TILs - Fueling Curiosity, One Insight at a Time

http://jsnice.org/ not a TIL, but lost and found it only today. This is a reverse tool that can be run on minified JS to get some more human readable ouput

You can scope relations like has_many, has_one and belongs_to. Eg: has_one :policy, -> { where active: true }

We can make use of ActiveRecord's unscoped method to accept a blocks, such that we can obtain associations bypassing the default scope on the associations.

mock moment using jest http://www.bambielli.com/til/2018-01-07-mocking-constructors/

We can make use of Set instead of an Array in Ruby when we would like to create sequences without duplicates and also can be used to compare two sets disregarding order as compared to array for which order of elements matter.

ActiveModel Boolean type inlcudes rules for coersion to handle user input appropriately. We can make use of this when ever we would need to do explicit type casting on user input. https://github.com/rails/rails/blob/47eadb68bfcae1641b019e07e051aa39420685fb/activemodel/lib/active_model/type/boolean.rb

active support has an unordered map like structure https://apidock.com/rails/ActiveSupport/OrderedHash, but it is actually called ordered hash (shrug)

Multiple ways to read files in golang explained - http://kgrz.io/reading-files-in-go-an-overview.html

When using docker-compose and when in doubt that containers are getting cached, pass --build option. Works like charm

chrome://net-internals

use chrome(v65 and above) local overrides to modify a webpage's assets and store on your local which will be loaded everytime you open the website - https://www.youtube.com/watch?v=UOn0b5kn3jk

If you have a dimple, it's a muscle atrophy - basically your muscle doesn't work

Use AbortController to cancel the promise.
/code
const controller = new AbortController();
const signal = controller.signal;
// pass this signal as option in your fetch request
fetch(url, {signal}).then(...).catch(...)

// now you can reject the above promise by calling abort like this
signal.abort()

//promise will get rejected with error "AbortError"

preloading data for custom sql,
profiles = Profile.find_by_sql(sql_query)
ActiveRecord::Associations::Preloader.new.preload(profiles, :user)

Some more stuff here http://cha1tanya.com/2013/10/26/preload-associations-with-find-by-sql.html

rendering templates outside of controller "SomeController.render :index, formats: :csv, locals: { users: users }"

We can specify integrity and crossorigin on link and script tags. More here https://hacks.mozilla.org/2015/09/subresource-integrity-in-firefox-43/

https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/hidden Looks like this attribute can be used to preload content, or am I wrong?

a sample/template rspec spec to test concurrent api calls. https://gist.github.com/goromlagche/835bd371d5e4825580e8c9e4430c7ea2

Never Wrap a component with HOC inside the render method. This will cause numerous unmount and mount of same component on each render.

Vim tip - Hitting g Ctrl-g will show you some tech info about the current file, like number of words or how many bytes it has
-- Col 1 of 25; Line 184 of 184; Word 471 of 472; Byte 4266 of 4291