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:12345678910111213141516171819202122232425...

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How to insert more Disqus comments box in a single page

Hello everyone! For those not familiar Disqus is a platform that allows you to easily insert a box for comments on any website and allows users to use the their Facebook or Twitter account (but not only) to authenticate. The limit of Disqus is that it associates any thread of comments to a unique url. Consequently, it will expect that in every page there is only a comment box. In most cases this limit is ac...

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Ruby on Rails and jQuery: multiselect with checkbox

Ruby on Rails and jQuery: multiselect with checkbox

Today I want to present a very convenient jQuery plugin I’ve used to create a combo box with checkboxes for a multi-selection field.Suppose we have a form of insertion / modification of user data, and that the user can have multiple functions. We start with rendering the form with a multi-selection field, where you can select more functions with the combination “<ctrl>...

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Different layout for the same controller

In some projects can happen that you have to use different graphic templates for different methods of the same controller. At first sight one would implement a solution that provides an explicit call to the desired layout within each action.Something like this:123456789101112131415161718192021class PostController < ApplicationController def index [...] :layout => 'standard' end def show [...] ...

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Rails Best Practices 5: Optimize Migration

Migrations, in my opinion, are one of the best things in Rails since these allow the creation and populating the database using ruby code without having to worry about which type of db run below. That said, even writing the migration is better to follow some best practices. 1. DB Index The first practice I strongly recommend is to define indices for the external keys and for all those columns...

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