CRM Data Challenge

You just started a new job. Your boss comes over and says that their CRM (customer-relationship-management) app is too hard to work with, and that you need to do some data transformation. They tell you that you will get a big hash of all the data, and you need to write some code that will take that data and convert it to other data structures more useful to the business.

The original data set has data about people and companies, and about which person works for which companies as well as what their job titles are. The original data looks like this:

CRM = {
  :people => [
    {
      :id => 20,
      :first_name => "Savannah",
      :last_name => "Clementina",
      :employments => []
    },
    {
      :id => 32,
      :first_name => "Elyse",
      :last_name => "Jensen",
      :employments =>
        [
          {
            :company_id => 4,
            :title => "Chief Communications Consultant"
          }
        ]
    }
  ],
  :companies => [
    {
      :id => 0,
      :name => "Nicolas and Sons"
    },
    {
      :id => 1,
      :name => "Mueller LLC"
    },
    {
      :id => 2,
      :name => "Mohr, King and Gleason"
    }
  ]
}

Challenge #1 - employees of companies

Write some code that will return an array of companies, and the people who work for them. For example:

[
  {
    name: "Nicolas and Sons",
    employees: [
      {
        :id => 20,
        :first_name => "Savannah",
        :last_name => "Clementina",
        :title => "Chief Communications Consultant"
      },
      {
        :id => 46,
        :first_name => "Elyse",
        :last_name => "Jensen",
        :title => "Human Directives Engineer"
      },
    ]
  }
]

Challenge #2 - all employments

Write some code that will return an array of all the employments, including the person name, company name, person id, company id and title.

[
  {
    :company_id => 4,
    :company_name => "Nicolas and Sons",
    :person_id => 20,
    :person_first_name => "Savannah",
    :person_last_name => "Clementina",
    :title => "Chief Communications Consultant"
  },
  {
    :company_id => 6,
    :company_name => "Mueller LLC",
    :person_id => 20,
    :person_first_name => "Elyse",
    :person_last_name => "Jensen",
    :title => "Human Directives Engineer"
  },
]

Challenge #3 - people without employments

Write some code that will return an array of all the people who have no employments. The resulting hashes in the array should not include the :employments key.

[
  {
    :id => 20,
    :first_name => "Savannah",
    :last_name => "Clementina"
  },
  {
    :id => 32,
    :first_name => "Elyse",
    :last_name => "Jensen",
  }
]

Test Data

Test data has been provided in the data.rb file.

Process

Write all of this test-first. In your specs, don't use the test data from data.rb - instead, write your own data structures that are similar to the CRM data.

Then, in IRB, run your code against the test data to see it in action.

Bonus

Write a command line tool that will print this data in a pretty way to the terminal.