Chapter 7

Question 1

rails command for running test suite

Answer 1

$ bundle exec rake test

Question 2

rails command for starting a console session where session commands are rolled back at end of session.

Answer 2

$ rails console –sandbox

Question 3

$ rails generate model User name:string email:string

What does name:string do in this command?

Answer 3

in the migration file that this command generates, the migration will have functions which add a Name row to the db table. Entries in this row will be string objects.

Question 4

How would you run the rails server in a different environment?

Answer 4

$ rails server –environment production

$ rails s –environment test

Question 5

What are the three Rails environments?

Answer 5

development, test, and production

Question 6

If you view your app running in production, it won’t work without a production database, which we can create by running rake db:migrate in production:
what is the rails command for that?

Answer 6

$ bundle exec rake db:migrate RAILS_ENV=production

Question 7

Command for displaying a gems location.

Answer 7

$ bundle show [gem]

Question 8

HTTP’s four fundamental operations

Answer 8

POST, GET, PATCH, DELETE

Question 9

method for changing a resource’s attributes

Answer 9

update_attributes

Question 10

command for resetting the database, aka wiping out all entries

Answer 10

$ bundle exec rake db:migrate:reset

Question 11

ORM

stands for

Answer 11

Object Relational Mapper

Question 12

Initializing an object with a hash as an argument is called:

Answer 12

Mass assignment

Question 13

user.errors.count

what will the #count method do?

Answer 13

return the number of errors

Question 14

Jargon word for temporary message that displays on web page

Answer 14

flash

Question 15

rails method for constructing a form

Answer 15

form_for

Question 16

command for showing list of all routes

Answer 16

$ rake routes

Question 17

command for running a single test

Answer 17

$ rake test TEST=[path/file]

Question 18

variant of flash method for displaying flash message on rendered pages

Answer 18

flash.now

Question 19

method for storing a cookie in client until client browser closes

Answer 19

session

Question 20

||=

what is this operator called?

Answer 20

the “or equals” operator
var ||= ‘Hi’
var is set to ‘Hi’ only if var is nil

Question 21

$ bundle exec rake test TEST=test/integration/users_login_test.rb \
> TESTOPTS=”–name test_login_with_valid_information”
________
What does this command do?

Answer 21

runs a specific single test “test_login_with_valid_information” within a specific file “users_login_test.rb”

Question 22

session.delete(:user_id)
_______
what does this accomplish?

Answer 22

This method is used to log a user out, to remove the cookie, ending the “session.”

Question 23

what is a migration?

Answer 23

a migration modifies a database to add or remove tables, columns, or entries

Question 24

$ rails generate migration add_remember_digest_to_users remember_digest:string
_______
what files will this command generate, and what will the files do?

Answer 24

creates a migration ruby file which adds the column remember_digest to a users table.

Question 25

the cookies method takes two arguments; what are they?

Answer 25

1: a value, 2: an optional expiration date