TILs - Fueling Curiosity, One Insight at a Time

when starting rails server with puma if you get error puma/launcher.rb:343:in stat': No such file or directory @ rb_file_s_stat - try to cd back to parent directory and then cd` to project folder again. There is chance that you moved your project to another directory and your shell is not updated with new path.

when starting rails server with puma if you get error puma/launcher.rb:343:in stat': No such file or directory @ rb_file_s_stat - try to cd back to parent directory and then cd` to project folder again. There is chance that you moved your project to another directory and your shell is not updated with new path.

Open file in vim with cursor in specific line. vim <file> +lineno Ed: vim abc.rb +343

The Forwardable module in Ruby provides delegation of specified methods to a designated object, using the methods def_delegator and def_delegators.

Ram talks with the computer with the help of a memory controller on the CPU. So the reason why its often suggested to prefer to have multiple RAM modules rather than a single one is due to memory channels. If the memory controller within the CPU supports multi-channel architecture then it can leverage it having multiple RAMs than having a single one as it helps in faster data exchange. Like if it’s dual channel then a pair, quad channel then four modules, etc.

to verify certs generated by letsencrypt, we can do openssl x509 -in server.crt -text -noout. More info here: https://support.asperasoft.com/hc/en-us/articles/216128468-OpenSSL-commands-to-check-and-verify-your-SSL-certificate-key-and-CSR

to verify certs generated by letsencrypt, we can do openssl x509 -in server.crt -text -noout. More info here: https://support.asperasoft.com/hc/en-us/articles/216128468-OpenSSL-commands-to-check-and-verify-your-SSL-certificate-key-and-CSR

Rspec has argument matchers any_args for matching any number of args at any point in an arg list and anything for matching anything and everything.

use flex: 1 on the child of flexbox element to expand the child to 100% width of the parent https://jsbin.com/dadidujubo/1

Capybara defaults to requiring an href attribute exist when finding links. To handle such cases we can pass href: nil as an option thus enabling to find it.

Rails has an ActiveSupport::Notifications module which is a part of its core instrumentation API. This API allows users to define hooks on events. With the ActiveSupport::Notifications you can instrument an event by simply calling instrument with a name, payload and a block. The notification will be sent after the block returns. Now all you need is to define subscribe method which consumes the event based on event name and you can define your on callback code here, sort of like a Pub/sub pattern.

related to GIT_SSH_COMMAND (http://codemancers.littil.io/?q=GIT_SSH_COMMAND) if you are using hub + multiple account. you can use HUB_CONFIG=~/.config/hub-work for setting config for work account. source: https://github.com/github/hub/issues/1300#issuecomment-318872894

you can pass options.args << ‘--headless’ to firefox newer versions, no need for headless gem \r
\r
options = Selenium::WebDriver::Firefox::Options.new\r
options.args << ‘--headless’\r
Capybara::Selenium::Driver.new(app,browser: :firefox, options: options)

To remove unwanted hex packages from mix.lock file, use mix deps.unlock --unused command

about https://stedolan.github.io/jq/ useful while tailing json logs, e.g tail -f /var/log/app.log | jq -r

You can switch between k8s contexts using the docker toolbar menu in OSX.

use Application.get_env(:your_app,:env) in prod instead of Mix.env. when you deploying to prod. https://gitlab.com/codemancers/diffity-vue/commit/076c54a418d988208627f61f206176744aefca30

React provides us with Portals which can be used to render children into a DOM node that exists outside the DOM hierarchy of the parent component

React provides us with Portals which can be used to render children into a DOM node that exists outside the DOM hierarchy of the parent component