Fix failing specs

test/models/book.rb

@@ -2,7 +2,7 @@
 
 class Book < ActiveRecord::Base
   belongs_to :topic, inverse_of: :books
-  belongs_to :tag, foreign_key: [:tag_id, :parent_id]
+  belongs_to :tag, foreign_key: [:tag_id, :parent_id] unless ENV["SKIP_COMPOSITE_PK"]
 
   has_many :chapters, inverse_of: :book
   has_many :discounts, as: :discountable

test/models/customer.rb

@@ -1,8 +1,10 @@
 # frozen_string_literal: true
 
 class Customer < ActiveRecord::Base
-  has_many :orders,
-    inverse_of: :customer,
-    primary_key: %i(account_id id),
-    foreign_key: %i(account_id customer_id)
+  unless ENV["SKIP_COMPOSITE_PK"]
+    has_many :orders,
+      inverse_of: :customer,
+      primary_key: %i(account_id id),
+      foreign_key: %i(account_id customer_id)
+  end
 end

test/models/order.rb

@@ -1,8 +1,10 @@
 # frozen_string_literal: true
 
 class Order < ActiveRecord::Base
-  belongs_to :customer,
-    inverse_of: :orders,
-    primary_key: %i(account_id id),
-    foreign_key: %i(account_id customer_id)
+  unless ENV["SKIP_COMPOSITE_PK"]
+    belongs_to :customer,
+      inverse_of: :orders,
+      primary_key: %i(account_id id),
+      foreign_key: %i(account_id customer_id)
+  end
 end