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ClassID ----------1 999

Association proxy is a fancy term for the ability to chain together multiple calls to Active Record. We ve been using this technique throughout the entire book, but haven t given it any special mention. Here is a basic example of association proxies:

The generic syntax of the lines that you can include in the /etc/hosts.allow and /etc/hosts.deny files is not hard to understand: daemon:host[:option : option ...] Of these, daemon is the process involved, host is the list of hosts that you want to allow or deny access to, and option is a list of options you want to include. Note that, instead of referring to a specific host or daemon, some generic keywords can be used as well. Table 9-2 summarizes these TCP Wrapper keywords. Table 9-2. TCP Wrapper Keywords

ClassID ----------1 2 999

Event.find(:first).registrations.find(:all)

ClassTitle -------------------------------------Learning SQL Server Express Learning Visual Basic Express for DBAs Biographies of Jesus Christ

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Refers to all daemons or all hosts. Note that you can define an exception to ALL by using the keyword EXCEPT. This option can be used for host names only and refers to all host names that do not have a dot in their name. All host names for which tcpd cannot identify the name. All host names that could be identified by their name and matching IP address. All hosts for which the host name does not match the given IP address.

When you are working with a view that connects two tables in a one-to-many relationship, you can generally insert new rows into the table on the one-side of the relationship through a view. The preceding example worked because the new row of class values was for the table on the one-side of the relationship. The next attempt to insert a row tries to add a new set of column values for a table on the many-side of a relationship, but fails. I ll then diagnose the problem and show you a remedial action.

This will return all of the registrations for the first event returned. The second find (off registrations), will be automatically scoped to the event, which is to say, it will find registrations that belong to that event. If you remember, registrations is a has_many relationship on the Event model. The cool part is that this isn t two queries to the database. It does all of this in one request to the database. Scoped finders are also more secure. Imagine a multiple-user system where data owned by one user shouldn t be accessible by another user. Simply finding an associated object, say, a document, by its id wouldn t restrict it to documents owned by a particular

Let s start with the example shown in Listing 9-18. Listing 9-18. Simple Example of /etc/hosts.allow and /etc/hosts.deny RNA: ~ # cat /etc/hosts.allow ALL: LOCAL RNA: ~ # cat /etc/hosts.deny famd, netstatd, ps: ALL

When an attempt to insert a new row through a view fails, you can sometimes succeed by simplifying the process. If a view interprets your T-SQL statement as attempting to insert into two tables concurrently, rewrite the INSERT statement. For example, insert into just one table on the many-side of a relationship. Alternatively, write two separate INSERT statements that each add a row into a different table.

user. You could pass in the document_id and the user_id as conditions, but that s sloppy and error-prone. The correct way to do this would be to scope all find operations off the user in question. For example, assuming you had a User object stored in the variable current_user, current_user.documents.find(1) would ensure that the document with id 1 would be returned only if it belonged to the current_user. Anyone who has done database work will realize that this incredibly simple syntax is far easier than the SQL queries that need to be created to achieve similar results. If you play around with these chains, you can check out the log to see the SQL that was generated you ll be happy that you didn t have to write that yourself! This technique doesn t just apply to finding. It can be used to automatically assign ownership with build and create constructors by setting the appropriate foreign keys. Consider the following example where we re creating a new document for the current_user. This will automatically set the document s user_id to that of the current user.

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