update event schema and model

app/models/event.rb

@@ -0,0 +1,19 @@
+class Event < ActiveRecord::Base
+  self.table_name = 'events'
+
+  # associations
+
+  belongs_to :eventable, polymorphic: true
+
+  # validations
+
+  validates :user_id, presence: true
+  validates :tenant_id, presence: true
+
+  validates :type, presence: true, length: { maximum: 255 }
+
+  validates :eventable_type, presence: true, length: { maximum: 255 },
+    if: -> { eventable_id.present? }
+
+  validates :eventable_id, presence: true, if: -> { eventable_type.present? }
+end

db/migrate/20240114120424_create_events.rb

@@ -4,16 +4,13 @@ def change
       t.bigint :user_id, null: false
       t.bigint :tenant_id, null: false
 
-      t.text :type, null: false
-
-      t.text :eventable_type, null: false
-      t.bigint :eventable_id, null: false
-
+      t.string :type, null: false, limit: 255
       t.jsonb :body
-
       t.datetime :created_at, null: false
-    end
 
-    add_index :events, [:eventable_type, :eventable_id]
+      t.string :eventable_type, null: false, limit: 255
+      t.bigint :eventable_id, null: false
+      t.index [:eventable_type, :eventable_id]
+    end
   end
 end