How to implement dependent dropdowns in Rails 4 with an unobtrusive jQuery script

I recently had to implement a view with the classic search form with two select dependent on each other. My aim was to leave the page as clean as possible and make the code that loads the options for the daughter dropdown reusable.Suppose, therefore, to have two models, SpecializationType and Specialization, defined as follows:1234567891011121314151617181920212223242526272...

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Tips: Multiple pagination with will_paginate

Will Paginate is a great and widely used gem for pagination in Ruby on Rails.Sometimes you need to paginate multiple list on the same page.This tip show you how to put a list of paginated products and a list of of paginated services on the same page with will_paginate. The key point is to use a custom param param_name in the view and also in the controllerThe view code is something like this:123# ....

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Two step signup with Devise

[** UPDATE: 21/01/2013 **]: Thanks to Kevin Triplett now there's a Devise wiki page referencing this post and combining the comments. Please check this wiki page, especially if you’re using Rails 3 and Devise 2: https://github.com/plataformatec/devise/wiki/How-To:-Email-only-sign-up On my Ruby on...

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Prevent registration of reserved login

Every time you create a web application where users can register, it is good to exclude some login or username so that they can not be used. A classic example is the login "admin". I believe that no one wishes that in its application will be a registered user with the username ...

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Ruby Enumerables: Operation on hashes

In my last post I talked about Ruby's hash. Today I will resume and complete the argument by describing some of the things you can do to manipulate the hash values. 1. How to iterate over Hash elements The Ruby Hash class provides three differe...

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Ruby Enumerables: Hashes

The most famous framework based on Ruby language, Ruby on Rails, makes extensive use of hash. And cause in our blog we talk mainly about development with Ruby on Rails it seem fair to me to explore some language constructs that are widely used by the Rails framework. In this and in the next posts I will briefly present characteristics and properties of some of the most widely used constructs, starting from Ha...

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