Add diary entry to exercise

app/models/diary_entry.rb

@@ -1,5 +1,6 @@
 class DiaryEntry < ApplicationRecord
   belongs_to :user
+  has_many :exercises
 
   validates :date,
             :pain_level,

app/models/exercise.rb

@@ -1,3 +1,4 @@
 class Exercise < ApplicationRecord
   belongs_to :type
+  belongs_to :diary_entry
 end

db/migrate/20231229121659_add_diary_entry_to_exercise.rb

@@ -0,0 +1,5 @@
+class AddDiaryEntryToExercise < ActiveRecord::Migration[7.1]
+  def change
+    add_reference :exercises, :diary_entry, null: false, foreign_key: true
+  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[7.1].define(version: 2023_12_29_114804) do
+ActiveRecord::Schema[7.1].define(version: 2023_12_29_121659) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -91,6 +91,8 @@ ActiveRecord::Schema[7.1].define(version: 2023_12_29_114804) do
     t.float "amount", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.bigint "diary_entry_id", null: false
+    t.index ["diary_entry_id"], name: "index_exercises_on_diary_entry_id"
     t.index ["exercise_type_id"], name: "index_exercises_on_exercise_type_id"
   end
 
@@ -144,6 +146,7 @@ ActiveRecord::Schema[7.1].define(version: 2023_12_29_114804) do
   add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
   add_foreign_key "blog_posts", "users"
   add_foreign_key "diary_entries", "users"
+  add_foreign_key "exercises", "diary_entries"
   add_foreign_key "exercises", "exercise_types"
   add_foreign_key "microposts", "users"
 end