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However, let s imagine that you have a User model that contains columns including a user s name, e-mail address, and other user-related information Now let s imagine that you directly relate users and entries within your application You might expect to be able to do things like this: entry = Entryfind(1) entryusername = 'Name of whoever posted the entry' entryuseremail = 'Their e-mail address' This is, indeed, what one-to-many relationships with ActiveRecord enable Setting up such a relationship between models is easy Consider the two models, located in app/models/entryrb and app/models/userrb, respectively: class Entry < ActiveRecord::Base belongs_to :user end You would use this code for the User model: class User < ActiveRecord::Base has_many :entries end ActiveRecord was designed to allow an almost natural language mechanism of defining model relationships In our Entry model, we say that Entry objects belong_to User objects.

The third version connected to the company Microsoft Exchange server and allowed you to e-mail insults to others in the company My manager was very happy to see how and what I was going to do to learn the technology All your manager really cares about is being able to tell his boss what you're doing day to day If you give your manager that information, you'll be his favorite employee When I had my first encounter with NET, I simply dusted off the Insulter idea, and it became Insulter NET! I'll have more to say about what skills and knowledge are critical for developers to have in the section "Prerequisites to Debugging" later in this chapter Common Debugging Question: Should we do code reviews Absolutely! Unfortunately, many companies go about them in completely the wrong way.

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One company I worked for required formal code reviews that were straight out of one of those only-in-fantasyland software engineering textbooks I had in college Everything was role-based: there was a Recorder for recording comments, a Secretary for keeping the meeting moving, a Door Keeper to open the door, a Leader to suck oxygen, and so on All that you really had, however, were 40 people in a room, none of whom had read the code It was a huge waste of time The kind of code reviews I like are the one-on-one informal kind You simply sit down with a printout of the code and read it line by line with the developer As you read it, you're 9.

In the User model, we say that a User object has_many associated Entry objects The only thing you need to set up, other than the relationship itself, is a column in the entries table that enables the relationship to work You need to store the id of the associated user with each Entry object, so you need to add an integer column to entries called user_id You could do this by creating a new migration and using a directive such as add_column :entries, :user_id, :integer or by adding the column manually with SQL (through another client) Once the model relationship has been defined and relationships between data have been made which is as easy as, say, entryuser = Userfind(1) you can then access data across the relationship For example, in a view showing an entry, you might have some view code such as this: <p>Posted by <%= entry.

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username %> at <%= entrycreated_at %></p> ActiveRecord also supports many-to-many relationships For example, consider the relationship between fictional Student and Class models Students can be associated with more than one class at a time, and each class can contain many students With ActiveRecord, you can define these relationships using a join table and a has_and_belongs_to_many relationship, or through an intermediary model such as Enrollment, which defines the links between Students and Classes using has_many with a :through parameter..

FIGURE 7-4 Execution plan for the query in Listing 7-4

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