Add a rake task to migrate adjustments from legacy promotions

Also has a task to migrate back.

lib/solidus_friendly_promotions/migrate_adjustments.rb

@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+module SolidusFriendlyPromotions
+  class MigrateAdjustments
+    class << self
+      def up
+        sql = <<~SQL
+          UPDATE spree_adjustments
+          SET source_id = friendly_promotion_actions.id,
+            source_type = 'SolidusFriendlyPromotions::PromotionAction'
+            FROM spree_promotion_actions
+            INNER JOIN friendly_promotion_actions ON friendly_promotion_actions.original_promotion_action_id = spree_promotion_actions.id
+            WHERE spree_adjustments.source_id = spree_promotion_actions.id and spree_adjustments.source_type = 'Spree::PromotionAction'
+        SQL
+
+        execute(sql)
+      end
+
+      def down
+        sql = <<~SQL
+          UPDATE spree_adjustments
+          SET source_id = spree_promotion_actions.id,
+            source_type = 'Spree::PromotionAction'
+            FROM spree_promotion_actions
+            INNER JOIN friendly_promotion_actions ON friendly_promotion_actions.original_promotion_action_id = spree_promotion_actions.id
+            WHERE spree_adjustments.source_id = friendly_promotion_actions.id and spree_adjustments.source_type = 'SolidusFriendlyPromotions::PromotionAction'
+        SQL
+
+        execute(sql)
+      end
+
+      private
+
+      def execute(sql)
+        Spree::Adjustment.transaction do
+          ActiveRecord::Base.connection.execute(sql)
+        end
+      end
+    end
+  end
+end

lib/tasks/solidus_friendly_promotions/migrate_adjustments.rake

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+namespace :solidus_friendly_promotions do
+  namespace :migrate_adjustments do
+    desc "Migrate adjustments with Spree::PromotionAction sources to SolidusFriendlyPromotions::PromotionAction sources"
+    task up: :environment do
+      require "solidus_friendly_promotions/migrate_adjustments"
+      SolidusFriendlyPromotions::MigrateAdjustments.up
+    end
+
+    desc "Migrate adjustments with SolidusFriendlyPromotions::PromotionAction sources to Spree::PromotionAction sources"
+    task down: :environment do
+      require "solidus_friendly_promotions/migrate_adjustments"
+      SolidusFriendlyPromotions::MigrateAdjustments.down
+    end
+  end
+end

spec/lib/solidus_friendly_promotions/migrate_adjustments_spec.rb

@@ -0,0 +1,74 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+require "solidus_friendly_promotions/promotion_migrator"
+require "solidus_friendly_promotions/promotion_map"
+require "solidus_friendly_promotions/migrate_adjustments"
+
+RSpec.describe SolidusFriendlyPromotions::MigrateAdjustments do
+  let(:promotion) { create(:promotion, :with_adjustable_action) }
+  let(:order) { create(:order_with_line_items) }
+  let(:line_item) { order.line_items.first }
+  let(:tax_rate) { create(:tax_rate) }
+
+  before do
+    line_item.adjustments.create!(
+      source: tax_rate,
+      amount: -3,
+      label: "Business tax",
+      eligible: true,
+      included: true,
+      order: order
+    )
+    line_item.adjustments.create!(
+      source: promotion.actions.first,
+      amount: -2,
+      label: "Promotion (Because we like you)",
+      eligible: true,
+      order: order
+    )
+    SolidusFriendlyPromotions::PromotionMigrator.new(
+      SolidusFriendlyPromotions::PROMOTION_MAP
+    ).call
+  end
+
+  describe ".up" do
+    subject { described_class.up }
+
+    it "migrates our adjustment" do
+      spree_promotion_action = Spree::PromotionAction.first
+      friendly_promotion_action = SolidusFriendlyPromotions::PromotionAction.first
+      expect { subject }.to change {
+        Spree::Adjustment.promotion.first.source
+      }.from(spree_promotion_action).to(friendly_promotion_action)
+    end
+
+    it "will not touch tax adjustments" do
+      expect { subject }.not_to change {
+        Spree::Adjustment.tax.first.attributes
+      }
+    end
+  end
+
+  describe ".down" do
+    subject { described_class.down }
+
+    before do
+      described_class.up
+    end
+
+    it "migrates our adjustment" do
+      spree_promotion_action = Spree::PromotionAction.first
+      friendly_promotion_action = SolidusFriendlyPromotions::PromotionAction.first
+      expect { subject }.to change {
+        Spree::Adjustment.promotion.first.source
+      }.from(friendly_promotion_action).to(spree_promotion_action)
+    end
+
+    it "will not touch tax adjustments" do
+      expect { subject }.not_to change {
+        Spree::Adjustment.tax.first.attributes
+      }
+    end
+  end
+end