By A P Rajshekhar

Learn how to create dynamic web content with Ruby on Rails. This publication is for a person who has uncomplicated strategies of object-oriented programming in addition to relational databases and desires to advance on-line purposes utilizing Ruby on Rails. earlier wisdom of Ruby or Rails isn't anticipated.

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That's how iterators and blocks work together. [ 36 ] Chapter 2 Exception Handling Exceptions are error conditions that interrupt the normal execution of a program. Exceptions can occur due to many reasons including I/O errors and trying to divide by zero. It is always a good practice to handle exceptions. To handle exceptions, Ruby provides the raise and rescue clauses. Every block containing a logic that can give raise exceptions is kept inside a begin/end block as shown below begin #logic rescue #handle error condition end For example, to catch all the exceptions that can occur within a block, you will have to write: begin #logic rescue Exception #handle error condition end Let's say that in the read_from_file method of the Tale class, while opening the file, an exception can occur.

By using Layout API, you can pass the content of the body without providing the header or body multiple times. Using this technique, you can even provide user-specific body content for a page. [ 42 ] Chapter 2 A basic RHTML template can be created either by hand or through a command. The command is closely linked with the Controller component. We will look at it in the next section. Let's have a view of an RHTML file. As you already know, RHTML is an HTML file having embedded Ruby code. Let's say that you want to display a set of combo boxes, one each for day, month, and date, then the RHTML file will contain: Select Date

Please select the date of the publication of the Tale

date_select("post", "written_on", :start_year => 1855) You will see the details of this helper and many other such helpers in the coming chapters.

Logging, user authentication and providing personalized response based on user are examples of such situations. To handle these situations, the Action Controller provides filters. There are three main filters—before, after, and around. These filters work as their name suggests. The before filter is executed before the logic within the Controller is executed. The after filter is called once the Controller logic is executed. And the around filter is a combination of the before and after filters. They wrap around the complete logic.

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