Consider the following relation where poll is having many options and each option of the poll must be having a unique description,. Now, when trying to create a poll with its options using nested attributes, uniqueness validation is not getting applied due to race condition. Why it is occurring? Is it a bug? .

Learning shall never stop! Ruby, Javascript and fun. Using Null Object Pattern in Rails to improve code quality. The last lecture by Randy Pausch. Using Service Classes to improve code-quality. Whats new in Rails 5? At a happy place. Blocks, Procs and Lambdas revisited. My New Year Resolutions in November. Blocking unsupported requests on nginx. Rumbling at RailsRumble, 2014. Excel Report using axlsx gem.

With ever-increasing amount of data, both in terms of quantity as well as quality, what we need is a precise and accurate way to represent it for better comprehension and facilitate decision making. D3 stands for Data Driven Document, i. when your web-page is interacting with data. Data can be as simple a simple array of integers or can be as complex as something else.