Start detecting install problems and report them on the admin dashboard. This commit adds check for Rails.env

app/models/admin_dashboard_data.rb

@@ -0,0 +1,22 @@
+class AdminDashboardData
+
+  REPORTS = ['visits', 'signups', 'topics', 'posts', 'flags', 'users_by_trust_level', 'likes', 'emails']
+
+  def self.fetch
+    AdminDashboardData.new
+  end
+
+  def as_json
+    @json ||= {
+      reports: REPORTS.map { |type| Report.find(type) },
+      total_users: User.count,
+      problems: [rails_env_check].compact
+    }.merge(
+      SiteSetting.version_checks? ? {version_check: DiscourseUpdates.check_version} : {}
+    )
+  end
+
+  def rails_env_check
+    I18n.t("dashboard.rails_env_warning", env: Rails.env) unless Rails.env == 'production'
+  end
+end