Make lectures belong to courses

app/models/lecture.rb

@@ -1,4 +1,6 @@
 class Lecture < ApplicationRecord
+  belongs_to :course
+
   enum :status, [
     :future,
     :live,

db/migrate/20230929171856_add_course_id_to_lectures.rb

@@ -0,0 +1,5 @@
+class AddCourseIdToLectures < ActiveRecord::Migration[7.0]
+  def change
+    add_belongs_to(:lectures, :course)
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2023_09_29_171730) do
+ActiveRecord::Schema[7.0].define(version: 2023_09_29_171856) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -30,6 +30,8 @@ ActiveRecord::Schema[7.0].define(version: 2023_09_29_171730) do
     t.string "recording_id", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.bigint "course_id"
+    t.index ["course_id"], name: "index_lectures_on_course_id"
   end
 
 end