Jelani Woods jelaniwoods

How to create a Ruby gem that adds Rake tasks

Create a gem

One way to do this is to use bundler to scaffold our gem:

bundler gem my_gem

Add rake tasks to our gem

I prefer to put tasks meant to manage the gem itself in lib/tasks, and tasks the gem is meant to provide to gem users in lib/my_gem/tasks.

Arel Cheatsheet on Steroids

A (more) complete cheatsheet for Arel, including NamedFunction functions, raw SQL and window functions.

Tables

posts = Arel::Table.new(:posts)
posts = Post.arel_table # ActiveRecord

Table alias

Cheat Sheets are greate but they are not a substitute for learning the framework and reading the documentation as we most certainly have not covered every potential example here. Please refer to the Rails Command Line Docs for more information.

Command Line Generator Info

Reference

You can get all of this information on the command line.

rails generate with no generator name will output a list of all available generators and some information about global options. rails generate GENERATOR --help will list the options that can be passed to the specified generator.

How to create small, unique tokens in Ruby

That is is basically a "fork" of blog article i'm constantly returning to. It seems that the blog is down:

My choice: Dave Bass’s rand().to_s() trick

Dave Bass proposed this which I picked up for my implementation (here for an 8-chars token):

	#####################
	#
	# Use this with or without the .gitattributes snippet with this Gist
	# create a fixle.sh file, paste this in and run it.
	# Why do you want this ? Because Git will see diffs between files shared between Linux and Windows due to differences in line ending handling ( Windows uses CRLF and Unix LF)
	# This Gist normalizes handling by forcing everything to use Unix style.
	#####################


	# Fix Line Endings - Force All Line Endings to LF and Not Windows Default CR or CRLF

	<!-- /app/views/admin/users/new_invitiations.html.erb -->

	<h2>Send invitation</h2>

	<%= form_for @user, :url => send_invitation_admin_users_path do \|f\| %>

	<table style='width: 50%'>
	<tr>
	<td><%= f.label :first_name %></td>
	<td><%= f.text_field :first_name %></td>