I have two models, Listing and Profile, configured with Active Admin. I want to create a system in which for each new listing, a profile is automatically created and linked. How should I approach this?
I had a similar need, I had a User created by devise and wanted to attach exactly one Profile when the user was created. I set up the relationships has_one and then created and after_create callback on my user object…after_create :create_profileprivatedef create_profileProfile.create(user: self)endworked like a champ.
Why choose Ruby on Rails?
Hello,Rails is a server-side web application framework written in Ruby under the Licence. It's a model view controller framework which providing default structure for a database, web service and web pages.Rails combine the Ruby programming language with HTML, CSS, and JavaScript to create a web application.There are many reasons to choose ruby on rails for the web and mobile applications:- Ruby On Rails development is flexible which makes frequent modifications possible.- It enables one to see what have been done exactly on a particular project.- Ruby On Rails is an open source with huge community support.- Unless COBOL is being used, ROR is very closer to English.- It saves money and time.For more details, you can check here: Why choose ruby on rails development for your web and mobile applications? or you can also contact us at sales@gmail.com
Why did David Heinemeier Hansson choose Ruby (over Python?) to build Rails?
Why do people fall in love? You can break it down to high cheek bones or shared interests or a dangerous date or any other parts of the puzzle, but it’ll in large parts remain a puzzle. Not because you don’t know what the pieces are, but because you can’t foresee the way they’ll fit together for you.That’s Ruby for me. I’m in love with Ruby and has been for the past 14 years. I could pull out the blocks, the aliased-for-the-perfect-occasion keywords, the open core classes, the consistency of the OOP while accommodating the peaches of procedural and functional programming. But these are all pieces, and many other languages share some of the pieces put together in different ways. Yet Ruby is the one I love.I’m sure plenty of programmers will find so vague, emotional language silly if not downright annoying. There’s a large class of programmers who think that because we occasionally intersect with a field that has the word science in it, that we’re supposed to be these rational automatrons that just pick the objectively BEST TOOL FOR THE JOB.I think that’s a bag of bollocks. There are no BEST TOOLS. There are only puzzles that tickle your brain just right. Almost everything today can be made to make anything. That’s glorious. Viva diversity of expression, language, and thought.
Why are so many data scientists using Python over Ruby? Is Python really better than Ruby in this respect?
Disclaimer: I don't have any scientific data to back my claims. That said, based entirely on my experience, I see some reasons:Python has a solid set of libraries for data manipulation and scientific stuff in general, which are mature and trusted such as NumPy.Python is a little older, and people that come from an academic background tend to be more conservative about their tools of choice. (Some people still use FORTRAN for some tasks, which says a lot about it).There's little reason to reinvent the wheel. Pure vector manipulation is still done in FORTRAN for this reason (but NumPy got more and more used over the past 10+ years since its introduction). And Python started to be used for this some time ago, before Ruby spread in the community.Python seems to have a much bigger following in the academy than Ruby. As a matter of fact, Python was born in the academic scene, as a direct result of experiments to introduce programming concepts to children, before it took off as a generic programming language. That kind of mindset is usually self-reinforcing (Python is popular in the academy, academics use Python because it's popular there, and so on).It's possible that Ruby may develop over time to be as popular or more than Python is today for this application. But for this to happen some big names have to come up and contribute something as massive and significative as NumPy or SciPy, and that will take a lot of time and effort (as it did for Python).
Why are people using underscore references to model attributes in Rails?
It's impossible to say without seeing the code, but if you can't find it anywhere in the codebase, it has to be in the database. However, that would imply that first_name is a method that overloads one of the existing Ruby classes, as anything coming from a database can't have a type that, by default, has a method called first_name().It's possible that author_info were a serialised database field, but even if that's practical, its values would be accessed via [] notation, not using methods.A much more likely answer is that there's a method or an association on @author's class (is it User?), which you're missing. It's likely that there's another model called AuthorInfo, and a User has_one :author_info. And then, an AuthorInfo has a column called first_name.Lastly, if you're definitely sure neither of the above is the case, it could be that author_info is a dynamically created method, for instance with a mechanism like this:['author', 'reader'].each do |role| define_method("#{role}_info") do |param| self.send("#{role}_information") endendor something along those lines.
How do I pass a Ruby variable to JavaScript?
checkout this link. Stackoverflow