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To specify conditions, you can pass in a SQL fragment as a string that is sent directly to the query. You need to have a pretty decent knowledge of SQL to use this kind of syntax; but it provides a lot of flexibility, and you can create arbitrarily complex SQL fragments if you re a SQL ninja. Try the same find operation as in the previous section, but using a pure SQL condition fragment: >> Article.where("title = 'Advanced Active Record'") => [#<Article id: 6, title: "Advanced Active Record", >] Let s try something more complicated that only SQL is able to do: >> Article.where("created_at > '23-03-2010' OR body NOT LIKE '%model%'") => [#<Article id: 7, title: "One-to-many associations", >, #<Article id: 8, title: "Associations", >] Instead of using the = sign, you use the greater-than (>) symbol to make sure the date occurs after March 23, 2010. This is followed by the SQL OR operator, which says if this first part isn t a match, then try the right-hand side and give it a second chance at matching. Therefore, you check the right-hand side only if the left-hand side fails. If an item fails the created_at match, you check to see if the body is NOT LIKE code. You can think of OR as a more permissive joining operator. It only cares that one of the conditions is a match. OR has a sister named AND, which requires that both conditions are true: >> Article.where("created_at > '23-03-2010' AND body NOT LIKE '%model%'") => [] You also use the SQL LIKE (modified using NOT, for negation) operator, which allows you to make partial matches. Normally, when using =, SQL requires that the string match perfectly. However, LIKE is

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Rails ships with a few different session storage mechanisms. You can choose to store session data directly on the application server via the file system (the current default), directly in the browser cookies (there is some controversy regarding the security of this approach), or in the database. We like the database approach the best, because it fits well with Rails architectural principles.

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understand, keep going, as most of the new terms and concepts mentioned here are explained as we use them throughout this chapter rails generates the following main folders: app: Contains most of the Ruby source code and output templates directly associated with the application It contains several other folders that I ll cover next app/controllers: Contains the controller files In an empty project, only application_controllerrb (or applicationrb when using Rails 22 or earlier) exists application_controllerrb (or applicationrb) is an application-wide controller where you can define methods that other controllers will inherit app/helpers: Contains helper files Ruby source code files that provide methods that you can use from views app/models: Contains a file for each model in the application In an empty project, no models are yet defined, so this directory is empty app/views: Contains the output templates (views) for the application.

Typically each controller has its own folder under app/views, with templates located in those folders There s also a layouts folder that Rails uses to store generic application-wide templates config: An important folder that contains configuration files for the application databaseyml is a YAML file with information about the database(s) that the application will use environmentrb and bootrb are prebuilt files that you usually won t need to edit, unless you want to tweak fine details of how your application is started routesrb is mentioned later in this chapter in the section Creating a New Action and View db: A folder to be used for database dumps, backups, and migrations doc: Contains any RDoc documentation generated for the application.

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