remove, or rearrange items.
+  COLLECTION_ATTRIBUTES = %i[
+    id
+    course
+    due_date
+    title
+  ].freeze
+
+  # SHOW_PAGE_ATTRIBUTES
+  # an array of attributes that will be displayed on the model's show page.
+  SHOW_PAGE_ATTRIBUTES = %i[
+    id
+    course
+    due_date
+    title
+    tracked_time_entries
+    created_at
+    updated_at
+  ].freeze
+
+  # FORM_ATTRIBUTES
+  # an array of attributes that will be displayed
+  # on the model's form (`new` and `edit`) pages.
+  FORM_ATTRIBUTES = %i[
+    course
+    due_date
+    title
+    tracked_time_entries
+  ].freeze
+
+  # COLLECTION_FILTERS
+  # a hash that defines filters that can be used while searching via the search
+  # field of the dashboard.
+  #
+  # For example to add an option to search for open resources by typing "open:"
+  # in the search field:
+  #
+  #   COLLECTION_FILTERS = {
+  #     open: ->(resources) { resources.where(open: true) }
+  #   }.freeze
+  COLLECTION_FILTERS = {}.freeze
+
+  # Overwrite this method to customize how work items are displayed
+  # across all pages of the admin dashboard.
+  #
+  # def display_resource(work_item)
+  #   "WorkItem ##{work_item.id}"
+  # end
+end