Configure Sentry error logger

Gemfile

@@ -71,6 +71,9 @@ gem 'simple_form', '~> 4.1'
 # get, put, post, delete.
 gem 'rest-client', '~> 2.0'
 
+# A gem that provides a client interface for the Sentry error logger.
+gem 'sentry-raven'
+
 group :development, :test do
   # factory_bot provides a framework and DSL for defining and using factories.
   gem 'factory_bot_rails', '~> 4.10'

Gemfile.lock

@@ -91,6 +91,8 @@ GEM
       railties (>= 3.0.0)
     faker (1.9.1)
       i18n (>= 0.7)
+    faraday (0.15.4)
+      multipart-post (>= 1.2, < 3)
     ffi (1.9.25)
     font-awesome-sass (5.5.0.1)
       sassc (>= 1.11)
@@ -130,6 +132,7 @@ GEM
     minitest (5.11.3)
     msgpack (1.2.4)
     multi_json (1.13.1)
+    multipart-post (2.0.0)
     net-scp (1.2.1)
       net-ssh (>= 2.6.5)
     net-ssh (5.0.2)
@@ -229,6 +232,8 @@ GEM
     sassc (2.0.0)
       ffi (~> 1.9.6)
       rake
+    sentry-raven (2.7.4)
+      faraday (>= 0.7.6, < 1.0)
     shoulda-matchers (4.0.0.rc1)
       activesupport (>= 4.2.0)
     simple_form (4.1.0)
@@ -306,6 +311,7 @@ DEPENDENCIES
   rspec-rails (~> 3.8)
   rubocop (~> 0.60.0)
   sass-rails (~> 5.0)
+  sentry-raven
   shoulda-matchers (= 4.0.0.rc1)
   simple_form (~> 4.1)
   simplecov (~> 0.16)

app/controllers/application_controller.rb

@@ -3,6 +3,8 @@
 class ApplicationController < ActionController::Base
   class NotAuthorizedError < RuntimeError; end
 
+  before_action :set_raven_context
+
   skip_before_action :verify_authenticity_token, if: :json_request?
 
   rescue_from ActiveRecord::RecordNotFound, with: :not_found
@@ -10,6 +12,10 @@ class ApplicationController < ActionController::Base
 
 private
 
+  def set_raven_context
+    Raven.extra_context params: params.to_unsafe_h, url: request.url
+  end
+
   def json_request?
     request.format.json?
   end

config/credentials.yml.enc

@@ -1 +1 @@
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config/initializers/raven.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+# Be sure to restart your server when you modify this file.
+
+Raven.configure do |config|
+  config.dsn = Rails.application.secrets.raven_dsn
+end