Posts Tagged ‘rails’

search plugin for rails

July 10th, 2008 •
tags: , , 

# USAGE EXAMPLE
# -----------------------------------------------------------
# class PostsController < ApplicationController
#   restful_search do |s|
#     s.model = :foo
#     s.search_param_name = "search" # defaults to 'match'
#     s.columns = [ 'foo.name', 'bar.state', 'baz.comment' ],
#     s.joins = [ :foo => { :bar => :baz } ],
#   end
#
#   def index
#     @posts = restful_search_results
#   end
# end
# -----------------------------------------------------------

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integer range collection_select form helper

July 9th, 2008 •
tags: , 

<%= f.collection_select :priority, (1..5), :to_i, :to_i %>

calling named_scope in a loop doesn’t seem to work in rails 2.1.0 ?

June 20th, 2008 •
tags: , 

#  # Raises NoMethodError: undefined method `processing'
#  %(pending processing complete error).each do |s|
#    named_scope s.to_sym,
#      :conditions => ["state = ?", s],
#      :order => "priority, created_at"
#  end

named_scope :pending,
:conditions => "state = 'pending'",
:order => "priority, created_at"

named_scope :processing,
:conditions => "state = 'processing'",
:order => "priority, created_at"

named_scope :complete,
:conditions => "state = 'complete'",
:order => "priority, created_at"

named_scope :errorneous,
:conditions => "state = 'error'",
:order => "priority, created_at"

capistrano, thin, remote_cache, safe credentials and symlinked vendor/rails

June 12th, 2008 •
tags: , 

set :application, "coolapp"
set :repository,  "http://snusnu.info/svn/#{coolapp}/trunk/coolapp"

set :deploy_via, :remote_cache
set :deploy_to, "/u/apps/coolapp"

role :app,  "snusnu.info", :primary => true

# rely on ssh-agent or the likes to serve our private key on authentication
ssh_options[:port] = 22
ssh_options[:username] = 'coolio'
ssh_options[:host_key] = "ssh-rsa"
ssh_options[:auth_methods] = %w(publickey)

# workaround for capistrano-2.3 bug
ssh_options[:keys] = %w(~/.ssh/id_dsa.snusnu.info ~/.ssh/id_rsa.snusnu.info)

# taken from Advanced Rails Recipes
desc "Watch multiple log files at the same time"
  task :tail_log, :roles => :app do
  stream "tail -f #{shared_path}/log/production.log"
end

# call this if 'deploy_via :remote_cache' is set
# and you want to deploy a different tag or branch
# inspired from Jonathan Weiss' explanation of the issue
# http://blog.innerewut.de/2008/3/12/remote-cache-pitfalls
task :delete_remote_cache, :roles => :app do
  run "rm -rf #{shared_path}/cached-copy"
end

namespace :symlink do

  task :vendor_rails, :roles => :app do
    run "ln -s #{shared_path}/rails #{release_path}/vendor/rails"
  end

end

after "deploy:update_code", "symlink:vendor_rails"

namespace :thin do

  %w(start stop restart).each do |action|
    desc "#{action.to_s.capitalize} the application's thin server(s)"
    task action.to_sym, :roles => :app do
      run "thin #{action} -C #{deploy_to}/current/config/thin.yml"
    end
  end
end

namespace :deploy do

  # we don't need sudo for cleanup
  before("deploy:cleanup") do
    set :use_sudo, false
  end

  # taken from Advanced Rails Recipes
  desc "Runs after every successful deployment"
  task :after_default do
    cleanup
  end

  # taken from Advanced Rails Recipes
  task :copy_database_configuration do
    production_db_config = "#{deploy_to}/shared/production.database.yml"
    run "cp #{production_db_config} #{release_path}/config/database.yml"
  end

  after "deploy:update_code", "deploy:copy_database_configuration"

  %w(start stop restart).each do |action|
    desc "#{action.to_s.capitalize} the thin server(s)"
    task action.to_sym do
      find_and_execute_task("thin:#{action}")
    end
  end

end

aligned numbers aka zerofill

May 6th, 2008 •
tags: , , 

# zerofill(7,3) => "007"

def zerofill(value, digits = 9)

