Objects On Rails Pdf 11
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Rails also makes it easy to define your own classes. You'll find that as you get more familiar with Rails you'll start to define more complex data structures and use what was previously provided by Rails as a basis for your implementation.
Rails also makes it easy to expose a data structure to a controller. This is where the model object comes in handy. The model object is available to each controller instance and provides the data object that a controller operates on. Remember that a controller is an object with a respond_to method and a controller action is the method that is invoked when a given URL is requested.
That is to say, Rails offers a basic set of data objects and methods that will let you specify a CRUD interface with a database. For example, an Account.create method will let you create a new account and associate it with a user. You can also delete an account, along with the user associated with it. In other words, you can create a CRUD interface with a database.
Later, you'll see how models are a data container, but at the same time, they're also an object that can be programmed. We'll see how to define methods to attach to models, data containers and containers to connect the two.
A common use for models is to represent a user. The user model is a simple data object that will have attributes such as name, email address and phone number. It may also have more complex methods such as confirm_email and confirm_password.
Models are also great for specifying access permissions for objects and methods. For example, when we create an account, we associate it with a user. We can specify that the account method create is only available to a user that belongs to a particular permission group.
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