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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The RadRails IDE looks good fleshed out. It presents many helpful aids to the Ruby on Rails programmer. The e-book indicates a variety of examples and display captures.
Plus, there also are a few accelerators. Like code templates. this allows you to outline snippets of typical code. Then through a couple of keys, a snippet should be inserted at a situation contained in the major code. notwithstanding, come to think about it, you need to most likely minimise utilization of this selection. simply because if overused it may well bring about many code duplicates, which raises the dimensions of the final code, and makes upkeep more durable, if you would like to make an identical switch to all circumstances of a given snippet.
RadRails additionally offers aid for a debugger. Making it effortless to invoke. this selection is definitely worthy cautious analyzing.
I locate that HTML, XHTML & CSS for Dummies is of an analogous caliber (and quirkiness) because the different "for Dummies" books. this can be a nice table reference ebook for newcomers or those who do not code web content usually. i might suggest this ebook as a reference / part buy to precise net coding tutorial books.
Create, customise, and set up your own social networking web site with Elgg An up to date model of the first actual ebook on Elgg distinct and easy-to-understand research on construction your personal social networking website with Elgg discover the mammoth variety of Elgg's social networking functions together with groups, sharing, profiles and relationships discover ways to create plugins and issues with huge tutorials Written by way of funds Costello, a middle developer of the Elgg group, with a foreword from Dave Tosh, Elgg co-founder.
Benefit from Sinatra, the Ruby-based internet program library and domain-specific language utilized by GitHub, LinkedIn, Engine backyard, and different well known agencies. With this concise publication, you'll fast achieve operating wisdom of Sinatra and its minimalist method of construction either standalone and modular net functions.
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Additional resources for Building Dynamic Web 2.0 Websites with Ruby on Rails: Create database-driven dynamic websites with this open-source web application framework
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:
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.