A Technical Note
Here I’m writing how to access Linux server with private key. This is really helpful when you setup remote server first time. For example while creating new instance to the ec2 server, it will allow you to download the private key. You can access to …
Read MorePostgreSQL PostgreSQL, often simply Postgres, is an object-relational database management system with an emphasis on extensibility and standards compliance. This post is the collection of most commonly used PostgreSQL commands. Login to PostgreSQL psql -Upostgres Where postgres is PostgreSQL username. It will ask password of …
Read MoreRuby gems are the ruby third-party libraries that are created for special purpose. For example, in web application if I want to display large number (>500) of data in a single page, I have to use pagination. For this we have special library build in …
Read MoreSince ActiveAdmin uses Ransack for search, we can use Ransack to grab filter collection using their params. This is old method but it works fine to my Rails 5.0.0 and ActiveAdmin 2.0.0 version. ModelName.ransack(params[:q]).result Here is an example controller do def index if params[:q].present? && …
Read MoreThe software utility cron is a time-based job scheduler in Unix-like computer operating systems. We can schedule cron job to run specific job in a particular date/time. For ruby we have whenever gem to run those cron job. These are the processes to run whenever …
Read MoreIn my User model, I have to check validation presence of state only for users from Nepal. No need to check validation for the users from other country. For this I have implemented as follows: class User < ActiveRecord::Base validates_presence_of :state, :if => :in_nepal? private …
Read MoreRubyConfIndia (http://rubyconfindia.org) is a global event complementing other RubyConf events across the world. This is India edition of ruby conference. This year RubyConfIndia was happened in Bangluru on 9th and 10th Feb 2018. I got chance to attain this event. The event was started with …
Read MoreSometimes we have to take backup and restore our database. In this post I’m describing how to take backup from MySQL database and restore to Linux/Unix machine. If phpMyAdmin is installed to your system, you can take backup from web portal. If not installed you …
Read MoreWhat is Gemset? A Gemset is just a container you can use to keep gems separate from each other. We create separate gemset for different project which only have required gem with version for the particular project. It is a separate directory with version of …
Read MorePaperclip is intended as an easy file attachment library for Active Record. Paperclip is ruby gem which helps to upload image or attachment in rails application. We can upload attachment using paperclip gem in rails through following steps. Add paperclip gem to your Gemfile gem …
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