  "%0#{digits}d" % value.to_i

end

google analytics for rails production environment

April 25th, 2008 •
tags: , 

# assuming a partial located in views/shared
# that contains the google analytics script body
def render_google_analytics_script
  render :partial => "/shared/google_analytics" if Rails.env == "production"
end

# render from layouts
<%= render_google_analytics_script %>

paginated record numbers

April 23rd, 2008 •
tags: , 

# application_helper.rb
# record numbering inside paginated admin index views
def paginated_record_number(offset)
  # TODO find out will_paginate page_count query
  page = params[:page] ? params[:page].to_i : nil
  (page ? page - 1 : 0) * ( params[:per_page] || 30) + offset + 1
end

# use in views like so
<%= paginated_record_number(idx) %>

link_to_has_one

April 16th, 2008 •
tags: , 

# Creates 'Show AssociatedResource' or 'New AssociatedResource' links
# based on wether the specified has_one association exists or not.
# The optional options parameter is passed through to link_to as html_options.
# Since this helper relies on record identification, there is no way to pass
# all the other url_for options, as far as I can see
# ---------------------------------------------------------------------------
# Use in your views like so:
# <%= link_to_has_one @post, :comment %>
# <%= link_to_has_one @post, :comment, "What say you?" %>
# <%= link_to_has_one @post, :comment, "What say you?", :class => "oldskool" %>
def link_to_has_one(parent, has_one_association_name, options = {})
  has_one_association_name = has_one_association_name.to_s.underscore
  child = has_one_association_name.camelize
  child_path = "#{parent.class.to_s.underscore}_#{has_one_association_name}_path"
  if parent.send(has_one_association_name)
    name = options[:new_name] ? options[:new_name] : "Show #{child}"
    link_to name, self.send(child_path, parent), options
  else
    name = options[:existing_name] ? options[:existing_name] : "New #{child}"
    link_to name, self.send("new_#{child_path}", parent), options
  end
end

named_scope features and gotchas

April 16th, 2008 •
tags: , 

# Examples mostly taken from Ryan Daigle's blog.
# http://ryandaigle.com/articles/2008/3/24/what-s-new-in-edge-rails-has-finder-functionality
# this shall serve as a reminder for me!

# WORKS but actually breaks coding conventions
# well, at least in most cases if you respect print margins ;)
# (multiline blocks/lambdas(?) are supposed to be enclosed in do/end

named_scope :created_by_account, lambda { |account|
  { :conditions => [ "created_by = ?", account.id ] }
}

# DOES NOT WORK
# ArgumentError: tried to create Proc object without a block
# Most probably this is due to the way that named_scope extensions can be defined

named_scope :created_by_account, lambda do |account|
  { :conditions => [ "created_by = ?", account.id ] }
end

# named_scope extensions
# I guess because of the way do/end is used here,
# it is not possible to use do/end with lambda

named_scope :inactive, :conditions => {:active => false} do
  def activate
    each { |i| i.update_attribute(:active, true) }
  end
end

# original comment by Pratik Naik on March 27, 2008 @ 08:56 PM

named_scope :recent, :conditions => ['created_at > ?', 1.week.ago]

# That is really a bad example. As the conditions gets evaluated at load time,
# it’ll end up giving you inaccurate results in production
# where models get loaded only once.

# "Correct" way would be :

named_scope :recent, lambda {
  { :conditions => ['created_at > ?', 1.minute.ago] }
}

# Store named scopes
active = User.scoped(:conditions => {:active => true})
recent = User.scoped(lambda { { :conditions => ['created_at > ?', 1.minute.ago] } })
recent_active = recent.active
recent_active.each { |u| ... }

# count and statistic methods

user.active.recent.count #=> 23
user.active.recent.sum(:age) #=> 391

watching activerecord

April 15th, 2008 •
tags: , 

# This greatly helps learning what ActiveRecord does!

# All credits go to Jamis Buck at
# http://weblog.jamisbuck.org/2007/1/31/more-on-watching-activerecord

# environment.rb
def log_to(stream)
  ActiveRecord::Base.logger = Logger.new(stream)
  ActiveRecord::Base.clear_active_connections!
end

# in irb or script/console or environment.rb
log_to(STDOUT)

# or create new streams
buffer = StringIO.new
log_to(buffer)
puts buffer.string

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