Add assign merchant rule for transactions (#2174)

app/models/rule/action_executor/set_transaction_merchant.rb

@@ -0,0 +1,30 @@
+class Rule::ActionExecutor::SetTransactionMerchant < Rule::ActionExecutor
+  def type
+    "select"
+  end
+
+  def options
+    family.merchants.pluck(:name, :id)
+  end
+
+  def execute(transaction_scope, value: nil, ignore_attribute_locks: false)
+    merchant = family.merchants.find_by_id(value)
+    return unless merchant
+
+    scope = transaction_scope
+    unless ignore_attribute_locks
+      scope = scope.enrichable(:merchant_id)
+    end
+
+    scope.each do |txn|
+      Rule.transaction do
+        txn.log_enrichment!(
+          attribute_name: "merchant_id",
+          attribute_value: merchant.id,
+          source: "rule"
+        )
+        txn.update!(merchant: merchant)
+      end
+    end
+  end
+end