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Ideally, you should be writing tests as you go, never getting too far ahead without testing what you ve written But we decided that explaining how to test would be overwhelming while you were still learning the basics of Ruby and the Rails framework Now that you have a good deal of knowledge under your belt, it s time to tackle testing..

Earlier you read that the base type required for element binding was changed to the DependencyObject class. In addition to this, there are a number of new features regarding data binding in Silverlight 4, three of which I will discuss in this section. All three come in the form of new binding extensions. First I will discuss the string formatting, then I will discuss the extensions TargetNullValue and FallBackValue.

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A key is a way of identifying a record in a database table. We can use keys to build relationships between tables because a key refers to a whole record a property we can exploit when working with columns that, for example, have the same name in different tables. Using a key as a shortcut, we can make the link between the two very easily. Keys can also uniquely identify a record in a table when that is an important part of the database s design. A key can be defined on a single column if that s enough to identify the record, or it can be defined on more than one column if not. The sections that follow introduce the three kinds of keys you can use in a database: primary, foreign/referencing, and candidate/alternate. We ll also look at using a SQL Server method called a constraint instead of a primary key.

Rails defines three different kinds of tests, each designed to test a specific piece of your application: Unit testing tests your models. Functional testing tests your controllers. Integration testing tests at a high level through multiple controllers. Because Rails is an integrated environment, it can make assumptions about the best ways to structure and organize your tests. Rails provides the following: Test directories for unit, functional, and integration tests Fixtures for easily working with database data An environment explicitly created for testing The default Rails skeleton generated by the rails command creates a directory just for testing. If you open it now, you ll see subdirectories for each of the aforementioned test types:

The primary key is probably the most important key type. First and foremost, the column (or columns) on which the primary key is defined must only contain unique values. A primary key cannot be defined on a column, or a sequence of columns, that does not return a single row. To this end, it is not possible to define a primary key for any columns that allow NULL values. A further restraint is that a table may have only one primary key. A primary key can be used to link data from one table to data from another. For instance, in our example database, we have two tables: one holding customers and another holding customer banking transactions. We define a primary key on the customers table on the customer ID that is generated uniquely each time a new customer record is inserted. This is then used to link to the many records within the banking transactions table, to return all the transactions for that customer ID. The link between these two tables is the customer ID, which as previously mentioned is defined as a primary key in the customers table. Later on, you ll see how to join tables together and define a relationship between them. A join and a relationship essentially mean the same thing: a logical link between two or more tables that can be defined through a specific column or set of columns between the tables.

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