Implement favoriting of courses

app/controllers/crawlers/courses_crawler_controller.rb

@@ -40,6 +40,27 @@ class Crawlers::CoursesCrawlerController < Crawlers::TissCrawlerController
   end
 
   def add_to_fav
+    params[:api] = '/api/course/'
+    regex = params[:detail_url].match(/courseNr=(?<number>\S{6})/)
+    params[:number] = regex[:number]
+    regex = params[:detail_url].match(/semester=(?<semester>\d{4}[SW])/)
+    params[:semester] = regex[:semester]
+
+    @course = TissCrawler.get_course_details(params)
+
+    # create stores the object to the db after creation
+    favorite_hash = {number: @course['courseNumber'],
+                     semester: @course['semesterCode'],
+                     title: @course['title']['de'],
+                     # the user who is currently active
+                     user_id: current_user.id}
+    if FavoriteCourse.create(favorite_hash).valid?
+      FavoriteCourse.create(favorite_hash)
+      flash[:alert] = 'Course added to your favorites!'
+    else
+      flash[:alert] = 'Course is already favorited!'
+    end
+    redirect_back(fallback_location: search)
   end
 
 end

app/models/favorite_course.rb

@@ -0,0 +1,4 @@
+class FavoriteCourse < ApplicationRecord
+  validates :title, :semester, :number, presence: true
+  validates :semester, :number, uniqueness: {scope: [:semester, :number]}
+end