Can revert changes to email templates

app/assets/javascripts/admin/controllers/admin-customize-email-templates-edit.js.es6

@@ -6,11 +6,23 @@ export default Ember.Controller.extend(bufferedProperty('emailTemplate'), {
 
   actions: {
     saveChanges() {
-      const model = this.get('emailTemplate');
       const buffered = this.get('buffered');
-      model.save(buffered.getProperties('subject', 'body')).then(() => {
+      this.get('emailTemplate').save(buffered.getProperties('subject', 'body')).then(() => {
         this.set('saved', true);
       }).catch(popupAjaxError);
+    },
+
+    revertChanges() {
+      this.set('saved', false);
+      bootbox.confirm(I18n.t('admin.customize.email_templates.revert_confirm'), result => {
+        if (result) {
+          this.get('emailTemplate').revert().then(props => {
+            const buffered = this.get('buffered');
+            buffered.setProperties(props);
+            this.commitBuffer();
+          }).catch(popupAjaxError);
+        }
+      });
     }
   }
 });

app/assets/javascripts/admin/models/email-template.js.es6

@@ -0,0 +1,12 @@
+import RestModel from 'discourse/models/rest';
+
+const { getProperties } = Ember;
+console.log(getProperties);
+
+export default RestModel.extend({
+  revert() {
+    return Discourse.ajax(`/admin/customize/email_templates/${this.get('id')}`, {
+      method: 'DELETE'
+    }).then(result => getProperties(result.email_template, 'subject', 'body', 'can_revert'));
+  }
+});

app/assets/javascripts/admin/templates/components/save-controls.hbs

@@ -1,2 +1,5 @@
-{{d-button action="saveChanges" disabled=buttonDisabled label=savingText}}
-{{#if saved}}{{i18n 'saved'}}{{/if}}
+{{d-button action="saveChanges" disabled=buttonDisabled label=savingText class="btn-primary"}}
+{{yield}}
+<div class='save-messages'>
+  {{#if saved}}{{i18n 'saved'}}{{/if}}
+</div>

app/assets/javascripts/admin/templates/customize-email-templates-edit.hbs

@@ -9,5 +9,9 @@
     {{d-editor value=buffered.body}}
   </label>
 
-  {{save-controls model=emailTemplate action="saveChanges" saved=saved}}
+  {{#save-controls model=emailTemplate action="saveChanges" saved=saved}}
+    {{#if emailTemplate.can_revert}}
+      {{d-button action="revertChanges" label="admin.customize.email_templates.revert"}}
+    {{/if}}
+  {{/save-controls}}
 </div>

app/assets/stylesheets/common/admin/admin_base.scss

@@ -122,6 +122,10 @@ td.flaggers td {
 
 .admin-container .controls {
   @include clearfix;
+
+  .save-messages {
+    margin-top: 1em;
+  }
 }
 
 .admin-title {

app/controllers/admin/email_templates_controller.rb

@@ -35,7 +35,6 @@ class Admin::EmailTemplatesController < Admin::AdminController
   def update
     et = params[:email_template]
     key = params[:id]
-
     raise Discourse::NotFound unless self.class.email_keys.include?(params[:id])
 
     TranslationOverride.upsert!(I18n.locale, "#{key}.subject_template", et[:subject])
@@ -44,6 +43,13 @@ class Admin::EmailTemplatesController < Admin::AdminController
     render_serialized(key, AdminEmailTemplateSerializer, root: 'email_template', rest_serializer: true)
   end
 
+  def revert
+    key = params[:id]
+    raise Discourse::NotFound unless self.class.email_keys.include?(params[:id])
+    TranslationOverride.revert!(I18n.locale, "#{key}.subject_template", "#{key}.text_body_template")
+    render_serialized(key, AdminEmailTemplateSerializer, root: 'email_template', rest_serializer: true)
+  end
+
   def index
     render_serialized(self.class.email_keys, AdminEmailTemplateSerializer, root: 'email_templates', rest_serializer: true)
   end

app/models/translation_override.rb

@@ -6,8 +6,19 @@ class TranslationOverride < ActiveRecord::Base
     params = { locale: locale, translation_key: key }
     row_count = where(params).update_all(value: value)
     create!(params.merge(value: value)) if row_count == 0
-
-    MessageBus.publish('/i18n-flush', { refresh: true })
+    i18n_changed
   end
 
+  def self.revert!(locale, *keys)
+    TranslationOverride.where(locale: locale, translation_key: keys).delete_all
+    i18n_changed
+  end
+
+  protected
+
+    def self.i18n_changed
+      I18n.reload!
+      MessageBus.publish('/i18n-flush', { refresh: true })
+    end
+
 end

app/serializers/admin_email_template_serializer.rb

@@ -1,5 +1,5 @@
 class AdminEmailTemplateSerializer < ApplicationSerializer
-  attributes :id, :title, :subject, :body
+  attributes :id, :title, :subject, :body, :can_revert?
 
   def id
     object
@@ -10,10 +10,19 @@ class AdminEmailTemplateSerializer < ApplicationSerializer
   end
 
   def subject
-    I18n.t("#{object}.subject_template")
+    @subject ||= I18n.t("#{object}.subject_template")
   end
 
   def body
-    I18n.t("#{object}.text_body_template")
+    @body ||= I18n.t("#{object}.text_body_template")
+  end
+
+  def can_revert?
+    current_body, current_subject = body, subject
+
+    I18n.overrides_disabled do
+      return I18n.t("#{object}.subject_template") != current_subject ||
+             I18n.t("#{object}.text_body_template") != current_body
+    end
   end
 end

config/locales/client.en.yml

@@ -2093,6 +2093,8 @@ en:
           subject: "Subject"
           body: "Body"
           none_selected: "Select an email template to begin editing."
+          revert: "Revert Changes"
+          revert_confirm: "Are you sure you want to revert your changes?"
 
         css_html:
           title: "CSS/HTML"

config/routes.rb

@@ -163,6 +163,7 @@ Discourse::Application.routes.draw do
       get 'email_templates' => 'email_templates#index'
       match 'email_templates/(:id)' => 'email_templates#show', :constraints => { :id => /[0-9a-z\_\.]+/ }, via: :get
       match 'email_templates/(:id)' => 'email_templates#update', :constraints => { :id => /[0-9a-z\_\.]+/ }, via: :put
+      match 'email_templates/(:id)' => 'email_templates#revert', :constraints => { :id => /[0-9a-z\_\.]+/ }, via: :delete
     end
 
     resources :embeddable_hosts, constraints: AdminConstraint.new