jayanthdeejay

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

jayanthdeejay

 work_ids = ActiveFedora::SolrService.query('depositor_ssim:dungavjk@mail.uc.edu AND has_model_ssim:Article', fl: "id", rows: 1000)
   work_ids.each do |work|
      pid = work['id']
      article = Article.find(pid)
      article.depositor = 'konecnmc@ucmail.uc.edu'
      article.edit_users = ['konecnmc@ucmail.uc.edu']
      article.save
      article.file_sets.each do |file|
        file.depositor = 'konecnmc@ucmail.uc.edu'
        file.edit_users = ['konecnmc@ucmail.uc.edu']

jayanthdeejay

worktype = Etd
all_specified_works = worktype.where({:resource_type => 'thesis'}) #the select is something like '{:resource_type => "thesis"}'
col = Collection.find('gps')
col.reindex_extent = Hyrax::Adapters::NestingIndexAdapter::LIMITED_REINDEX
all_specified_works.each do |work|
  if work.member_of_collections.empty?
    work.member_of_collections += [col]
  end
  year = work.date_created[0].split("-")[0]
  if not work.year.present?

jayanthdeejay

irb(main):006:0> local_file = File.open('spec/fixtures/images/world.png') => #<File:spec/fixtures/images/world.png>
irb(main):007:0> local_file = Hydra::Derivatives::IoDecorator.new(local_file)
=> #<File:spec/fixtures/images/world.png>
irb(main):008:0> local_file.mime_type = 'application/foo'
=> "application/foo"
irb(main):009:0> local_file.original_name = 'world.png'
=> "world.png"
irb(main):010:0> Hydra::Works::AddFileToFileSet.call(fs, local_file, :original_file, versioning: false)
Unable to check /var/folders/9t/rygbnddx0b1ckw6tjs3m18qm0000gq/T/20160531-85153-cfleh6 for viruses because no virus scanner is defined
=> #<FileSet id: "ww72bb63r", label: nil, relative_path: nil, import_url: nil, part_of: [], resource_type: [], creator: [], contributor: [], description: [], keyword: [], rights: [], publisher: [], date_created: [], subject: [], language: [], identifier: [], based_near: [], related_url: [], bibliographic_citation: [], source: [], head: [], tail: [], depositor: "jcoyne", title: [], date_uploaded: 

jayanthdeejay

fs = FileSet.find('mp48sc83h')
file_name = 'tmp/uploads/mp/48/sc/83/letz_01_0020_019.tif'
service = Hydra::Works::CharacterizationService.new(fs, file_name, {})

fits_output = service.send(:extract_metadata, file_name)
terms = service.send(:parse_metadata, fits_output)

jayanthdeejay

class Book < ActiveFedora::Base
  include Hydra::Works::Work
end

class Page < ActiveFedora::Base
  include Hydra::Works::Work
end

book = Book.new
page = Page.new

jayanthdeejay

2.2.1 :003 > ActiveFedora::Noid::Service.new.mint
seed is 271030524290525531404955989783767342781
counters size is 293
@rand.rand(counters.size) is 261
counters[261] is {:value=>6300353125, :max=>6324492408}
counters[261][:value] is 6300353125
counters[261][:value] is now 6300353126
 => "vt150j25g" 
2.2.1 :004 > ActiveFedora::Noid::Service.new.mint
seed is 271030524290525531404955989783767342781

jayanthdeejay

# Inspired by https://gist.github.com/3166610
require 'google/api_client'
require 'date'

API_VERSION = 'v3'
CACHED_API_FILE = "analytics-#{API_VERSION}.cache"

# Update these to match your own apps credentials
service_account_email = 'foobar@developer.gserviceaccount.com' # Email of service account
key_file = '/tmp/foobar-privatekey.p12' # File containing your private key

jayanthdeejay

c = Collection.find('d504rk335')
work_ids = []
c.member_objects.each do |member|
  work_ids << member.id
end

new_edit_users = ["user1@example.com", "user2@example.com"]

def change_edit_users(work_ids, new_edit_users)
   work_ids.each do |pid|

jayanthdeejay

# Checks the shasum of each version and current content in old production
# and compares it to those in new production.
#
# To run the report, go to the Rails console and copy-in the two classes in the file.
# Then run:
# 
#   > report = ChecksumReport.new
# 
# The report is an array of hashes, each of which looks like:
#