Fixed pass courses list on instructor page

schedules/app/controllers/instructors_controller.rb

@@ -16,6 +16,12 @@ class InstructorsController < ApplicationController
     sections.each do |s|
       @courses.add s.course
     end
+
+    @past = []
+    @instructor.course_sections.map(&:course).each do |c|
+      @past << c unless @past.select { |past| past.full_name == c.full_name }.count.positive?
+    end
+    @past.sort_by!(&:full_name)
   end
 
   private

schedules/app/views/instructors/show.html.erb

 <div class="row">
     <div class="col-lg-4 col-12">
 	<h1><%= @instructor.name %></h1>
-	<% prev = @instructor.course_sections.map(&:course).uniq.reject { |c| c.semester == @semester } %>
-
-	<% if prev.count.positive? %>
+	<% if @past.count.positive? %>
 	    <strong>Previously taught: </strong>
 	    <ul>
-		<% prev.each do |s| %>
-		    <li><%= link_to s.full_name, course_path(s)  %></li>
+		<% @past.each do |c| %>
+		    <li><%= link_to c.full_name, course_path(c)  %></li>
 		<% end %>
 	    </ul>
 	<% end %>