CJ Kihlbom cjse

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Title: Introduction Letterpress - the model factory for the lazy people.

Why yet another model factory gem?

In this blog post I will try to explain what my goals are for Letterpress.

No DSL

As a consultant I have worked on many different Rails projects and most of them use model factories to populate their models with default values. I love to use model factories when writing tests. But I have one concern: I have to learn yet another DSL to be able to populate my models with default values. That feels wrong to me.

	hash_field :body
	hash_field :type { self.class.to_s }
	hash_fields :body,
	:title,
	:version => "1.2.0",
	:type => -> { self.class.to_s }

	def self.hash_field (key, value=nil, &block)
	if block_given?
	value = block

	StringTemplater with no tokens
	- returns blank string if the given string is blank
	- returns a non-blank string unchanged

	StringTemplater with one token
	- replaces token with empty string if no value in context
	- replaces token with value from context
	- leaves the rest of the string unchanged

	StringTemplater with two tokens

	export PROJDIR="$HOME/Projects"

	p() {
	cd $PROJDIR/$1/
	}

	_projectcomplete() {
	COMPREPLY=($(compgen -W '$(`which ls` $PROJDIR/)' -- ${COMP_WORDS[COMP_CWORD]}))
	return 0
	}

	path = "/Users/cj/Desktop/prisma.csv"
	require 'csv'
	CSV.open(path, 'r') do \|row\|
	if @headers.nil?
	@headers = row.map(&:to_sym)
	else
	e = Employee.new
	attributes = Hash[*@headers.zip(row).flatten]
	@headers.each do \|header\|
	e.send "#{header}=", attributes[header]

	# by bryan helmkamp with slight modification by chris wanstrath
	# from http://www.brynary.com/2008/8/3/our-git-deployment-workflow

	module GitCommands
	extend self

	def diff_staging
	`git fetch`
	puts `git diff origin/production origin/staging`
	end

	def has_children?
	self.class.reflect_on_all_associations(:has_many).map { \|a\| !send(a.name).empty? }.any?
	end