Ruby on Rails Interview Questions

Try to solve 3 Ruby on Rails interview questions below. Hints can help you find answers to questions you are having trouble with.

1. Contacts Migration

Database migrations

Easy

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

(Select all acceptable answers.)

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

Database abstraction

Easy

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).

(Select all acceptable answers.)

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

HTTP Routing

Easy

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.

(Select all acceptable answers.)

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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