init project

app/models/customer.rb

@@ -0,0 +1,11 @@
+class Customer < ApplicationRecord
+  default_scope { order(created_at: :desc) }
+
+  belongs_to :school
+  belongs_to :partner_manager_group, optional: true
+
+  has_many :partner_customers, dependent: :destroy
+  has_many :partners, through: :partner_customers
+
+  has_many :users
+end