Download E-books Head First Rails: A Learner's Companion to Ruby on Rails PDF

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By David Griffiths

Ready to move your internet purposes into the internet 2.0 period? Head First Rails takes your programming -- and productiveness -- to the max. you will research every little thing from the basics of Rails scaffolding to development custom-made interactive net apps utilizing Rails' wealthy set of instruments and the MVC framework.

by the point you are comprehensive, you should have realized greater than simply one other net framework. you are going to grasp database interactions, integration with Ajax and XML, wealthy content material, or even dynamic graphing of your information -- all in a fragment of the time it takes to construct an analogous apps with Java, Hypertext Preprocessor, ASP.NET, or Perl. you will even get cozy and conversant in Ruby, the language that underpins Rails. yet you are going to do it within the context of net programming, and never via uninteresting routines similar to "Hello, World!"

a while is far too helpful to waste suffering from new thoughts. utilizing the most recent study in cognitive technological know-how and studying conception to craft a multi-sensory studying adventure, Head First Rails makes use of a visually wealthy layout designed to exploit the way in which your mind relatively works.

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Something’s long gone awry with the shape web page. examine the mistake message that used to be produced and notice should you can determine what went incorrect. you're right here    113 nil potential no worth The @ad shape item has no longer been created the matter is as a result of the @ad item. through default, a variable like @ad is determined to a different price known as nil, this means that no price. If @ad is determined to nil, rather than being set to an advert item, it won’t have attributes like @ad. identify, @ad. description, and so forth. If @ad doesn’t have attributes, does that reason an issue for the shape? You wager! the shape is predicated at the @ad item, and the shape accesses all of the object’s attributes to generate the preliminary values of the fields within the shape. yet once the 1st characteristic is termed, nil is again, and that motives an blunders. So how will we steer clear of this challenge? variable with Rails creates the @ad, or no worth. a default worth of nil r attributes So there are not any otheme. avaialble, like @ad. na @ad = nil

New ad

<% form_for(@ad,: url=>{:action=>'cr eate'}) do |f| percent>

Name
<%= f. text_field :name %>

Description< /b>
<%= f. te xt_area :descripti on %>

Price
<%= f. text_field :p ri ce percent>

Seller<%= f. text_fie ld :seller_id %>Email
/><%= f. text_field :email %>

Img url< br /><%= f. text_f ield :img_url %>

<%= f. publish "C reate" %>

<% finish percent> 114   bankruptcy three The preliminary worth of every of the fields will ac the matching attribucetess on @ad. yet simply because @ad is decided to nil, this motives an mistakes. placing, updating, and deleting the shape item has to be created earlier than the shape is displayed whilst the web page with the shape is generated, the preliminary values of every of the shape fields will come from one of many attributes of the linked item. are you able to imagine what the matter is with that? the matter is that earlier than the shape could be generated, the hot advert item must exist already. in fact, till the consumer completes the main points of the advert, the article will not be stored to the database—but in spite of this, the item has to be created prior to the web page template is named. the shape should be despatched again to the consumer to accomplish the main points of the advert. this can be a newly created advert item - however it will not be kept to the database, the article will merely be used to create the shape. 1 The person requests the ‘new advert’ web page. The values of the ed attributes should be us because the preliminary values of the shape fields. @ad 2 A new clean advert item is created. new. html. erb three  new html. erb generates a kind for the recent advert, that's back to the consumer the place within the program could you create the hot advert item? If it’s a template or technique, what would it not be known as? you're right here    one hundred fifteen new capability new The kinds advert item could be created within the new motion of the controller 1  he varieties advert item has to be created ahead of T the hot. html. erb web page template is administered. in the event you create the item in a controller procedure referred to as new, this may be run earlier than the recent.

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