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返回到 Rails 的 Active Record 与 Action Pack

學生對 约翰霍普金斯大学 提供的 Rails 的 Active Record 与 Action Pack 的評價和反饋

768 個評分
163 條評論


You already know how to build a basic web application with the Ruby on Rails framework. Perhaps, you have even taken Course 1, "Ruby on Rails: An Introduction" (we highly recommend it) where you relied on external web services to be your “data layer”. But in the back of your mind, you always knew that there would come a time when you would need to roll up your sleeves and learn SQL to be able to interact with your own relational database (RDBMS). But there is an easier way to get started with SQL using the Active Record Object/Relational (ORM) framework. In this course, we will be able to use the Ruby language and the Active Record ORM framework to automate interactions with the database to quickly build the application we want. In Rails with Active Record and Action Pack, we will explore how to interact with relational databases by using Active Record, a Ruby gem, which Rails uses by default for database access. We will then take a look at what role Active Record plays in the overall request-response cycle, when a client (the browser) requests data from the server, as well as how to submit the data to the server. Of course, when accessing data, security is of paramount importance! We will talk about vulnerabilities such as SQL injection, as well as how to secure access to data by authenticating and authorizing users accessing the data. Take this course to build a Ruby on Rails application with Active Record to automate the detailed SQL interactions with our database....



A nice continuation to course 1 of this specialization, deeper dive into RoR, among other things you will learn how to manipulate/display database data and how to authenticate/authorize users!


Great explanation of not so easy to understand concepts. Lecturer provides good example that can help material better and see how what you've learned can be applied to real world scenarios.


126 - Rails 的 Active Record 与 Action Pack 的 150 個評論(共 156 個)

創建者 Tichaona B N


Great course. It open ed up my eyes to how simple it can be to generate a workable MVC web application without having to dive too deep into the working of the application,

創建者 Qun X L


Learn a lot of new knowledge from this course. knowledge points clear, assignment workload OK. This is the good place to learn Active Record and Action Pack.

創建者 Daichi Y


It was an awesome course! There is just one thing; the versions of Ruby and Ruby on Rails look to be a bit out-dated. Thank you!

創建者 Giorgio P F G T


Very good course.

The professor explains a lot from the framework and other concepts of web development.

Very worth it!!

創建者 Matthew H


Quick and easy to understand lectures. I was able to pick up active record and action pack quickly!

創建者 Ciré D


Very nice one. may be not the one for a beginner but help to gain some basics

創建者 Laura R P


Good overview, though sometimes hard to follow if you're a complete newbie

創建者 Assain J


It's a nice course, learnt stuff about rails that I didn't earlier.

創建者 Nikola Đ


Good course overall, wish more topics were covered but it's OK.

創建者 Ronak Y P


Great Course, Great assignments and pace. Loved it.

創建者 Raul C M


Great course to get you started into ruby on rails

創建者 Piotr


Useful course for beginners to Rails world.

創建者 Vinay J


Seems tough...though interesting !!

創建者 Joaquin A


Digging deeper into Active Record.

創建者 Haseeb A



創建者 Joseph C


The assignments took me much longer than the suggested 3 hours. Every task depends on having completed the previous task perfectly. My assignment in week 4 passed the end to end test perfectly on my local computer but failed the grader. I traced the problem back to a tiny typo that I made in week 2 assignment. (My heart sank when I saw I had to reuse my week 2 work in week 4 as I knew how much messing around I had done to get that one through the grader - I knew it would give problems)

As there were a couple of mistakes in the course (for example if you follow the steps in assignment 3 correctly then the final rspec would give failures - obviously this wasn't picked up by lecturers) it creates confusion and doubt as to whether you have made the mistake or the tutors.

The course content is good but the assignments need to be shorter and more forgiving of mistakes (i.e make the individual tasks independent of one another and pass if you get 80%). I am not sure if I will continue with the specialisation right now. It seems more suited to someone who is studying full time and not someone who is working who has limited spare time.

創建者 Ashvith S


Needs to be improved. I do accept the fact that I cram-completed the course , which is not a nice way to go , because any form of learning , if it exceeds more than 3 hours a day , will hurt your head , and drop the productivity .

I think that comparing to the first course and the fourth course of this specialization , I can say for sure that this is not as enjoyable as the other two. It has a lot to do with data base , visualization inside your brain , and , yes , quite hard to digest for a beginner.

創建者 Christiane H


Great course although I did struggle through the very last assignment. The first three were relatively ok, considering I'm new at this but they did take me longer than 3 hours to complete. The last one took about 3 days!

That being said, if the rspec tests weren't being run in dev mode, it might have been quicker. I had to move "ENV['RAILS_ENV'] ||= 'test'" from rails_helper.rb to spec_helper.rb to get stuff working.

Without my ruby on rails hubby, I'd have been lost!

創建者 Xuliang S


Course staff does not respond to questions that I posted on the forum.

創建者 Matías M


Good homework and good examples.

創建者 Vitalij


It was difficult to follow, because of all the screenshots without live programming. I think it would be more easier to understand if the course wouldn't consist only of pics.

創建者 Takayuki K


This course was tough.

The content of lectures are great but autograder of assignments is too bad. It was very stressful for me to use autograder till I can get used to it.

創建者 Dmitri B


Really needs updating.

創建者 Dan P


Totally unimpressed. Video lectures are terrible. Explanations are at best incomplete, usually confusing, sometimes incoherent. Instructor never gives an overview of the architecture/data flow/structure of Active Record or Action Pack, instead describes the syntax of a handful of functions. As a result you only get the most superficial understanding of the material. The graded assignments are just a regurgitation of the lectures and so don't require you to take a deeper dive into the material. In fact, in many cases the answers to the graded assignments are listed in the assignment immediately following the question.

創建者 bhupesh


Content of the course is great! But if you get stuck in a problem no one responds or guides you. For practice purpose just take the free version, paid version is not worth taking, as you will not get any additional guidance or support to do assignments when stuck.