3 - Ajout du modele Combat

README.md

@@ -111,3 +111,30 @@ irb(main):012:0> Creature.first
  updated_at: Sun, 26 Mar 2023 14:11:33.479248000 UTC +00:00,
  size: "giant">
 ```
+
+Question 3 :
+
+* Je génère la migration pour ajouter les combats avec : `rails g migration CreateCombat result:integer name:string left_fighter:references right_fighter:references winner:references`
+
+Cette migration sera pré-chargée avec :
+
+```ruby
+class CreateCombat < ActiveRecord::Migration[7.0]
+  def change
+    create_table :combats do |t|
+      t.integer :result
+      t.string :name
+      t.references :left_fighter, null: false, foreign_key: true
+      t.references :right_fighter, null: false, foreign_key: true
+      t.references :winner, null: false, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end
+```
+
+Il va falloir préciser vers quelle table doit pointer la foreign key, pour ça on remplace `foreign_key: true` par `foreign_key: { to_table: 'creatures' }`.
+
+On remplacera aussi le `null: false` de la référence `winner` pour supporter de ne pas en avoir.
+

app/models/combat.rb

@@ -0,0 +1,7 @@
+class Combat < ApplicationRecord
+  enum :result, [:draw, :domination]
+
+  belongs_to :left_fighter, class_name: 'Creature'
+  belongs_to :right_fighter, class_name: 'Creature'
+  belongs_to :winner, class_name: 'Creature'
+end

db/migrate/20230326160630_create_combat.rb

@@ -0,0 +1,13 @@
+class CreateCombat < ActiveRecord::Migration[7.0]
+  def change
+    create_table :combats do |t|
+      t.integer :result
+      t.string :name
+      t.references :left_fighter, null: false, foreign_key: { to_table: 'creatures' }
+      t.references :right_fighter, null: false, foreign_key: { to_table: 'creatures' }
+      t.references :winner, null: true, foreign_key: { to_table: 'creatures' }
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,20 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2023_03_26_140943) do
+ActiveRecord::Schema[7.0].define(version: 2023_03_26_160630) do
+  create_table "combats", force: :cascade do |t|
+    t.integer "result"
+    t.string "name"
+    t.integer "left_fighter_id", null: false
+    t.integer "right_fighter_id", null: false
+    t.integer "winner_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["left_fighter_id"], name: "index_combats_on_left_fighter_id"
+    t.index ["right_fighter_id"], name: "index_combats_on_right_fighter_id"
+    t.index ["winner_id"], name: "index_combats_on_winner_id"
+  end
+
   create_table "creatures", force: :cascade do |t|
     t.string "name"
     t.integer "health_points"
@@ -19,4 +32,7 @@ ActiveRecord::Schema[7.0].define(version: 2023_03_26_140943) do
     t.integer "size"
   end
 
+  add_foreign_key "combats", "creatures", column: "left_fighter_id"
+  add_foreign_key "combats", "creatures", column: "right_fighter_id"
+  add_foreign_key "combats", "creatures", column: "winner_id"
 end