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Where I used to do this:
Foo.find_by_bar('a-value') I can now do this:
Foo.where(:bar => 'a-value').limit(1).first Is this recommended? Is this the best way? Should I continue to use the "old" way because it continues to be useful syntactic sugar, or is there an Even Better way I can do that now, which will support chaining and all the other good stuff?
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Active Record allows you to validate the state of a model before it gets written into the database. There are several methods that you can use to check your models and validate that an attribute value is not empty, is unique and not already in the database, follows a specific format, and many more.
ActiveRecord is an ORM. It's a layer of Ruby code that runs between your database and your logic code. When you need to make changes to the database, you'll write Ruby code, and then run "migrations" which makes the actual changes to the database.
The Relation Class. Having queries return an ActiveRecord::Relation object allows us to chain queries together and this Relation class is at the heart of the new query syntax. Let's take a look at this class by searching through the ActiveRecord source code for a file called relation.
ActiveRecord::Base indicates that the ActiveRecord class or module has a static inner class called Base that you're extending.
Rails 4 :
Foo.find_by bar: 'a_value' , wibble: 'a wibble value' If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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