feat: add migration to create CaseLog and instructor invitiations

Author: cbothner

db/migrate/20180129143420_add_case_log.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+class AddCaseLog < ActiveRecord::Migration[5.1]
+  def change
+    reversible do |dir|
+      dir.up do
+        Role.create name: :instructor
+
+        Community.create(
+          name: 'CaseLog',
+          universal: true,
+          description: <<~DESCRIPTION
+            CaseLog is a community of practice for instructors teaching with
+            cases on Gala. Case studies, like all forms of engaged learning,
+            work best when they’re tuned for your specific audience. As you and
+            your teaching team prepare to use a case with your students, read
+            other instructors’ write-ups about what worked and what didn’t in
+            their classroom. These “meta case studies” will provide some
+            inspiration.\n
+            After you’ve deployed this case, add your voice to the conversation.
+            Share the choices you made and why you made them. Did you structure
+            your classroom discussion in a particular way? Did you employ an
+            interesting simulation or exercise? Tell us about it.
+            DESCRIPTION
+        )
+
+        Reader.joins(:enrollments)
+              .where(enrollments: { status: :instructor })
+              .distinct
+              .find_each { |reader| reader.add_role :instructor }
+      end
+      dir.down do
+        Community.where(name: 'CaseLog', universal: true).each(&:destroy)
+
+        Role.where(name: :instructor).destroy
+      end
+    end
+  end
+end

db/seeds.rb

@@ -7,12 +7,12 @@
 Community.create name: 'CaseLog', universal: true, description: <<~DESCRIPTION
   CaseLog is a community of practice for instructors teaching with cases on
   Gala. Case studies, like all forms of engaged learning, work best when they’re
-  tuned for your specific audience. As you prepare to use a case with your
-  students, read other instructors’ write-ups about what worked and what didn’t
-  in their classroom. Hopefully these “meta case studies” will provide some
-  inspiration.
+  tuned for your specific audience. As you and your teaching team prepare to use
+  a case with your students, read other instructors’ write-ups about what worked
+  and what didn’t in their classroom. These “meta case studies” will provide
+  some inspiration.
 
-  And after you’ve deployed this case, add your voice to the conversation. Share
+  After you’ve deployed this case, add your voice to the conversation. Share
   the choices you made and why you made them. Did you structure your classroom
   discussion in a particular way? Did you employ an interesting simulation or
   exercise? Tell us about it.

db/structure.sql

@@ -2308,6 +2308,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20171031161433'),
 ('20171113192541'),
 ('20171220165301'),
-('20180119170858');
+('20180119170858'),
+('20180129143420');