Extract some related methods to CheckoutSteps concern

app/controllers/concerns/checkout_steps.rb

@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+module CheckoutSteps
+  extend ActiveSupport::Concern
+
+  private
+
+  def summary_step?
+    params[:step] == "summary"
+  end
+
+  def payment_step?
+    params[:step] == "payment"
+  end
+
+  def redirect_to_step_based_on_order
+    case @order.state
+    when "cart", "address", "delivery"
+      redirect_to checkout_step_path(:details)
+    when "payment"
+      redirect_to checkout_step_path(:payment)
+    when "confirmation"
+      redirect_to checkout_step_path(:summary)
+    else
+      redirect_to order_path(@order, order_token: @order.token)
+    end
+  end
+
+  def redirect_to_step
+    case params[:step]
+    when "details"
+      return redirect_to checkout_step_path(:payment)
+    when "payment"
+      return redirect_to checkout_step_path(:summary)
+    end
+    redirect_to_step_based_on_order
+  end
+
+  def check_step
+    case @order.state
+    when "cart", "address", "delivery"
+      redirect_to checkout_step_path(:details) unless params[:step] == "details"
+    when "payment"
+      redirect_to checkout_step_path(:payment) if params[:step] == "summary"
+    end
+  end
+end

app/controllers/split_checkout_controller.rb

@@ -8,6 +8,7 @@ class SplitCheckoutController < ::BaseController
   include OrderStockCheck
   include Spree::BaseHelper
   include CheckoutCallbacks
+  include CheckoutSteps
   include OrderCompletion
   include CablecarResponses
   include WhiteLabel
@@ -129,14 +130,6 @@ class SplitCheckoutController < ::BaseController
     selected_shipping_method.first.require_ship_address == false
   end
 
-  def summary_step?
-    params[:step] == "summary"
-  end
-
-  def payment_step?
-    params[:step] == "payment"
-  end
-
   def advance_order_state
     return if @order.complete?
 
@@ -171,36 +164,4 @@ class SplitCheckoutController < ::BaseController
   def order_params
     @order_params ||= Checkout::Params.new(@order, params, spree_current_user).call
   end
-
-  def redirect_to_step_based_on_order
-    case @order.state
-    when "cart", "address", "delivery"
-      redirect_to checkout_step_path(:details)
-    when "payment"
-      redirect_to checkout_step_path(:payment)
-    when "confirmation"
-      redirect_to checkout_step_path(:summary)
-    else
-      redirect_to order_path(@order, order_token: @order.token)
-    end
-  end
-
-  def redirect_to_step
-    case params[:step]
-    when "details"
-      return redirect_to checkout_step_path(:payment)
-    when "payment"
-      return redirect_to checkout_step_path(:summary)
-    end
-    redirect_to_step_based_on_order
-  end
-
-  def check_step
-    case @order.state
-    when "cart", "address", "delivery"
-      redirect_to checkout_step_path(:details) unless params[:step] == "details"
-    when "payment"
-      redirect_to checkout_step_path(:payment) if params[:step] == "summary"
-    end
-  end
 end