Extract method do update I18n contents

This way we can test it properly, which will be helpful when fixing
bugs.

app/controllers/admin/site_customization/information_texts_controller.rb

@@ -7,24 +7,7 @@ class Admin::SiteCustomization::InformationTextsController < Admin::SiteCustomiz
   end
 
   def update
-    content_params.each do |content|
-      values = content[:values].slice(*translation_params)
-
-      unless values.empty?
-        values.each do |key, value|
-          locale = key.split("_").last
-
-          if value == t(content[:id], locale: locale) || value.match(/translation missing/)
-            next
-          else
-            text = I18nContent.find_or_create_by!(key: content[:id])
-            Globalize.with_locale(locale) do
-              text.update!(value: value)
-            end
-          end
-        end
-      end
-    end
+    I18nContent.update(content_params, enabled_translations)
 
     redirect_to admin_site_customization_information_texts_path,
                 notice: t("flash.actions.update.translation")
@@ -48,12 +31,6 @@ class Admin::SiteCustomization::InformationTextsController < Admin::SiteCustomiz
       end
     end
 
-    def translation_params
-      I18nContent.translated_attribute_names.product(enabled_translations).map do |attr_name, loc|
-        I18nContent.localized_attr_name_for(attr_name, loc)
-      end
-    end
-
     def enabled_translations
       params.fetch(:enabled_translations, {}).select { |_, v| v == "1" }.keys
     end

app/models/i18n_content.rb

@@ -118,4 +118,31 @@ class I18nContent < ApplicationRecord
       end.to_h
     end
   end
+
+  def self.update(contents, enabled_translations = I18n.available_locales)
+    contents.each do |content|
+      values = content[:values].slice(*translation_params(enabled_translations))
+
+      unless values.empty?
+        values.each do |key, value|
+          locale = key.split("_").last
+
+          if value == I18n.t(content[:id], locale: locale) || value.match(/translation missing/)
+            next
+          else
+            text = I18nContent.find_or_create_by!(key: content[:id])
+            Globalize.with_locale(locale) do
+              text.update!(value: value)
+            end
+          end
+        end
+      end
+    end
+  end
+
+  def self.translation_params(enabled_translations)
+    translated_attribute_names.product(enabled_translations).map do |attr_name, loc|
+      localized_attr_name_for(attr_name, loc)
+    end
+  end
 end

spec/models/i18n_content_spec.rb

@@ -133,4 +133,26 @@ RSpec.describe I18nContent, type: :model do
       expect(I18nContent.translations_hash(:en)["great"]).to be nil
     end
   end
+
+  describe ".update" do
+    it "stores new keys with a different translation" do
+      I18nContent.update([{ id: "shared.yes", values: { "value_en" => "Oh, yeah" }}])
+
+      expect(I18nContent.count).to eq 1
+      expect(I18nContent.first.translations.count).to eq 1
+      expect(I18nContent.first.value).to eq "Oh, yeah"
+    end
+
+    it "does not store new keys with the default translation" do
+      I18nContent.update([{ id: "shared.yes", values: { "value_en" => "Yes" }}])
+
+      expect(I18nContent.all).to be_empty
+    end
+
+    it "does not store new keys for disabled translations" do
+      I18nContent.update([{ id: "shared.yes", values: { "value_en" => "Oh, yeah" }}], [:es])
+
+      expect(I18nContent.all).to be_empty
+    end
+  end
 end