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
Database migrations
Database migrations are an unavoidable part of continuous software development and integration, and every developer should be familiar with them.
Easy
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.
2. Employee Search
Database abstraction
Database abstraction
Database abstraction decouples business logic from a database, making it a key component of many web frameworks.
Easy
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"])
3. Record Route
HTTP Routing
HTTP Routing
Routing describes the method of creating and directing a response for a given request (typically a URL).
Easy
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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