先进的ruby on rails模型和验证

Question

In general, I have a website which needs to have complex registration process. And in that registration process I need to include 4 tables from database.

Now... I cannot validate one by one model and to enter 4 of them in database. Is there a way to make common points of all those tables in one model?

Let's say: User model has columns: username, name , etc. Package model has: type, account_number etc

And in registration process I need to include username, name, account_number and to validate them. How to do that?

Answer 1

Without seeing your model structure, this is just speculation, but here goes:

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Virtual Attributes

In your User model, you can use attr_accessor to create a set of virtual attributes - which basically mean you can create a series of setter / getter methods in your User model.

Although I don't think this will help you directly, it should give you an idea as to how you can create single-model validation:

#app/models/user.rb
Class User < ActiveRecord::Base
    attr_accessor :new, :values, :to, :validate
    validates, :new, :values, :to, :validate, presence: true
end

This will allow you to create the attributes in the User model - and although they won't be saved, you can then use them to validate against

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attr_accessor

To give you a quick overview of this method, you first need to remember that Rails is just a collection of modules and classes .

This means that every model you load is just a class which has been populated with a series of getter / setter methods. These methods are defined by ActiveRecord from your data table columns, and are why you can call @user.attribute

The magic is that if you use attr_accessor , you'll basically create your own attributes in your User model - which won't be saved in the database, but will be treated like the other attributes your objects have, allowing you to validate them

Answer 2

Because your registration process seems to be complex, I would go even futher as virtual attributes and use Form Objects

7 Patterns to Refactor Fat ActiveRecord Models

LA Ruby Conference 2013 Refactoring Fat Models

ActiveModel Form Objects

Answer 3

I understand that you multistep registration. You shouldn't create 4 models only because your view pages needs it. You should:

1. remove validation from User model and add validation on each form
2. create 4 different forms (for example extends by ActiveModel or user gem reform )
3. add validation to each form
4. after form.valid? save part of user info to @user object

Thats all.