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The concluding sample for this chapter demonstrates how to support a many-to-many relationship with foreign keys between two pairs of tables The sample many-to-many relationship is between students and classes Therefore, the demonstration application creates tables called Students and Classes These two tables are primary tables Many-to-many relationships require an intermediate table between the two main tables in the relationship In our sample, the intermediate table will be ClassGrades You can build the structure for the many-to-many relationship by using the intermediate table as a secondary table to each of the primary tables The following excerpt from Ch04FKMany-to-manysql shows the CREATE TABLE statements for the two primary tables namely, Students and Classes The Students table has a StudentID column defined with an int data type that serves as the table s primary key The Students table also has a computed column named FullName.

So you see, there is no difference between the methods that Active Record creates and those we define ourselves. Here, instead of just asking the model for one of the attributes garnered from the database column names, we ve defined our own method called long_title, which does a bit more than the standard title method. The methods you add to your models can be as simple as returning true or false, or as complicated as doing major calculations and formatting on the object. The full power of Ruby is in your hands to do with as you please. Don t worry if you don t feel comfortable adding your own methods to models just yet. The important part to note from this first section is that Active Record models are regular Ruby objects that can be augmented, modified, played with, poked, and turned inside out with sufficient Ruby-fu. Knowing this will be extremely helpful in being able to pull back the curtain and understand the advanced features of Active Record.

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A more convenient method that you can use to keep mappings between host names and IP addresses is Sun s NIS, also known as the yellow pages. This system uses a database for important configuration files on a server, such as the /etc/hosts file, the /etc/passwd file, and /etc/shadow. As an administrator, you can determine for yourself what files to manage with NIS. These files are converted to NIS maps, which are the indexed files that compose the NIS database. In NIS, one server is configured as the master server, which maintains the NIS database. All nodes are configured as NIS clients and send their name resolution requests to the NIS master. To provide redundancy, NIS can also use slave servers, which offer a readonly copy of the NIS master database. However, the master server is the single point of administration. Although NIS was a good solution to manage relevant information within a network, it never became very popular as an Internet-level name service mainly because NIS does not provide a hierarchical solution, only flat databases. All of these flat databases are managed by local administrators, and there s no relation among the databases that are used in different NIS domains. The large amount of information on the Internet today makes it impossible to get quick results from a structure like NIS. For this reason, most organizations that still use NIS are phasing it out and configuring DNS to resolve host names to IP addresses, and LDAP to manage user information.

This column is the concatenation of the FirstName and LastName column values with an intervening space The Classes table in Ch04FKMany-to-manysql has the same CREATE TABLE statement as in the preceding sample The primary key for the Classes table is based on the ClassID column CREATE TABLE Students( StudentID int Primary Key, FirstName nvarchar(30), LastName nvarchar(50), FullName AS (FirstName + ' ' + LastName) ) GO CREATE TABLE Classes( ClassID int Primary Key, ClassTitle varchar(50) ) GO The intermediate table, ClassGrades, has three columns and three constraints The three column names are ClassID, StudentID, and GradeLetter The main purpose for the ClassGrades table is to store student grades in classes The rows in the ClassGrades table are unique by the combination of ClassID and StudentID Therefore, the PRIMARY KEY constraint for ClassGrades, PK_ClassGrades, relies on both its ClassID and StudentID column values.

Some people might be made nervous by the long_title method we just created They might see it as a violation of the MVC paradigm They might ask, Isn t formatting code supposed to be in the view In general, the answer is yes However, it often helps to have models that act as intelligent objects If you ask a model for some information about itself, it s natural to assume that it can give you a decent answer that doesn t require a large amount of work later on to figure out what it meant So, small formatted strings and basic data types that faithfully represent the data in the model are good things to have in your code An intelligent model like this is often called fat.

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