xuorig

class ExceptFilter
  def self.call(schema_member, context)
    if schema_member.name == "someField"
      return context[:some_beta_feature]
    end
    
    if schema_member.name == "bankAccount"
      return context[:current_user].hasAccessToBankAccount?
    end
    

xuorig

# Execute a query with an `except` or `only` argument
MySchema.execute(query_string, except: ExceptFilter)

# The except argument here takes any object that responds to call with two arguments:
# schema_member: a member from your schema. It may be a Field, ObjectType, Argument, etc.
# context: The Query Context

class ExceptFilter
  def self.call(schema_member, context)
    # true if field should be excluded, false if it should be included

xuorig

module Graph
  module Types
    Query = GraphQL::ObjectType.define do
      name "Query"
      description "The query root of this schema"

      field :film, Graph::Types::Film do
        argument :id, !types.ID
        resolve ->(_, args, _) { Film.find_by(id: args[:id]) }
      end

xuorig

module Graph
  module Types
    Film = GraphQL::ObjectType.define do
      name "Film"
      description "A single film."

      field :title, !types.String, "The title of this film"
    end
  end
end

xuorig

query {
  firstFilm: film(id: "1") {
    title
  }
  secondFilm: film(id: "2") {
    title
  }
}

xuorig

NewRelic's RPM

Main classes/modules

• NewRelic::Agent
• NewRelic::Agent::Agent
• NewRelic::Agent::EventListener
• NewRelic::Agent::Harvester
• NewRelic::Agent::EventLoop
• NewRelic::Agent::Threading::AgentThread

xuorig

puma/lib/rack/handler/puma.rb

• Defines the handler (takes App and conf as args)
• Sets up a new laucher with conf and events

puma/lib/puma/launcher.rb

• Runs #run, starts the server

puma/lib/puma/single.rb < puma/lib/puma/runner.rb

• Runs #run on the "runner"
• Loads the App @launcher.config.app

xuorig

// Sample ActionCable ES6 client
//
// To be used like:
//
//  const myEventHandlerFunction = (event) => {
//    console.log(event.message);
//  }
//
//  ActionCableClient.connect(
//    'ws://localhost:3000/cable',

xuorig

// PROTOTYPAL INHERITANCE

// In prototypal languages you only have objects. No classes!

// ex nihilo

const object = Object.create(null);

console.log(object);

xuorig

module Mutations
  class MarkPullRequestAsReviewed < Graph::Relay::Mutation
    class Resolver
      class << self
        def call(obj, args, ctx)
          pr = PullRequest.find(args["pullRequestId"])
          pr.update!(reviewed: true)
          { pullRequest: pr }
        end
      end