Fix: ActiveRecord::DeleteRestrictionError (MAYBE-RAILS-CA)

app/models/account/transaction.rb

@@ -6,8 +6,8 @@ class Account::Transaction < ApplicationRecord
   has_many :taggings, as: :taggable, dependent: :destroy
   has_many :tags, through: :taggings
 
-  has_one :transfer_as_inflow, class_name: "Transfer", foreign_key: "inflow_transaction_id", dependent: :restrict_with_exception
-  has_one :transfer_as_outflow, class_name: "Transfer", foreign_key: "outflow_transaction_id", dependent: :restrict_with_exception
+  has_one :transfer_as_inflow, class_name: "Transfer", foreign_key: "inflow_transaction_id", dependent: :destroy
+  has_one :transfer_as_outflow, class_name: "Transfer", foreign_key: "outflow_transaction_id", dependent: :destroy
 
   accepts_nested_attributes_for :taggings, allow_destroy: true
 

test/models/transfer_test.rb

@@ -97,4 +97,20 @@
       transfer.save!
     end
   end
+
+  test "deleting a transaction deletes associated transfer" do
+    outflow_entry = create_transaction(date: Date.current, account: accounts(:depository), amount: 500)
+    inflow_entry = create_transaction(date: Date.current, account: accounts(:credit_card), amount: -500)
+
+    transfer = Transfer.create!(
+      inflow_transaction: inflow_entry.account_transaction,
+      outflow_transaction: outflow_entry.account_transaction
+    )
+
+    assert_difference 'Transfer.count', -1 do
+      outflow_entry.account_transaction.destroy
+    end
+
+    assert_nil Transfer.find_by(id: transfer.id)
+  end
 end