Ruby on Rails Interview Questions

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1. Contacts Migration

Ruby on Rails Database migrations Public

Select all statements that are correct after the following migration has been executed:

class ContactsMigration < ActiveRecord::Migration
  def change
    create_table :contacts do |t|
      t.string :name
      t.integer :telephone_number
      t.text :address, null: false
      t.timestamps
    end
  end
end

(multiple correct answers possible)

Difficulty

Easy

Time

3min

The contacts.name field may be null.

The contacts table has no index.

The table called contacts contains four different data types.

The table called contacts contains four different fields.

The contacts.address field may be null.

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2. Employee Search

Ruby on Rails Database abstraction Public

A company database contains the following table, in which id is the primary key:

employees

id	name	age
1	Steve	21
2	John	44
3	Amy	26
4	Marcus	44

Select all the statements that return only the employee with name "John" (id = 2).

(multiple correct answers possible)

Difficulty

Easy

Time

3min

Employee.find("John")

Employee.find_by(name: "John")

Employee.where(name: "John").first

Employee.where("age > 30")

Employee.not.where(name: ["Steve", "Amy", "Marcus"])

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3. Record Route

Ruby on Rails Routing Public New

Consider the following controller and view definitions:

class RecordsController < ApplicationController
  def update
    @record = Record.find(params[:id])
    @record.update(record_params)
  end
end

<%= form_for @record do |f| %>
<%= render 'form', f: f %>
<% end %>

Select the statements that can be used to update a record.

(multiple correct answers possible)

Difficulty

Easy

Time

3min

write '/records/:id', to: 'records#update'

put '/records/:id', to: 'records#update'

patch '/records/:id', to: 'records#update'

post '/records/:id', to: 'records#update'

resource :records, only: [:update]

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