Add coauthorship notification

Author: lmrodriguezr

app/controllers/registers_controller.rb

@@ -275,18 +275,24 @@ def coauthors_commit
     @coauthor = User.find_by_email_or_username(@register.coauthor)
     if @coauthor.present?
       rc_par = { register: @register, user: @coauthor }
+      notify = true
       rc =
         case params['register']['action']
         when 'unlink'
           RegisterCoauthor.find_by(rc_par).destroy
         when 'up'
+          notify = false
           RegisterCoauthor.find_by(rc_par).tap(&:move_up)
         else
           rc_par.merge!(order: @register.register_coauthors.size + 1)
           RegisterCoauthor.new(rc_par).tap(&:save)
         end
 
       if rc && !rc.errors.present?
+        Notification.create(
+          user: @coauthor, notifiable: @register,
+          action: :coauthor_register, title: 'Authorship status changed'
+        ) if notify
         flash[:notice] = 'Successfully updated coauthors'
         redirect_back(fallback_location: @register)
       else

app/mailers/admin_mailer.rb

@@ -16,6 +16,9 @@ def templated_email
     when :status
       # For observers
       observer_status_email
+    when :coauthor_register
+      # For added/removed authors in a register list
+      coauthor_register_email
     else
       if @object.is_a? Name
         # All other name status changes
@@ -93,6 +96,19 @@ def correspondence_email
     )
   end
 
+  ##
+  # Email coauthors when added to or removed from a register list
+  def coauthor_register_email
+    return unless @user.opt_message_email? || @user.opt_regular_email?
+
+    @object = params[:object]
+
+    mail(
+      subject: 'Your authorship status changed in SeqCode Registry list',
+      template_name: 'coauthor_register_email'
+    )
+  end
+
   ##
   # Email notifying observers of a new status change
   def observer_status_email

app/views/admin_mailer/coauthor_register_email.html.erb

@@ -0,0 +1,17 @@
+<p>Your authorship status for the following list has changed
+<%= link_to(@object.display, @object) %>.</p>
+<br/>
+
+<h2>What does this mean?</h2>
+<p>
+  The submitting author of the list or a curator has added you or
+  removed you as a coauthor
+</p>
+<br/>
+
+<h2>What to do next?</h2>
+<p>
+  If you were expecting this change, you don't need to take any action.
+  Otherwise, please <%= link_to('contact us', page_connect_url) %>.
+</p>
+

app/views/admin_mailer/coauthor_register_email.text.erb

@@ -0,0 +1,19 @@
+Your authorship status for the following list has changed
+<%= @object.display %>
+
+What does this mean?
+====================
+
+The submitting author of the list or a curator has added you or
+removed you as a coauthor
+
+To view the entry in the Registry, visit:
+<%= polymorphic_url(@object) %>
+
+What to do next?
+================
+
+If you were expecting this change, you don't need to take any action.
+
+Otherwise, please contact us: <%= page_connect_url %>
+