Ruby on rails relationship find

Active Record Associations | The Odin Project

ruby on rails relationship find

Given User has_many:articles in Ruby on Rails you can write something like: You see Rails will not trigger SQL after every chain definition. Understanding the basics of Ruby on Rails: SQL Databases and how they work Store data in an organized and structured way, so we can get it easily. Should I store all Let's understand how the tables' relationships work. Find by id - This can either be a specific id (1), a list of ids (1, 5, 6), or an array of ids ([5, 6, 10]). If one or more records can not be found for.

Ruby is a scripting language and Rails is a web application framework written in Ruby.

Understanding the basics of Ruby on Rails: SQL Databases and how they work

PHP codes can be easily run on server and deployed. To maintain the code, some standard needs to be followed. When it comes to frameworks, the benefit of PHP is that, it has more number of frameworks compared to Ruby. You can find more PHP developers compared to Ruby on Rails, which is really helpful for the companies or developers who need to learn the language. Frameworks Rails — The more you work on this framework, the more you will gain.

It helps in providing quality products in less time when compared to PHP. Rails is a stable framework so companies and developers can easily adjust to it by learning one single framework, whereas for PHP there are a lot of frameworks which may make learning confusion.

There are also no surety whether all the PHP frameworks will be supported in future or not.

Understanding the basics of Ruby on Rails: SQL Databases and how they work

Development Rails is a well-engineered framework where most of the necessary things are automated so that developer can just focus on business related work. The points where PHP lacks are: Scaffolding — Generating a code in an easy and straightforward way, helps in faster development, whereas PHP lacks in this regard.

Gems — Rails provides plugins as a gem. Just add in your application and it fastens your development.


Testing Rails has testing frameworks that can be used to test your code and provide bug free code and make the client happy, where PHP framework are still trying to get this feature. PHPUnit is one such example. Since, PHP is easier to learn and implement, it has more developers and so because of resources vs demand scale, it is cheaper to get your website developed in PHP as compared to Ruby on Rails.

  • Rails ActiveRecord Relation (Arel), composition and Query Objects
  • first_or_create
  • Ruby on Rails

Conclusion PHP has very large developer pool, it is easy to learn, has too many framework to choose, can find easy solution with the availability of experienced developers and is affordable.

Ruby on Rails has passionate community, is always introducing new changes, application will be quick to market and best suits for agile development.

ruby on rails relationship find

This association indicates that the declaring model can be matched with one instance of another model by proceeding through a third model. For example, if each supplier has one account, and each account is associated with one account history, then the supplier model could look like this: For example, if your application includes assemblies and parts, with each assembly having many parts and each part appearing in many assemblies, you could declare the models this way: How do you know which is which?

For example, it makes more sense to say that a supplier owns an account than that an account owns a supplier. This suggests that the correct relationships are like this: In current versions of Rails, you can abstract away this implementation detail by using t.

Rails offers two different ways to declare a many-to-many relationship between models.

ruby on rails relationship find

This makes the association indirectly, through a join model: With polymorphic associations, a model can belong to more than one other model, on a single association. For example, you might have a picture model that belongs to either an employee model or a product model.

Here's how this could be declared: You can do same things you would normally do with scopes.

ruby on rails relationship find

Many would say that Rails is well tested all we need to test if correct scopes are called in order and they will write test like this: Well honestly you are doing the similar mistake just slowing down your test suite. Well if your controller index action has 50 different scenarios and for each controller action test you need to create 10 to 20 records just to prove if they pass, even with medium size project your test suite will run 20min - 60min.

We are missing one level of abstraction. Now you may be against this and say that implementing such a Query Interface for every simple controller is a waste of effort if you have just single scope or single Query object in your controller.

ruby on rails relationship find

Well yes it is, sort of. Usually first I write test for every query object or Rails model scope I write similar let!

But when the day comes I extract out valuable parts of the tests to query interface test and throw the original test away.

ruby on rails relationship find