ryanb

My issues with Modules

In researching topics for RailsCasts I often read code in Rails and other gems. This is a great exercise to do. Not only will you pick up some coding tips, but it can help you better understand what makes code readable.

A common practice to organize code in gems is to divide it into modules. When this is done extensively I find it becomes very difficult to read. Before I explain further, a quick detour on instance_eval.

You can find instance_eval used in many DSLs: from routes to state machines. Here's an example from Thinking Sphinx.

class Article < ActiveRecord::Base

dhh

class Ticket < ActiveRecord::Base
  belongs_to :grouper
  belongs_to :user

  validate :user_cant_be_blacklisted, on: :confirmation
  validate :user_cant_double_book, on: :confirmation

  validate :grouper_cant_be_full, on: :confirmation
  validate :grouper_cant_have_occurred, on: :confirmation

manigandand

package main

import (
	"fmt"
	"reflect"
	"strings"
	"unsafe"
)

func main() {

matthewrudy

# frozen_string_literal: true
namespace :db do
  namespace :structure do

    STRUCTURE_PATH = 'db/structure.sql'

    def clean_structure_file
      original = File.read(STRUCTURE_PATH)
      cleaned = original.dup

cheeaun

RedDotRubyConf 2016 links & resources

📆 Jun 23-24, 2016

🌏 Web site: http://reddotrubyconf.com/ Twitter: http://twitter.com/reddotrubyconf

💁 Ping me @cheeaun on Twitter or leave a comment below if you found some awesome stuff for #rdrc2016. This gist will be updated whenever there's new stuff.

🕙 Previously, on RedDotRubyConf...

cheeaun

RedDotRubyConf 2015 links & resources

📆 June 4-5, 2015

🌏 Web site: http://reddotrubyconf.com/ Twitter: http://twitter.com/reddotrubyconf

💁 Ping me @cheeaun on Twitter if you found some awesome stuff for #rdrc2015. This gist will be updated whenever there's new stuff.

🕙 Previously, on RedDotRubyConf...

tenderlove

require 'fiddle'

module Python
  def __class__= k
    value = _wrap self
    [k.object_id<<1].pack('Q').unpack('C8').each_with_index {|n,i|value[i+8]=n}
  end
  def _wrap klass; Fiddle::Pointer.new Fiddle.dlwrap klass; end
end

satran

# Packages and modules are imported to the scope using the import statement.
# If you wanted just a particular object from a module/package you can use
# the from <module> import <object>
import sys
import requests

# There are no constants in Python, still we can use a naming convention to
# imply that to the user of a library.
BASE_URL = "https://api.github.com"

prathamesh-sonpatki

;; 1.1.1 Lisp atoms
;; If a list is preceded by single quote, we are telling lisp interpreter to take it as it is
'(sachin
  rahul
  saurav
  laxman)
;; If a list is not preceded by single quote, lisp interpreter treats first atom of the list as a function,
;; and passes all the remaining atoms as arguments to it, and returns result of the function
(+ 2 2)
'(this list has (list inside it))

prathamesh-sonpatki

class Email < ActiveRecord::Base

  scope :by_account, -> account_id { where(account_id: account_id) }

  attr_accessible :template_name, :subject, :content, :user_id, :account_id

  validates  :subject,       presence: true
  validates  :template_name, presence: true
  validates  :template_name, uniqueness: { :scope => :account_id }
  validates  :content,       presence: true