talum

class InvoicesController < ApplicationController
  def edit
    @invoice = Invoice.find(params[:id])
  end

  def update
    invoice = Invoice.find(params[:id])
    invoice.update!(invoice_params)

    redirect_to invoice

talum

class Invoice < ActiveRecord::Base
  validates_presence_of :amount_due, :due_date, :scheduled_send_date
  validate :closeable_if_unpaid

  def closeable_if_unpaid
    if paid_at.present? && closed_at.present?
      errors.add(:closed_at, "cannot be closed")
    end
  end
end

talum

# db/schema.rb
create_table "invoices", force: :cascade do |t|
  t.datetime   "closed_at"
  t.datetime   "due_date"
  t.datetime   "paid_at"
  t.datetime   "scheduled_send_date"
  t.datetime   "sent_at"
  t.integer    "amount_due"
  t.string     "invoice_type"
end

talum

Microservices Patterns

Chapter 3 Interprocess Communication in a microservice architecture

Intro

IPC (Interprocess Communication)

• REST w/ JSON - the fashionable choice
• Messaging

Considerations

talum

class Lesson < Curriculum
   belongs_to :canonical_material, class_name: CourseWork::CanonicalMaterial
   has_one  :lab, foreign_key: :curriculum_id

  def lab?
    if $rollout.active?(:remove_content)
      canonical_material.lab?
    else
      !!lab
    end

talum

class AssignedRepo < ActiveRecord::Base
  def contents
      if $rollout.active?(:remove_content)
        raise 'Contents called from assigned repo.' # Remove method when removing :remove_content rollout
      else
        return self.none if canonical.nil?

        canonical.contents
      end
    end

talum

class Track < Curriculum
  def labs
    if $rollout.active?(:remove_content)
      CourseWork::CanonicalMaterial
        .joins(:lessons)
        .where(curriculums: {track_id: self.id})
        .where(kind: CourseWork::CanonicalMaterial::LAB_KINDS)
    else
      Lab.where(track_id: self.id)
    end

talum

class Api::V1::SearchesController < ApiController
  def new
    gh_id_mappings = if $rollout.active?(:remove_content)
      GithubRepository.track_data_for_github_repos(repos.pluck(:id), current_user.active_track_id)
    else
      GithubRepository.github_id_mappings_for_global_search(current_user)
    end
    # omitted
  end

talum

# some other caller
def set_projects_progress_status!
  project_repo_ids = AssignedRepo.team_projects_for(batch_id: batch.id, track_id: track.id).pluck(:canonical_id)
end

def set_projects_progress_status!
  project_repo_ids = AssignedRepo.team_projects_for(batch_id: batch.id, track_id: track.id).canonical_github_repository_ids
end

# Assigned Repo

talum

def completed_labs_count(student, canonical_repo_ids)
  if $rollout.active?(:remove_content)
    student.canonical_progresses.complete.
      joins(github_repository: :canonical_material).
      where(github_repository_id: canonical_repo_ids).
      where(kind: CourseWork::CanonicalMaterial::LAB_KINDS).
      uniq(:id).
      count
  else
    student.canonical_progresses.complete.