add covenant

app/models/wow_covenant.rb

@@ -0,0 +1,10 @@
+class WowCovenant < ApplicationRecord
+  extend Mobility
+  translates :name, :description
+
+  has_many :wow_covenant_progresses, dependent: :nullify
+  has_many :wow_characters, through: :wow_covenant_progresses
+
+  validates :name, presence: true
+  validates :covenant_id, presence: true, uniqueness: true
+end