Add form field to set tax when creating adjustment on order. Display tax included in adjustments on order interface.

app/models/spree/adjustment_decorator.rb

@@ -24,6 +24,10 @@ module Spree
       update_attributes! included_tax: tax.round(2)
     end
 
+    def display_included_tax
+      Spree::Money.new(included_tax, { :currency => currency })
+    end
+
     def has_tax?
       included_tax > 0
     end

app/overrides/spree/admin/adjustments/_adjustments_table/add_tax_to_body.html.haml.deface

@@ -0,0 +1,9 @@
+/ replace_contents "[data-hook='adjustment_row']"
+
+%td.align-center.created_at= pretty_time(adjustment.created_at)
+%td.align-center.label= adjustment.label
+%td.align-center.amount= adjustment.display_amount.to_html
+%td.align-center.included-tax= adjustment.display_included_tax.to_html
+%td.actions
+  = link_to_edit adjustment, no_text: true
+  = link_to_delete adjustment, no_text: true

app/overrides/spree/admin/adjustments/_adjustments_table/add_tax_to_head.html.haml.deface

@@ -0,0 +1,8 @@
+/ replace_contents "[data-hook='adjustmment_head']"
+
+%tr
+  %th= "#{t('spree.date')}/#{t('spree.time')}"
+  %th= t(:description)
+  %th= t(:amount)
+  %th= t(:included_tax)
+  %th.actions

app/overrides/spree/admin/adjustments/_form/add_tax_rate.html.haml.deface

@@ -0,0 +1,6 @@
+/ replace_contents "[data-hook='admin_adjustment_form_fields']"
+
+- if @adjustment.new_record?
+  = render 'new_form', f: f
+- else
+  = render 'edit_form', f: f

app/views/spree/admin/adjustments/_new_form.html.haml

@@ -0,0 +1,17 @@
+.row
+  .alpha.three.columns
+    = f.field_container :amount do
+      = f.label :amount, raw(t(:amount) + content_tag(:span, " *", :class => "required"))
+      = text_field :adjustment, :amount, :class => 'fullwidth'
+      = f.error_message_on :amount
+  .omega.three.columns
+    = f.field_container :tax_rate_id do
+      = f.label :tax_rate_id, t(:tax)
+      = select_tag :tax_rate_id, options_from_collection_for_select(Spree::TaxRate.all, :id, :name), prompt: t(:none), class: 'fullwidth'
+      = f.error_message_on :tax_rate_id
+.row
+  .alpha.omega.twelve.columns
+    = f.field_container :label do
+      = f.label :label, raw(t(:description) + content_tag(:span, " *", :class => "required"))
+      = text_field :adjustment, :label, :class => 'fullwidth'
+      = f.error_message_on :label

config/locales/en.yml

@@ -38,3 +38,4 @@ en:
   footer_about_url: "About URL"
   footer_tos_url: "Terms of Service URL"
   invoice: "Invoice"
+  included_tax: "Included tax"