Exception-Handhabung

begin
  user = Post.find(1)
rescue RecordNotFound => e
  render :text => "Could not find post", :status => 404
end

class ApplicationController < ActionController::Base
  rescue_from ActiveRecord::RecordNotFound, :with => :record_not_found

  private

  def record_not_found
    render :text => "404: Resource not found", :status => 404
  end
end

begin
  # Some code that raises an exception
rescue => error
  Appsignal.report_error(error)
  puts "Exiting. An error occurred: #{error}"
  exit 1
end

begin
  # some code
rescue => error
  Appsignal.report_error(error) do
    Appsignal.set_namespace("admin")
    Appsignal.set_action("MyCustomAction#perform")
    Appsignal.add_params(:param1 => "value1", :param2 => "value2")
    Appsignal.add_tags(:tag1 => "value1", :tag2 => "value2")
    Appsignal.add_custom_data(
      :i18n => {
        :locale => "en_GB",
        :default_locale => "en_US"
      }
    )
  end
end

def index
  # This tag is added to all exceptions
  Appsignal.add_tags(:some_tag_for_all_errors => true)

  begin
    raise "something went wrong"
  rescue => error
    # Report the first exception
    Appsignal.report_error(error) do
      # This tag is only added to the first exception
      Appsignal.add_tags(:some_tag => true)
    end
  end

  begin
    raise "something else went wrong"
  rescue => error
    # Report the second exception
    Appsignal.report_error(error) do
      # This tag is only added to the second exception
      Appsignal.add_tags(:other_tag => true)
    end
  end

  # This tag is added to all exceptions
  Appsignal.add_tags(:another_tag_for_all_errors => true)
end

# some_script.rb
require "appsignal"

Appsignal.start

raise "I will crash the process!"

require "yaml"
class SomeClass
  def call
    YAML.load(File.read("config.yml"))
  rescue SystemCallError => exception
    Appsignal.set_error(exception)
    puts "No config file found. Using defaults."
  end
end

require "yaml"

Appsignal.monitor :action => "My action" do
  begin
    YAML.load(File.read("config.yml"))
  rescue SystemCallError => exception
    Appsignal.set_error(exception)
    puts "No config file found. Using defaults."
  end
end

begin
  # some code
rescue => e
  Appsignal.send_error(e)
end

begin
  # some code
rescue => e
  Appsignal.send_error(e) do |transaction|
    transaction.set_action("my_action")
    transaction.set_namespace("my_namespace")
    transaction.params = { :time => Time.now.utc }
  end
end

require "rake"
require "appsignal"

task :fail do
  Appsignal.listen_for_error do
    raise "I am an exception in a Rake task"
  end
end