scope_do¶ ↑

named_scope utilities.

Description¶ ↑

scope_do is a tiny utilities to define useful named_scope. scope_do provides

• named_acl : enable User - Group - Target style access control list.

• chained_scope : enable defined named_scope method chain.

• has_children : define scope to load child records

Installation¶ ↑

Archive Installation¶ ↑

rake install

Gem Installation¶ ↑

gem install scope_do

Features/Problems¶ ↑

named_acl¶ ↑

named_acl provides Target.accessible_by(users) scope that load target model accessible by the user. And also provides User#accessible_#{target} methods which call Target.accessible_by(self).

class User < ActiveRecord::Base
  scope_do :named_acl
  named_acl :blogs
end

now you write below in controller.

class BlogsController < ApplicationCotnroller
  def index
    @blogs = current_user.accessible_blogs
    # or method chain
    # @blogs = current_user.accessible_blogs.find_by_keyword(params[:keyword])
  end
end

chained_scope¶ ↑

chained_scope provides named_scope macro that skip condition when all args are blank. and it enable named_scope method-chainable.

class Blog < ActiveRecord::Base
  scope_do :chained_scope
  named_scope :title_like, proc{|part|
    {:conditions => ["#{quoted_table_name}.title LIKE ?", "%#{part}%"]}
  }
  ...and more...

  chainable_scope :title_like
end

without chained_scope, you must write below (or reject blank in each scope)

def index # In some controller
  @blogs = Blog.some_scope
  @blogs = @blogs.title_like(params[:q]) unless params[:q].blank?
  @blogs = @blogs.month_in(params[:month]) unless params[:month].blank?
  ...
  @blogs = scope.find(:all, ...)
end

chained_scope enable below style

def index # In some controller
  @blogs = Blog.some_scope.
             title_like(params[:q]).
             month_in(params[:month]).
             find(:all, ...)
end

has_children¶ ↑

define scope that have children records.

class Blog < ActiveRecord::Base
  scope_do :has_children
  has_many :entries
  has_children :entries
end

add “has_entries” scope that have one or more entries.

Blog.has_entries.all?{|b| not b.entries.blank? }  # => true

“has_entires” also accept children numbers

Blog.has_entries(2).all?{|b| b.entries.size >= 2 }  # => true

Synopsis¶ ↑

see spec/*/_spec.rb

Copyright¶ ↑

Author

MOROHASHI Kyosuke <moronatural@>gmail.com

Copyright

Copyright © 2009 MOROHASHI Kyosuke

License

MIT