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

db/migrate/20200521091231_create_favorite_courses.rb

@@ -0,0 +1,13 @@
+class CreateFavoriteCourses < ActiveRecord::Migration[6.0]
+  def change
+    create_table :favorite_courses do |t|
+      t.string :number, null: false
+      t.string :semester, null: false
+      t.string :title, null: false
+      t.integer :user_id, null: false
+
+      t.timestamps
+    end
+    add_index :favorite_courses, [:number, :semester], unique: true
+  end
+end

db/schema.rb

@@ -10,7 +10,17 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_04_21_152314) do
+ActiveRecord::Schema.define(version: 2020_05_21_091231) do
+
+  create_table "favorite_courses", force: :cascade do |t|
+    t.string "number", null: false
+    t.string "semester", null: false
+    t.string "title", null: false
+    t.integer "user_id", null: false
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["number", "semester"], name: "index_favorite_courses_on_number_and_semester", unique: true
+  end
 
   create_table "favorite_people", id: false, force: :cascade do |t|
     t.integer "tiss_id", null: false

test/fixtures/favorite_courses.yml

@@ -0,0 +1,11 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+# This model initially had no columns defined. If you add columns to the
+# model remove the '{}' from the fixture names and add the columns immediately
+# below each fixture, per the syntax in the comments below
+#
+one: {}
+# column: value
+#
+two: {}
+# column: value

test/models/favorite_course_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class FavoriteCourseTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end